Local Inner Class in Java

Last Updated: 20 August, 2022

A Java class that is defined inside a block or method is known as a "local inner class" or "method local in class" in Java. The scope of the local inner class is inside the block or method only; it can’t be accessed from outside the block or method in which it is defined.

A local inner class cannot be declared as public, protected, private, or static, but it can be declared as final, abstract, and strictfp.

Syntax of Local Inner Class

  class outer_class_name {
    void method_name() {
      class local_inner_class_name {
        // variables
        // methods
      }
      // create object of local inner class
    }
  }

The local inner class can access the outer class properties such as fields and methods.

A method local inner class can extend an abstract class or implement an interface.

Example: Method Local Inner Class in Java

  class Outer {
    int maxNum = 100;
    static int totalNum = 100;
    void showNumber() {
      System.out.println("Outer class -> showNumber() method started....");
      int minNum = 50;
      
      // Defining the Local Inner Class
      class LocalInnerClass {
        int avgNum = 75;
        void displayNumber() {
          System.out.println("LocalInnerClass class -> displayNumber() method");
          System.out.println("minNum: " + minNum);
          System.out.println("maxNum: " + maxNum);
          System.out.println("avgNum: " + avgNum);
          System.out.println("totalNum: " + Outer.totalNum);
        }
      }
      // Creating an object of Local Inner Class
      LocalInnerClass local = new LocalInnerClass();
      local.displayNumber();
      System.out.println("Outer class -> showNumber() method ended....");
    }
  }
  
  public class MethodLocalInnerClassExample {
    public static void main(String[] args) {
      Outer out = new Outer();
      out.showNumber();
    }
  }

Outer class -> showNumber() method started....
LocalInnerClass class -> displayNumber() method
minNum: 50
maxNum: 100
avgNum: 75
totalNum: 100
Outer class -> showNumber() method ended....

When we compile the above Java program, after successful compilation, the compiler generates three .class files for the each classes. These files are named by the compiler as:

Local Inner Class in Java

Example: Method Local Inner Class in Java

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