import java.util.ArrayList; import java.util.List; import java.util.Random; public class Test1{ public static voidmain(String[] args){ List awardList = new ArrayList(); Award award1 = new Award(); award1.setAwardName("手机");//10% award1.setProbability(0.1); awardList.add(award1); Award award2 = new Award(); award2.setAwardName("水杯");//20% award2.setPorbability(0.2+0.1);//概率加上上一个奖品的概率（累加） awardList.add(award2); Award award4 = new Award(); award4.setAwardName("鼠标");//10% award4.setPorbability(0.1+0.2+0.1); awardList.add(award4); Award award5 = new Award(); award5.setAwardName("谢谢惠顾");//60% award5.setPorbability(1); awardList.add(award5); Random random = new Random(); int a = 0,b = 0,c = 0,d = 0; for (int i = 0; i < 10000; ) { Double userSelect = random.nextDouble();//0.0-1.0的double随机数(不包括1.0) String awardName = duageAward(userSelect, awardList); if ("手机".equals(awardName)) { a++; } else if ("水杯".equals(awardName)) { b++; } else if ("鼠标".equals(awardName)) { c++; } else if ("谢谢惠顾".equals(awardName)) { d++; } } System.out.println("手机"+ a +"次"); System.out.println("水杯"+ b +"次"); System.out.println("鼠标"+ c +"次"); System.out.println("谢谢惠顾"+ d +"次"); } } 这个代码的错误在哪

声明一个 Student 类，属性包括姓名、学号、总成绩；生成 10 个 Student 类对象,并放在一个一维数组中,编写方法按总成绩进行排序,将排序后的对象分别保持在Vector 、ArrayList、 HashTable类型的对象中,并遍历显示其中元素的信息。程序设计参考框架如下： import java,util.Vector; import java.util.ArrayList; import java.util.Hashtable; import java.util.Enumeration; import java.util.Iterator; public class Ex71 { public static void main (String[] args){

public static void main (String[] args){ Student[] students = new Student[10]; students[0] = new Student("Tom", 1001, 80); students[1] = new Student("Jerry", 1002, 90); students[2] = new Student...

package module4; import java.util.ArrayList; import java.util.Scanner; public class Test40 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); ArrayList<Shape> list = new ArrayList<>(); … }

这段代码看起来像是Java语言中创建一个Test40类的程序，其中包含一个main方法，该方法利用Scanner类和ArrayList类实现对形状类Shape的动态数组进行输入和操作。您需要补充代码以实现完整的功能。如果您有任何具体的...

1.完善下列代码用两种方法遍历list集合 import java.util.ArrayList; import java.util.Iterator; import java.util.List; public class AccessingList { public static void main(String[] args) { List<String> list = new ArrayList<String> (); list.add("A"); list.add("B"); list.add("C"); // 第一种遍历方法:forEach循环遍历 // 第二种遍历方法：迭代器遍历 } }

for (String s : list) { System.out.println(s); } 第二种遍历方法：迭代器遍历 Iterator<String> iterator = list.iterator(); while (iterator.hasNext()) { String s = iterator.next(); System.out...

import java.util.ArrayList; import java.util.Collections; import java.util.Scanner; import java.util.Hashtable; public class Main{ public static void main(String[] args){ Scanner sc = new Scanner(System.in); int n = sc.nextInt(); Set set = new LinkedHashSet(); String a; String b = sc.nextLine(); for(int i =0 ;i <n;i++){ set.add(sc.nextLine()); } System.out.println(set.size()); for(Object obj:set){ System.out.println(obj); } sc.close(); } }

1. 导入需要使用的包，包括java.util.Scanner、java.util.Set和java.util.LinkedHashSet。 2. 创建一个Scanner对象sc，用于从标准输入中读取数据。 3. 从标准输入中读取一个整数n，表示接下来要读取的...

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...

package com.DLNU.lz; import java.io.IOException; import java.util.ArrayList; import java.util.List; import com.DLNU.impl.Parkimpl; public class Test { private static List parkimpl; public static void main(String[] args) throws IOException { setParkimpl(new ArrayList<com.DLNU.impl.Parkimpl>()); Parkimpl s = new Parkimpl(); String[] x = s.Query(3); for(int i=0;i<5;i++) { System.out.println(x[i]); } } public static List getParkimpl() { return parkimpl; } public static void setParkimpl(List parkimpl) { Test.parkimpl = parkimpl; } }这段代码是用来干嘛的

这段代码是一个 Java 程序，它包含了一个 main 方法，这意味着它可以独立运行。在 main 方法中，程序会创建一个 Parkimpl 类的实例，并调用该实例的 Query 方法。Query 方法返回一个字符串数组，然后使用 for 循环将...

