class Cleanser{
private String s = "Cleanser";
public void append(String a){s+=a;}
public void dilute(){append("dilute()");}
public void apply(){append("apply()");}
public void scrub(){append("scrub()");}
public String toString(){return s;}
public static void main(String[] args){
Cleanser x = new Cleanser();
x.dilute();
x.apply();
x.scrub();
System.out.println(x);
}
}
public class Detergent extends Cleanser{
public void scrub(){
append("Detergent.scrub()");
super.scrub();
}
public void foam(){append("foam()");}
public static void main(String[] args){
Detergent x = new Detergent();
x.dilute();
x.apply();
x.scrub();
x.foam();
System.out.println(x);
System.out.println("Testing base class");
Cleanser.main(args);
}
}
//请问他的打印顺序怎么来的--~能讲解下么？
------解决方案--------------------