Sửa lỗi trong lập trình java cannot find symbol method năm 2024

The “Cannot find symbol” error in Java is a common issue that can often be resolved by understanding variable scopes, following naming conventions, and utilizing the features of an IDE. Writing clean and organized code also plays a crucial role in avoiding such errors.

The Cannot Find Symbol Error in Java error occurs when the Java compiler cannot find a symbol that you are trying to reference in your code. In this article, we will explore how to resolve the “Cannot Find Symbol” error in Java.

The “Cannot Find Symbol” error occurs when you are trying to reference a symbol that has not been defined or imported properly. Symbols can include variables, methods, and classes or in easy language when you try to reference an undeclared variable in your code. The error typically occurs when you have made a typo, used the wrong case in the symbol name, or when you are trying to reference a symbol that is out of scope. You may also encounter this error when you are using multiple files, and the compiler cannot find a class or package that you are trying to reference.

Common mistakes that lead to “Cannot Find Symbol” error in Java and resolving them, you can follow these steps:

• Typos
• Undeclared Variable
• Scope of Current block
• Import Statement

Typos

Make sure that the symbol you are trying to reference is spelled correctly and matches the case used in the definition.

Example 1:

Java

public class Main {

static int

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

0`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

2`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

8

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

9

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

2

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

8

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

8

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:1: error: cannot find symbol import java.util.Rand;

            ^  

symbol: class Rand location: package java.util ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
    ^  

symbol: class Rand location: class Main ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
                    ^  

symbol: class Rand location: class Main

1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:1: error: cannot find symbol import java.util.Rand;

            ^  

symbol: class Rand location: package java.util ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
    ^  

symbol: class Rand location: class Main ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
                    ^  

symbol: class Rand location: class Main

9`public`0`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

public static `public`9 `class`0

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int` `class`5`class`6`class`7`class`8`class`9

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`Main { `1

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

`Main { `4

Output:

./Main.java:17: error: cannot find symbol

    int value = large(20, 4);  
                ^  

symbol: method large(int,int) location: class Main

Explanation of the above program

We get this error as the function we initialized is Large(int a,int b) whereas we are calling large(a,b) so to resolve this typo mistake we just change large to Large.

Example 2:

Java

public class Main {

static int

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

0`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

2`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

8

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

9

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

2

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

8

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

8

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:1: error: cannot find symbol import java.util.Rand;

            ^  

symbol: class Rand location: package java.util ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
    ^  

symbol: class Rand location: class Main ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
                    ^  

symbol: class Rand location: class Main

1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

1

./Main.java:1: error: cannot find symbol import java.util.Rand;

            ^  

symbol: class Rand location: package java.util ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
    ^  

symbol: class Rand location: class Main ./Main.java:6: error: cannot find symbol

    Rand rand = new Rand();  
                    ^  

symbol: class Rand location: class Main

9`public`0`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

public static `public`9 `class`0

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

16`class`6`class`7`class`8`class`9

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`Main { `1

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

`Main { `4

Undeclared Variable

We can also get errors by undeclared Variables.

Example 1:

Java

public class Main {

public static `public`9

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

33

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

38

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

39`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

43

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

44`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

47

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

49

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

`Main { `4

Output:

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

Explanation of the program

In the above example, the “Cannot find symbol” error occurs as we have not declared the sum. The corrected code is given below (will occur because “sum” is not declared. In order to solve the error, we need to define “int sum = n1+n2” before using the variable sum.

Example 2:

Java

public class Main {

public static `public`9

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

33

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

38

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

39`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

43

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

44`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

47

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

49

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

`Main { `4

Check the scope

Make sure that the symbol you are trying to reference is within the scope of the current code block.

Example 1:

Java

public class Main {

public static `public`9

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

33

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

6

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7`int`

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

93

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

94`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

8

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

98

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

99

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

00

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

0`int`

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

03

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

04`public`1

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

./Main.java:6: error: cannot find symbol

    sum = n1 + n2;  
    ^  

symbol: variable sum location: class Main ./Main.java:7: error: cannot find symbol

    System.out.println(sum);  
                       ^  

symbol: variable sum location: class Main

7

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

09

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

4

`Main { `4

Output:

./Main.java:8: error: cannot find symbol

            System.out.println(y);  
                               ^  

symbol: variable y location: class Main

Explanation of the above program

In this program, we define an integer variable x and initialize it to 5. We then have an if statement that checks if x is greater than 0. If it is, we define another integer variable y, and initialize it to 10. However, y is only within the scope of the if block, and cannot be accessed outside of it.