解释这段代码package question7; import java.io.DataOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashSet; import java.util.Scanner; import java.util.Set; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.Random; public class Test { public static void main(String args[]){ Test test=new Test(); Scanner input=new Scanner(System.in); String s1=new String(); s1=input.nextLine(); String[] s2 = s1.split(" "); int[] l=new int[s2.length]; for(int i=0 ; i<s2.length;i++){ l[i]=Integer.parseInt(s2[i]); } test.write("test.txt", l); int[] readlist=test.read("test.txt",l); isPrime isprime=new isPrime(readlist); for(int i=1;i<=10;i++){ new Thread(isprime).start(); } try { Thread.sleep(1000); //1000 毫秒，也就是1秒. } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } Set<Integer> set=new HashSet(); set=isprime.getSet(); System.out.println("素数set"+set); System.out.println("输入查询数字"); int num=input.nextInt(); if(set.contains(num)){ System.out.println(num+"是素数"); } else System.out.println(num+"不是是素数"); } public void write(String filename,int a[]){ File file = new File(filename); try { PrintWriter output=new PrintWriter(file); for(int i=0;i<a.length;i++){ output.print(a[i]+" "); } output.close(); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public int[] read(String filename,int a[]){ File file=new File(filename); try { Scanner input=new Scanner(file); int i=0; while(input.hasNext()){ a[i]=input.nextInt(); i++; } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } return a; } }

这段代码是一个 Java 程序，主要功能是读取用户输入的一串整数，将其写入文件 test.txt，然后又从这个文件中读取整数列表，并查找出其中的素数并存储在一个 HashSet 中，最后判断用户输入的数字是否为素数。...

import java.util.*; import java.util.Collections; public class Test01 { public static void main(String[] args) { Scanner scanner=new Scanner(System.in); List<Integer> list=new ArrayList<>(); for(int i=0;i<list.size();i++) list.add(scanner.nextInt()); Collection.sort(list); } }

public static void main(String[] args) { Scanner scanner = new Scanner(System.in); List<Integer> list = new ArrayList(); for (int i = 0; i < list.size(); i++) list.add(scanner.nextInt()); ...

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Arrays; import java.util.Collection; import java.util.Collections; import java.util.LinkedList; import java.util.List; import java.util.Scanner; public class Main{ public static void main(String[] args) throws IOException { BufferedReader in=new BufferedReader(new InputStreamReader(System.in)); int n; double need; double sum=0; String s[]=in.readLine().split(" "); n=Integer.parseInt(s[0]); need=Double.parseDouble(s[1]); String amount[]=in.readLine().split(" "); String price[]=in.readLine().split(" "); ArrayList<Mooncake> cakes=new ArrayList<Mooncake>(); for(int i=0;i<n;i++){ Mooncake cake=new Mooncake(); cake.setAmount(Double.parseDouble(amount[i])); cake.setSales(Double.parseDouble(price[i])); cake.setValues(Double.parseDouble(price[i])/Double.parseDouble(amount[i])); cakes.add(cake); } Collections.sort(cakes); for(Mooncake c: cakes){ if(need>=c.amount){ need=need-c.amount; sum+=c.amountc.values; } else{ sum+=needc.values; need=0; } if(need==0){ break; } } System.out.printf("%.2f",sum); } static class Mooncake implements Comparable<Mooncake>{ double amount; double sales; double values; public double getAmount() { return amount; } public void setAmount(double amount) { this.amount = amount; } public double getSales() { return sales; } public void setSales(double sales) { this.sales = sales; } public double getValues() { return values; } public void setValues(double values) { this.values = values; } @Override public int compareTo(Mooncake arg0) { // TODO Auto-generated method stub return this.values>arg0.values?-1:1; } } }转c++

把Java代码转换成C++代码如下： #include #include #include using namespace std; struct Mooncake { double amount; double sales; double values; bool operator<(const Mooncake& c) const { return ...

vscode报错需要 class、interface、enum 或 record import java.util.ArrayList; 需要 class、interface、enum 或 record import java.util.ArrayList;

public static void main(String[] args) { ArrayList<String> list = new ArrayList(); // ... } } 如果是在接口或枚举(enum)中使用，应该在相应的位置声明。而对于记录(record)这个Java 14及以上版本...

Duplicated Numbers 分数 10 作者翁恺单位浙江大学 This program reads a lot of integers, in which may be duplicated numbers. The program picks out all the duplicated ones and sorts the remainders in a descendent order. 函数接口定义： public static ArrayList<Integer> pick(ArrayList<Integer> a); a is the ArrayList to be parsed and returns the result as an ArrayList. Hint: These classes and functions may be used. Collection Collections.sort(Collection); Collection Collections.reverse(Collection) 裁判测试程序样例： import java.util.ArrayList; import java.util.Collections; import java.util.HashSet; import java.util.Scanner; public class Main { /* 请在这里填写答案 */ public static void main(String[] args) { ArrayList<Integer> lst = new ArrayList<>(); Scanner in = new Scanner(System.in); while ( in.hasNextInt() ) { lst.add(in.nextInt()); } lst = pick(lst); for ( int x:lst) { System.out.print(x+" "); } System.out.println(); in.close(); } }

public static void main(String[] args) { ArrayList<Integer> lst = new ArrayList(); Scanner in = new Scanner(System.in); while (in.hasNextInt()) { lst.add(in.nextInt()); } lst = pick(lst); for ...

