What are the causes of 'cannot find symbol' errors in Java?

Mainly occurs when we try to reference a variable that is not declared in the program we are compiling "Symbol not found" error, which means The compiler has no idea what variables we are referencing.

Some possible reasons why "symbol not found" occurs include:

• Using an undeclared variable or using it outside the code.
• uses incorrect capitalization ("tutorials" and "Tutorials" are different) or is misspelled.
• The import statement is not used correctly to reference the packaged class.
• Use of incorrect identifier values ​​such as letters, numbers, underscore and dollar sign. hello-class is different from helloclass.

Example

public class CannotFindSymbolTest {
   public static void main(String[] args) {
      int n1 = 10;
      int n2 = 20;
      sum = n1 + n2;
      System.out.println(sum);
   }
}

Output

CannotFindSymbolTest.java:5: error: <strong>cannot find symbol
</strong>sum = n1 + n2;
^
symbol: variable sum
location: class CannotFindSymbolTest
CannotFindSymbolTest.java:7: error: <strong>cannot find symbol</strong>
System.out.println(sum);
^
symbol: variable sum
location: class CannotFindSymbolTest

In the above program, "Find Symbol not found" error because " sum" was not declared. To solve this error, we need to define "int sum = n1 n2" before using the variable sum.

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