import java.util.HashMap; public class Manage { public static void main(String[] args) { HashMap<String, String> teacherClassMap = new HashMap<>(); // 存储老师和班级的对应关系 HashMap<String, String[]> groupMap = new HashMap<>(); // 存储班级和小组的对应关系 HashMap<String, String[]> classStudentMap = new HashMap<>(); // 存储班级和学生的对应关系 // 添加数据 teacherClassMap.put("小王", "一班"); teacherClassMap.put("小李", "二班"); teacherClassMap.put("小明", "三班"); groupMap.put("一班", new String[]{"一组", "二组", "三组"}); groupMap.put("二班", new String[]{"甲组", "乙组", "丙组"}); groupMap.put("三班", new String[]{"A组", "B组", "C组"}); classStudentMap.put("一班", new String[]{"一组学生1", "一组学生2", "一组学生3"}); classStudentMap.put("二班", new String[]{"甲组学生1", "甲组学生2", "甲组学生3"}); classStudentMap.put("三班", new String[]{"A组学生1", "A组学生2", "A组学生3"}); // 遍历数据 for (String teacher : teacherClassMap.keySet()) { String className = teacherClassMap.get(teacher); System.out.println(teacher + " 管理的班级是：" + className); for (String groupName : groupMap.keySet()) { String[] groupName = groupMap.get(className); System.out.println(className + " 所有的组是：" + groupName); String[] students = classStudentMap.get(groupName); for (String student : students) { System.out.println(" 学生姓名：" + student); } } } } }

在Java中用Dom4j把这一段xml内容转成Map对象：<?xml version="1.0" encoding="UTF-8"?> <java version="1.6.0_26" class="java.beans.XMLDecoder"> <object class="java.util.HashMap"> <void method="put"> <string>att_20160719180419281NEk9</string> <string>cx</string> </void> <void method="put"> <string>att_20160511094248589ZKYq</string> <string>cnmm</string> </void> <void method="put"> <string>att_20161018153614188aTus</string> <string>zsx;fj</string> </void> <void method="put"> <string>att_20160422110906494XuEf</string> <null/> </void> <void method="put"> <string>att_20160511130210612UULE</string> <string>fjyxapp;jjgjapp;wx;jd;dxjg;tb;wsjy</string> </void> <void method="put"> <string>att_20160719180542840LnFm</string> <string></string> </void> <void method="put"> <string>att_20160511130025203ssle</string> <string>zdgsszta</string> </void> <void method="put"> <string>att_20160810131359346N0ra</string> <string>szjys</string> </void> <void method="put"> <string>att_20160511130031927equg</string> <string></string> </void> <void method="put"> <string>att_20160422110456036qp7Y</string> <null/> </void> <void method="put"> <string>att_20160422110543585f7iI</string> <string>cpjbxx</string> </void> </object> </java>

> <java version=\"1.6.0_26\" class=\"java.beans.XMLDecoder\"> <object class=\"java.util.HashMap\"> <void method=\"put\"> <string>att_20160719180419281NEk9</string> <string>cx</string> </void> <void ...

修正import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Set; public class Main { public static void main(String[] args) { Map<String,String> map =new HashMap<>(); map.put("1","2"); map.put("3","4"); map.put("5","6"); Set<Map.Entry<String, String>> set = map.entrySet(); for (Map.Entry<String, String> aaa : set) { System.out.println(aaa.getKey()+"..."+aaa.getValue()); } Iterator<Map.Entry<String, String>> bbb = map.entrySet().iterator(); while(bbb.hasNext()){ System.out.println(bbb.next().getKey()+"..."+bbb.next().getValue()); } } }

Iterator<Map.Entry<String, String>> bbb = map.entrySet().iterator(); while(bbb.hasNext()){ Map.Entry<String, String> entry = bbb.next(); System.out.println(entry.getKey()+"..."+entry.getValue()); } ...

package endTest; import java.util.Scanner; import java.util.HashMap; public class ArrayDistinct { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入一句英语："); String input = scanner.nextLine(); scanner.close(); String[] words = input.split("\\W+"); HashMap<String, Integer> map = new HashMap<String, Integer>(); for (String word : words) { if (map.containsKey(word)) { map.put(word, map.get(word) + 1); } else { map.put(word, 1); } } for (String word : map.keySet()) { System.out.println(word + ": " + map.get(word)); } } }用HashMap再写一遍

public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入一句英语："); String input = scanner.nextLine(); scanner.close(); String[] words = ...

import java.util.Map; public class test { public static void main(String[] args) { String a = "i am zjr form china am"; System.out.println(treemap.wordCount(a)); System.out.println(hashmap2.wordCount(a)); Map<String, Integer> stringIntegerMap = treemap.wordCount(a); Map<String, Integer> stringIntegerMap1 = hashmap2.wordCount(a); System.out.println(stringIntegerMap1.keySet()); System.out.println(stringIntegerMap1.values()); } } 这段代码的作用是什么

