final variables in Java - GeeksforGeeks

In Java, when final keyword is used with a variable of primitive data types (int, float, .. etc), value of the variable cannot be changed.

For example following program gives error because i is final.

public class Test { 
    public static void main(String args[]) { 
        final int i = 10; 
        i = 30; // Error because i is final. 
    } 
} 

When final is used with non-primitive variables (Note that non-primitive variables are always references to objects in Java), the members of the referred object can be changed. final for non-primitive variables just mean that they cannot be changed to refer to any other object

class Test1 { 
   int i = 10; 
} 
  
public class Test2 { 
    public static void main(String args[]) { 
      final Test1 t1 = new Test1(); 
      t1.i = 30;  // Works 
    } 
} 

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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