10.15习题2

package com.Hanqi2;

public class _1
{

public _1()
{

}
public String xingming;

public String renzhong;

public int age;

public _1(String xingming, String renzhong,int age)
{
System.out.println(xingming + "是一个" + renzhong + "," + age + "岁了");
}

//成长
public void chengzhang(int chengzhang)
{
age += chengzhang;
System.out.println(chengzhang + "年后他" + age + "岁了");

}

}

package com.Hanqi2;

public class _2 extends _1{

public _2(String xingming,String renzhong,int age)
{
super(xingming,renzhong,age);
}

public _2()
{

}

public void chengzhang(int grew)
{
age += grew;
System.out.println(grew + "yeas ago,he is " + age);

}
}

package com.Hanqi2;

public class _3 {

public static void main(String[] args) {
// TODO Auto-generated method stub

_1 body = new _1("mading","白种人",25);

body.age = 25;
body.chengzhang(9);

_1 b1 = new _2();

b1.age = 15;
b1.chengzhang(1);

}

}