这段代码的作用是测试一个名为wordCount的方法在treemap和hashmap2中的运行结果。首先，将字符串"i am zjr form china am"赋给变量a。然后，分别使用treemap和hashmap2中的wordCount方法对字符串...

class java.util.HashMap cannot be cast to class java.util.LinkedHashMap

public static void main(String[] args) { HashMap<String, Integer> hashMap = new HashMap<>(); hashMap.put("A", 1); hashMap.put("B", 2); hashMap.put("C", 3); LinkedHashMap<String, Integer> ...

import java.util.*; public class Main { public static void main(String[] args) { Scanner input = new Scanner(System.in); String s = null; HashMap<String, Student> Sites = new HashMap<String, Student>(); while (!"end".equals(s)){ s = input.nextLine(); if (!"end".equals(s)){ String [] sr = s.split(" "); Student student = new Student(sr[1],Integer.parseInt(sr[2])); Sites.put(sr[0],student); } else break; } } } class Student{ private String name; private int scores; public Student(String name, int scores) { this.name = name; this.scores = scores; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getScores() { return scores; } public void setScores(int scores) { this.scores = scores; } }将这个按学号排序

public static void main(String[] args) { Scanner input = new Scanner(System.in); String s = null; TreeMap<String, Student> sites = new TreeMap<>(new Comparator<String>() { @Override public int ...

修正以下代码：import java.io.*; import java.net.ServerSocket; import java.net.Socket; import java.util.HashMap; import java.util.Map; import java.util.Scanner; public class Sever { // 保存所有用户的用户名和密码 private static Map<String, String> userMap = new HashMap<>(); // 指定的目录 private static File rootDir = null; // 保存所有登录的用户信息 private static Map<String, String> loginInfo = new HashMap<>(); public static void main(String[] args) throws Exception { // 从配置文件中读取用户信息和目录信息 BufferedReader reader = new BufferedReader(new FileReader("config.txt")); String line = null; while ((line = reader.readLine()) != null) { if (line.startsWith("user:")) { String[] user = line.split(":"); userMap.put(user[1], user[2]); } if (line.startsWith("dir:")) { String[] dir = line.split(":"); rootDir = new File(dir[1]); } } reader.close(); // 启动服务器 ServerSocket serverSocket = new ServerSocket(8000); int count = 0; System.out.println("服务器启动成功！"); while (true) { // 监听客户端连接 Socket socket = serverSocket.accept(); count++; System.out.println("第" + count + "个客户端连接成功！"); // 处理客户端请求 new Thread(new ServerThread(socket)).start();

public static void main(String[] args) throws Exception { // 从配置文件中读取用户信息和目录信息 BufferedReader reader = new BufferedReader(new FileReader("config.txt")); String line = null; while...

import java.util.HashMap; import java.util.Scanner; import java.util.TreeSet; public class Main { public static void main(String args[]) { Scanner sc = new Scanner(System.in); String[] name = {"Captain", "Priest", "Cook", "Doctor", "Engineer", "Hunter", "Gunner", "Navigator"}; HashMap<String, Integer> map = new HashMap<>(); map.put(sc.next(), 1); int n = sc.nextInt(); for (int i = 0; i < n; i++) { String s = sc.nextLine(); String ss = s.split(":")[0]; map.put(ss, 1); } TreeSet<String> t = new TreeSet<>(); for (int i = 0; i < 8; i++) { if (!map.containsKey(name[i])) t.add(name[i]); } if (t.size() == 0) System.out.println("Ready"); else { for (Object o : t) System.out.println(o); } } }

#include <string.h> #define NAME_SIZE 8 int main() { char name[NAME_SIZE][10] = {"Captain", "Priest", "Cook", "Doctor", "Engineer", "Hunter", "Gunner", "Navigator"}; char input[100]; int n = 0; ...

