使用以下代码实现从键盘上接收一个选手的联系方式 给他加分 package t8; import java.util.ArrayList; import java.util.Iterator; import t5.Player; public class ArrayListDemo { public static void main(String[] args) { ArrayList<Player> players = new ArrayList<Player>(); players.add(new Player("曾佳欣", "信息与通信", "22-1", "111")); players.add(new Player("罗曼君", "信息与通信", "22-1", "222")); players.add(new Player("张嘉颖", "信息与通信", "22-1", "333")); players.add(new Player("吴少景", "信息与通信", "22-1", "444")); System.out.println("联系方式\t姓名\t班级\t系部\t得分"); for (Player player : players) { System.out.println(player.getContact() + "\t" + player.getName() + "\t" + player.getCls() + "\t" + player.getAcademy() + "\t" + player.getScore()); } } }

可以使用如下代码实现从键盘上接收一个选手的联系方式，并给他加分：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;
import t5.Player;

public class ArrayListDemo {

    public static void main(String[] args) {
        ArrayList<Player> players = new ArrayList<Player>();
        players.add(new Player("曾佳欣", "信息与通信", "22-1", "111"));
        players.add(new Player("罗曼君", "信息与通信", "22-1", "222"));
        players.add(new Player("张嘉颖", "信息与通信", "22-1", "333"));
        players.add(new Player("吴少景", "信息与通信", "22-1", "444"));
        
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要加分的选手的联系方式：");
        String contact = scanner.next();
        System.out.print("请输入要加的分数：");
        int score = scanner.nextInt();
        
        Iterator<Player> iter = players.iterator();
        while (iter.hasNext()) {
            Player player = iter.next();
            if (player.getContact().equals(contact)) {
                player.setScore(player.getScore() + score);
                break;
            }
        }
        
        System.out.println("联系方式\t姓名\t班级\t系部\t得分");
        for (Player player : players) {
            System.out.println(player.getContact() + "\t" + player.getName() + "\t" + 
                    player.getCls() + "\t" + player.getAcademy() + "\t" + player.getScore());
        }
        
        scanner.close();
    }

}

这段代码与上一题的代码类似，只是将查找选手的条件变成了联系方式，即使用`player.getContact().equals(contact)`进行匹配。