implements_Keyword

ゞ浴缸里的玫瑰 2021-11-05 22:04 162阅读 0赞

## 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.

implements_Keyword

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