import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; public class PokeGame { public static void main(String[] args) { List<String> pokerCards = new ArrayList<>(); List<String> players = new ArrayList<>(); HashMap<String, List<String>> playerHands = new HashMap<>(); //创建了两个ArrayList对象，pokerCards和players，分别用于存储扑克牌和玩家信息。 //创建了一个HashMap对象playerHands，用于存储每个玩家的手牌。 String[] suits = {"♠", "♥", "♣", "♦"}; String[] ranks = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"}; //使用两个String数组suits和ranks来表示扑克牌的花色和点数。 for (String suit : suits) { for (String rank : ranks) { pokerCards.add(suit + rank); } } //使用嵌套的for循环将每个花色和点数组合在一起，构成一副完整的扑克牌，并将其添加到pokerCards中。 pokerCards.add("小王"); pokerCards.add("大王"); //添加了两张大小王到pokerCards中。 Collections.shuffle(pokerCards); //使用Collections.shuffle方法对pokerCards进行洗牌，打乱顺序。 players.add("小王"); players.add("小李"); players.add("小明"); //添加了三个玩家到players中。 int numPlayers = players.size(); int cardsPerPlayer = pokerCards.size() / numPlayers; int remainingCards = pokerCards.size() % numPlayers; //计算每个玩家应该分到的牌数和剩余的牌数。 int cardIndex = 0; for (String player : players) { List<String> hand = new ArrayList<>(); for (int i = 0; i < cardsPerPlayer; i++) { hand.add(pokerCards.get(cardIndex)); cardIndex++; } if (remainingCards > 0) { hand.add(pokerCards.get(cardIndex)); cardIndex++; remainingCards--; } playerHands.put(player, hand); } // Step 4: Display each player's hand for (String player : players) { System.out.println(player + "的手牌：" + playerHands.get(player)); } } } 改成用随机数组洗牌而不是用shuffle方法

public static void main(String[] args) { List<String> pokerCards = new ArrayList<>(); List<String> players = new ArrayList<>(); HashMap<String, List<String>> playerHands = new HashMap<>(); ...

Map<String,List<String>> eventMissionRoute = new HashMap(); 写简单java代码

public static void main(String[] args) { // 创建一个Map对象 Map<String, List<String>> eventMissionRoute = new HashMap<>(); // 添加键值对 List<String> missionList1 = new ArrayList<>(); ...

package 作业5; import java.awt.; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.; import java.io.File; import java.util.HashMap; import java.util.Scanner; import java.io.File; import java.util.HashMap; import java.util.Scanner; public class Example13_7{ public static void main( String args []){ WindowWord win = new WindowWord(); win.setTitle("英﹣汉小字典"); } } class WindowWord extends JFrame{ JTextField inputText,showText; WordPolice police; public WindowWord(){ setLayout(new FlowLayout()); inputText = new JTextField(6); showText = new JTextField(6); showText.setColumns(15); add(inputText); add(showText); police = new WordPolice(); police.setView(this); inputText.addActionListener(police); setBounds(100,100,400,280); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } class WordPolice implements ActionListener { WindowWord view; HashMap<String,String>hashtable; File file = new File ("E:\\JAVA\\上机\\作业5\\cet4.txt"); Scanner sc = null ; WordPolice () { hashtable = new HashMap< String,String >(); //System.out.println(hashtable.size()); try { sc = new Scanner ( file ); //System.out.println(sc); while (sc.hasNext ()) { String englishWord = sc . next (); String chineseWord = sc . next (); hashtable . put ( englishWord , chineseWord ); } HashMap<String,String> reversedHashtable = new HashMap<String,String>(); for (String key : hashtable.keySet()) { String value = hashtable.get(key); reversedHashtable.put(value, key); } hashtable.putAll(reversedHashtable); } catch(Exception e ) {} } public void setView(WindowWord view) { this.view = view; } public void actionPerformed(ActionEvent e) { String inputWord = view.inputText.getText (); if(hashtable.containsKey(inputWord)) { String outputWord = hashtable.get ( inputWord ); view.showText.setText (outputWord ); } else { String chineseWord = inputWord; for (String key : hashtable.keySet()) { String value = hashtable.get(key); if (value.equals(chineseWord)) { view.showText.setText(key); return; } } view.showText.setText ("没有此单词"); } } }把这段代码完善一下，让它能实现汉语翻译为英语，英语也能翻译为汉语，GUI界面不变

public static void main( String args []){ WindowWord win = new WindowWord(); win.setTitle("英﹣汉小字典"); } } class WindowWord extends JFrame{ JTextField inputText,showText; WordPolice...

import java.util.HashMap; import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入整数个数："); int n = scanner.nextInt(); int[] nums = new int[n]; System.out.println("请输入整数数组："); for(int i=0; i<n; i++) { nums[i] = scanner.nextInt(); } int result = singleNumber(nums); System.out.println("只出现一次的元素是：" + result); } public static int singleNumber(int[] nums) { HashMap<Integer, Integer> map = new HashMap<>(); for(int i=0; i<nums.length; i++) { if(map.containsKey(nums[i])) { map.put(nums[i], map.get(nums[i])+1); } else { map.put(nums[i], 1); } } for(int i=0; i<nums.length; i++) { if(map.get(nums[i]) == 1) { return nums[i]; } } return -1; // 如果没有找到只出现一次的元素，则返回-1 } }的标准代码

public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入整数个数："); int n = scanner.nextInt(); int[] nums = new int[n]; System.out.println(...

