java 接口interface

//抽象类方法对比
abstract class demo4_1{
    public abstract void run();
    public abstract String name();
}

interface demo4_1{
    void run();
    String getName();
}

interface demo4_1{
    void run();
    String getName();
}
interface demo4_1chou{
    void run();
    String name();
}
 //class实现interface需要使用implements关键字
class demo4_1_1 implements demo4_1{
    private String name;
    public demo4_1_1(String name){//构造方法
        this.name=name;
    }
    @Override    //继承
    public void run() {//父类中的方法
        System.out.println(this.name+" 1");
    }
    @Override
    public String getName() {//父类中的字段
        // TODO Auto-generated method stub
        return this.name;
    }
}

class demo4_1_2 implements demo4_1,demo4_1chou{
    protected String name;
    @Override
    public void run() {}
    @Override
    public String getName() {
        return this.name;}
    @Override
    public String name() {
        return this.name;}
}

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{tabs-pane label="术语"}

//接口继承 extends
interface demo4_1_3 extends demo4_1{
    void run();
    String getName();
}

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demo4_1 d=new demo4_1_4("我是默认方法");
        d.run();

interface demo4_1{
    //void run();
    String getName();
     default void run(){System.out.println(this.getName()+" run");}
}

class demo4_1_4 implements demo4_1{
    private String name;
    public demo4_1_4(String name) {
        this.name = name;
    }
    public String getName() {
        return this.name;
    }
}

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