一段有意思的代码

package ex01.pyrmont;

public class Son extends Father {
public void a(){
System.out.println("a from son");
super.a();
}

public void b(){
System.out.println("b from son");
}

public static void main(String[] args) {
Son son=new Son();
son.a();
}
}

package ex01.pyrmont;

public class Father {

public void a(){
System.out.println("a from father");
b();
}

public void b(){
System.out.println("b from father");
}
}

执行后会输出什么,为什么?

答案如下

a from son

a from father

b from son

如果把Son中的方法b去掉,会怎么样呢?

a from son

a from father

b from father