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();
}
}