import java.util.ArrayList; import java.util.Random; import java.util.Scanner; public class LuckyAudience { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ArrayList<String> audienceList = new ArrayList<String>(); System.out.println("请输入3名观众的姓名："); for (int i = 0; i < 3; i++) { String name = scanner.next(); audienceList.add(name); } System.out.println("观众姓名总览："); for (String name : audienceList) { System.out.println(name); } Random random = new Random(); int luckyIndex = random.nextInt(3); String luckyAudience = audienceList.get(luckyIndex); System.out.println("幸运观众是：" + luckyAudience); } }import java.util.ArrayList; import java.util.Random; import java.util.Scanner; public class LuckyAudience { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ArrayList<String> audienceList = new ArrayList<String>(); System.out.println("请输入3名观众的姓名："); for (int i = 0; i < 3; i++) { String name = scanner.next(); audienceList.add(name); } System.out.println("观众姓名总览："); for (String name : audienceList) { System.out.println(name); } Random random = new Random(); int luckyIndex = random.nextInt(3); String luckyAudience = audienceList.get(luckyIndex); System.out.println("幸运观众是：" + luckyAudience); } }

这是一个 Java 程序，用于从输入的观众姓名中随机选出一位幸运观众。程序首先创建一个 Scanner 对象，然后通过 for 循环输入 3 名观众的姓名，并将它们添加到 ArrayList 中。接着，程序使用 for-each 循环输出观众姓名总览。最后，程序使用 Random 类生成一个随机数，选出幸运观众，并输出其姓名。