How to Resolve 'Parse Anonymous Class Does Not Implement Abstract Method' Error in Java?

What does the error 'parse anonymous class does not implement abstract method' mean in Java?

The error 'parse anonymous class does not implement abstract method' typically occurs in Java when an anonymous inner class is declared but fails to implement all the abstract methods from its superclass or interface. This error indicates that the compiler expects certain methods to be defined but doesn't find them in the anonymous class implementation.

// Example of an abstract interface with an abstract method
interface MyInterface {
    void myMethod();
}

// Correct implementation using an anonymous class
MyInterface obj = new MyInterface() {
    @Override
    public void myMethod() {
        System.out.println("Implemented myMethod!");
    }
};

Causes

• The anonymous class was created to implement an abstract class or interface which has one or more unimplemented methods.
• The method signature in the anonymous class does not match the method signature in the abstract class or interface.

Solutions

• Identify all abstract methods in the parent class or interface that the anonymous class is expected to implement.
• Ensure that your anonymous class implements all necessary methods, paying special attention to method signatures and return types.
• If the methods require certain parameters, ensure to include them in your implementation.

Mistake: Forgetting to implement all methods defined in the parent class or interface.

Solution: Always review any abstract methods or interface requirements you need to implement in your anonymous class.

Mistake: Incorrectly matching the method signature (like return type or method name).

Solution: Double-check that you follow the exact method signature as defined by the abstract class or interface.