继承语法含有main()方法

package me.ybleeho;

class Cleanser{        //清洁剂
    private String s="Cleanser";
    public void append(String a){s+=a;}
    public void dilute(){append("dilute");}        //稀释
    public void apply(){append("apply()");}        //应用
    public void scrub(){append("scrub()");}        //洗擦
    public String toSting(){return s;}
    public static void main(String[] args){
        Cleanser x=new Cleanser();
        x.dilute();x.apply();x.scrub();
        System.out.println(x.toSting());
    }
}

public class Detergent extends Cleanser{    //清洁剂
    public void scrub(){
        append("Detergent.scrub()");
        super.scrub(); //Call base-class version
    }
    //Add methods to the interface:
    public void foam(){append("foam()");}
    //Test the new class:
    public static void main(String[] args){
        Detergent x=new Detergent();
        x.dilute();x.apply();x.scrub();x.foam();
        System.out.println(x.toSting());
        System.out.println("Testing base class:");
        Cleanser.main(args);
    }
}

Cleanserdiluteapply()Detergent.scrub()scrub()foam()
Testing base class:
Cleanserdiluteapply()scrub()