繼承復習-發紅包案例

package ExtendsPractice;public class User {private String name;private int money;public User() {}public User(String name, int money) {this.name = name;this.money = money;}public void show() {System.out.println("我叫" + name + ",我有" + money + "元");}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getMoney() {return money;}public void setMoney(int money) {this.money = money;} } package ExtendsPractice;import java.util.ArrayList;public class Owner extends User {public Owner() {}public Owner(String name, int money) {super(name, money);}public ArrayList<Integer> send(int money, int num) {//首先需要一個集合，用來存儲若干個紅包的金額ArrayList<Integer> arrayList = new ArrayList<>();//首先看一下自己的余額int leftMoney = super.getMoney();if (leftMoney < money) {System.out.println("余額不足");return arrayList;}//把余數包給最后一個int avg = money / num;int mod = money % num;for (int i = 0; i < num - 1; i++) {arrayList.add(avg);}//最后一個紅包arrayList.add(avg + mod);System.out.println("群主總共發了" + money + "元");//System.out.println(arrayList);super.setMoney(leftMoney-money);return arrayList;} } package ExtendsPractice;import java.util.ArrayList; import java.util.Random;public class Normal extends User {public Normal() {}public Normal(String name, int money) {super(name, money);}public void receive(ArrayList<Integer> arrayList) {//從多個紅包當中隨便抽取一個，給自己//隨機獲取一個集合當中的索引編號int index = new Random().nextInt(arrayList.size());//根據索引，從集合當中刪除int delete = arrayList.remove(index);//當前成員本來自己有多少錢int money = super.getMoney();//加法，并且重新設置回去super.setMoney(delete + money);} } package ExtendsPractice;import java.util.ArrayList;public class RedPacket {public static void main(String[] args) {Owner owner = new Owner("群主",100);Normal normal1 = new Normal("成員A",10);Normal normal2 = new Normal("成員B",12);owner.show();normal1.show();normal2.show();System.out.println("=======");ArrayList<Integer> send = owner.send(11, 2);normal1.receive(send);normal2.receive(send);owner.show();normal1.show();normal2.show();} } //我叫群主,我有100元 //我叫成員A,我有10元 //我叫成員B,我有12元 //======= //群主總共發了11元 //我叫群主,我有100元 //我叫成員A,我有16元 //我叫成員B,我有17元

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