使用java编写【问题描述】使用普通for循环、增强for循环、迭代器Iterator实现list集合的遍历【输入形式】无【输出形式】三行整数【样例输入】无【样例输出】 12 34 56 【样例说明】无【评分标准】测试用例完全正确得满分。 import java.util.ArrayList; import java.util.Iterator; public class Example03 { public static void main(Str

public static void main(String[] args) { ArrayList<Integer> list = new ArrayList(); list.add(12); list.add(34); list.add(56); // 普通 for 循环 for(int i = 0; i < list.size(); i++){ System.out...

import java.util.Scanner; import java.util.Arrays; import java.util.Comparator; import java.util.List; import java.util.ArrayList; import java.util.stream.Collectors; class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int numberOfWineshops = scanner.nextInt(); int numberOfPickedWineshops = scanner.nextInt(); int referencePrice = scanner.nextInt(); int[] WineshopPrices = new int[numberOfWineshops]; for (int i = 0; i < numberOfWineshops; i++) { WineshopPrices[i] = scanner.nextInt(); } Arrays.sort(WineshopPrices); int[][] priceDifference = new int[numberOfWineshops][2]; for (int i = 0; i < numberOfWineshops; i++) { int price = WineshopPrices[i]; priceDifference[i][0] = price; priceDifference[i][1] = Math.abs(price - referencePrice); } List<int[]> sortedPriceDifference = Arrays.stream(priceDifference) .sorted(Comparator.comparingInt(Wineshop -> Wineshop[1])) .collect(Collectors.toList()); List<Integer> pickedWineshopPrices = new ArrayList<>(); for (int i = 0; i < numberOfPickedWineshops; i++) { pickedWineshopPrices.add(sortedPriceDifference.get(i)[0]); } pickedWineshopPrices.sort(Integer::compareTo); for (int i = 0; i < pickedWineshopPrices.size(); i++) { System.out.print(pickedWineshopPrices.get(i)); if (i != pickedWineshopPrices.size() - 1) { System.out.print(" "); } } } }；这段代码每行注释下

public static void main(String[] args) { // 定义程序的入口方法 Scanner scanner = new Scanner(System.in); // 创建Scanner对象并关联控制台输入 int numberOfWineshops = scanner.nextInt(); // 读取一个...

解释代码package Test5; import Student.student; import java.util.ArrayList; import java.util.Collection; import java.util.Iterator; public class List { public static void main(String[] args){ //创建Collection集合对象 Collection<student> c = new ArrayList<student>(); //创建学生对象 student s1 = new student("小猫", 12); student s2 = new student("小雨", 15); student s3 = new student("小白", 20); student s4 = new student("小王", 30); student s5 = new student("小兰", 24); //把学生添加到集合 c.add(s1); c.add(s2); c.add(s3); c.add(s4); c.add(s5); //遍历集合 Iterator<student> it = c.iterator(); while (it.hasNext()) { student s = it.next(); System.out.println(s.getname() + "," + s.getage()); } } }

这段代码是一个 Java 程序，它创建了一个名为 List 的类。这个类包含了一个 main 方法，程序的入口点。在 main 方法中，首先创建了一个 Collection 集合对象，类型是 student，使用了 ArrayList 类来实现。然后，...

package step1; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import java.util.Scanner; public class Client { public static void main(String[] args) { List products = new ArrayList<String>(); Scanner scanner = new Scanner(System.in); int nums = scanner.nextInt(); for (int i = 0; i < nums; i++) { products.add(scanner.next()); } /****** Begin */ ///请用java自带的iterator实现products的正向遍历访问 /** End */ System.out.println("--------------------"); /** Begin */ ///请用自定义的iterator实现products的反向遍历访问 / End ***/ } }

public static void main(String[] args) { List<String> products = new ArrayList(); Scanner scanner = new Scanner(System.in); int nums = scanner.nextInt(); for (int i = 0; i ; i++) { products.add...

package com.exam.dao; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import com.exam.bean.User; /* * 用于登录验证的数据库 / public class JDBCTest { //数据库查询语句 public static String findsql = "selectfrom tb_user"; //数据库查询方法 public static List<User> Find() { //初始化查询结果集 ResultSet rs = null; PreparedStatement pstmt = null; Connection conn = null; List<User> list = new ArrayList(); int id = 0; String username, password = null; try { conn = DBUtil.getconn(); pstmt = conn.prepareStatement(findsql); rs = pstmt.executeQuery(); while (rs.next()) { id = rs.getInt(1); username = rs.getString(2); password = rs.getString(3); User user = new User(id, username, password); list.add(user); } } catch (Exception e) { e.printStackTrace(); } finally { DBUtil.closeAll(rs, pstmt, conn); } return list; } // 测试是否能够拿到数据 public static void main(String[] args) { List<User> list = new ArrayList(); list = Find(); User user = new User(); Iterator<User> it = list.iterator(); while (it.hasNext()) { user = it.next(); System.out.println(user.getId()); System.out.println(user.getUsername()); System.out.println(user.getPassword()); } } }填写注释

public static void main(String[] args) { List<User> list = new ArrayList(); list = Find(); User user = new User(); Iterator<User> it = list.iterator(); while (it.hasNext()) { user = it.next(); ...

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