Java-接口

 

 

/**
 * 测试接口的基本语法
 */
public class TestInterface {
    public static void main(String[] args) {
        Volant v = new Angel();
        v.fly();
//        v.helpOther();
        Honest h = new Angel();
        h.helpOthers();
    }
}
//飞行器接口
interface Volant {
    int FLY_HIGHT = 100;//默认有前缀public static final
    void fly();//默认有前缀public abstract
}
//善良接口
interface Honest {
    void helpOthers();
}
class Angel implements Volant,Honest {

    @Override
    public void fly() {
        System.out.println("我是天使，飞呀飞呀");
    }

    @Override
    public void helpOthers() {
        System.out.println("我是天使，喜欢扶老奶奶过马路");
    }
}

/**
 * 测试接口的多继承
 */
public class TestInterface2 implements C{
    @Override
    public void testA() {
        System.out.println("TestInterface2.testA");
    }

    @Override
    public void testB() {
        System.out.println("TestInterface2.testB");
    }

    @Override
    public void testC() {
        System.out.println("TestInterface2.testC");
    }

    public static void main(String[] args) {
        C c = new TestInterface2();
        c.testC();
        c.testA();
        c.testB();
        B b = new TestInterface2();
        b.testB();
    }
}
interface A {
    void testA();
}
interface B {
    void testB();
}
interface C extends A,B{
    void testC();
}