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implements Java Keyword with Examples

The implements keyword is used in a class declaration to indicate that the class being declared provides implementations for all methods declared in the interface whose name follows the implements keyword.

The following example illustrates a class implements an interface and provides a detailed implementation for the interface’s methods:

/** * This represents payment interface */interface Payment {    public void pay();}class CashPayment implements Payment {    // method overriding    @Override    public void pay() {        System.out.println("This is cash payment");    }}class CreditPayment implements Payment {    // method overriding    @Override    public void pay() {        System.out.println("This is credit card payment");    }}

Unlike extends keyword, a class can implement multiple interfaces. The interface names are separated by commas. For example:

interface A {}interface B {}class C implements A, B {}

Summary

• A single class may implement multiple interfaces.
• If the implemented class does not provide an implementation for the interface’s methods, the class must be abstract.

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