1.接口
package com.yfs.javase; public interface IDemo1 {//interface 接口 public /*abstract*/ void method1();//默认抽象方法 public } class Child1 implements IDemo1 { @Override public void method1() { // 实现接口的方法 System.out.println("call method1()"); } }
2.接口示例1
package com.yfs.javase; public interface IFly { public void fly(); }
3.实现接口
package com.yfs.javase; public class Bird implements IFly { @Override public void fly() { System.out.println("鸟在飞...."); } } class Wuya extends Bird { @Override public void fly() { System.out.println("乌鸦在飞...."); } } class Butterfly implements IFly { @Override public void fly() { System.out.println("蝴蝶在飞...."); } }
4.IRun接口
package com.yfs.javase; public interface IRun { int a = 10;//默认public static final public void run(); } /*public*/ interface ISwim { } class Horse implements IRun { @Override public void run() { System.out.println("马在跑..." + a); } }
5.接口多继承
package com.yfs.javase; //接口可以多继承 public interface ITest extends IFly, IRun, ISwim { }
6.Person
package com.yfs.javase; public class Person { private String name; private int age; private char sex; public Person() { } public Person(String name) { this.name = name; } public Person(String name, int age, char sex) { this.name = name; this.age = age; this.sex = sex; } public void introduce() { System.out.println("I am Person...."); } public String toString() { return "姓名:" + name + " 年龄 :" + age + " 性别:" + sex; } public void speak() { System.out.println(name + " 工作了吗?"); } public void sleep() { System.out.println(name + " 睡觉了吗?"); } public void eat() { System.out.println(name + " 吃了吗?"); } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public char getSex() { return sex; } public void setSex(char sex) { this.sex = sex; } }
7.超人 继承 人,实现 IRun,IFly 接口
package com.yfs.javase; public class SuperMan extends Person implements IRun, IFly { @Override public void run() { System.out.println("超人在跑...."); } @Override public void fly() { System.out.println("超人在飞..."); } }
8.接口 测试
package com.yfs.javase; public class Test1 { public static void main(String[] args) { IFly f1 = null; // new IFly();//接口不能实例化 f1 = new Bird(); f1.fly(); f1 = new Butterfly(); f1.fly(); callMethod(new Wuya()); IRun r1 = new Horse(); r1.run(); callMethod(new SuperMan()); } public static void callMethod(IFly f) { f.fly(); } }
9.测试2
package com.yfs.javase; public class Test2 { public static void main(String[] args) { SuperMan s1 = new SuperMan(); s1.setName("Tom"); s1.speak(); s1.run(); callMethod(new Horse()); callMethod(s1); } public static void callMethod(IRun r) { r.run(); } }
时间: 2024-10-12 19:48:05