Java0715/src/main/java/com/sf/javase/day08/duotai/Test10.java

package com.sf.javase.day08.duotai;

public class Test10 {
    public static void main(String[] args) {
        Base b = new Sub(); // 调用成员变量  编译看左边运行看左边
        System.out.println(b.x);
    }
}
class Base{
    int x = 1;
}
class Sub extends Base{
    int x = 2;
}