Java0715/src/main/java/com/sf/javase/day09/homework/Test07.java

package com.sf.javase.day09.homework;

public class Test07 {
    public static void main(String[] args) {
        Father f = new Son();
        System.out.println(f.x);
    }
}
class Father{
    int x = 10;
    public Father(){
        this.print();
        x = 20;
    }
    public void print(){
        System.out.println("Father.x = " + x);
    }
}
class Son extends Father{
    int x = 30;
    public Son(){
        this.print();
        x = 40;
    }
    public void print(){
        System.out.println("Son.x = " + x);
    }
}