import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Scanner; public class CourseSelectionSystem { // 定义一个Map来存储学生选课信息 private static Map<String, List<String>> studentCourseMap = new HashMap<>(); public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (true) { System.out.println("请选择操作：1.查询学生选课信息 2.删除学生选课信息 3.存储学生选课信息 4.退出"); int choice = scanner.nextInt(); switch (choice) { case 1: queryStudentCourse(); break; case 2: deleteStudentCourse(); break; case 3: storeStudentCourse(); break; case 4: System.exit(0); break; default: System.out.println("无效的选择，请重新输入"); break; } } } // 查询学生选课信息 private static void queryStudentCourse() { Scanner scanner = new Scanner(System.in); System.out.println("请输入学生姓名："); String name = scanner.nextLine(); if (studentCourseMap.containsKey(name)) { List<String> courses = studentCourseMap.get(name); System.out.println(name + "选课情况如下："); for (String course : courses) { System.out.println(course); } } else { System.out.println(name + "没有选课"); } } // 删除学生选课信息 private static void deleteStudentCourse() { Scanner scanner = new Scanner(System.in); System.out.println("请输入学生姓名："); String name = scanner.nextLine(); if (studentCourseMap.containsKey(name)) { System.out.println("请输入要删除的课程名称："); String course = scanner.nextLine(); 增加一个更改学生选课的功能

List<String> courses = new ArrayList<>(); String[] courseArray = courseStr.split(","); for (String course : courseArray) { courses.add(course.trim()); } studentCourseMap.put(name, courses); ...

import java.util.*;public class ParseWords { public static void main(String[] args) { String str = "This is a sample string for testing purposes. This string contains some repeated words like this, sample, and string."; Set<String> words = new HashSet<>(); Map<String, Integer> wordCounts = new HashMap<>(); // 解析单词并添加到 HashSet 中 String[] tokens = str.split("[\\p{Punct}\\s]+"); for (String token : tokens) { if (words.contains(token)) { wordCounts.put(token, wordCounts.get(token) + 1); } else { words.add(token); wordCounts.put(token, 1); } } // 输出结果 System.out.println("重复的单词个数："); for (Map.Entry<String, Integer> entry : wordCounts.entrySet()) { if (entry.getValue() > 1) { System.out.println(entry.getKey() + ": " + entry.getValue()); } } System.out.println("不重复的单词个数：" + words.size()); System.out.println("消除重复后的单词列表："); for (String word : words) { System.out.println(word); } }}只用hashset实现上面的代码

public static void main(String[] args) { String str = "This is a sample string for testing purposes. This string contains some repeated words like this, sample, and string."; Set<String> words = ...

import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.HashMap; import java.util.Map; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.ListSelectionModel; import javax.swing.border.EmptyBorder; public class SensitiveWordAnalyzer extends JFrame { private JPanel contentPane; private JTextField textFile; private JTextField textKeyword; private JList<String> listWords; private Map<String, Integer> wordMap; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { SensitiveWordAnalyzer frame = new SensitiveWordAnalyzer(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public SensitiveWordAnalyzer() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300);分析这段代码

这段代码定义了一个名为SensitiveWordAnalyzer的Java GUI应用程序。该应用程序可以用来分析文本文件中的敏感词并统计它们出现的次数。应用程序包含一个JFrame窗口和几个Swing组件，包括JPanel、JTextField、JList、...

import java.io.;import java.util.;public class Main { public static void main(String[] args) { try { BufferedReader br = new BufferedReader(new FileReader("idiom.txt")); List<String> idiomList = new ArrayList<>(); Map<Character, List<String>> idiomMap = new HashMap<>(); String line; while ((line = br.readLine()) != null) { String[] parts = line.split(" "); String idiom = parts[0]; idiomList.add(idiom); char lastChar = idiom.charAt(idiom.length() - 1); if (!idiomMap.containsKey(lastChar)) { idiomMap.put(lastChar, new ArrayList<>()); } idiomMap.get(lastChar).add(idiom); } br.close(); BufferedWriter bw = new BufferedWriter(new FileWriter("idiom_result.txt")); br = new BufferedReader(new FileReader("idiom.txt")); while ((line = br.readLine()) != null) { String[] parts = line.split(" "); String idiom = parts[0]; char lastChar = idiom.charAt(idiom.length() - 1); int count = idiomMap.containsKey(lastChar) ? idiomMap.get(lastChar).size() : 0; bw.write(line + " " + count); bw.newLine(); } bw.close(); br.close(); } catch (IOException e) { e.printStackTrace(); } }}这个代码在统计总末尾时count总是小于本该等于的值，是不是在循环内进行map添加时，受当前已经添加的成语列表限制，未扫描到的无法统计进去，怎么改善这个问题

public static void main(String[] args) { try { BufferedReader br = new BufferedReader(new FileReader("idiom.txt")); List<String> idiomList = new ArrayList<>(); Map<Character, List<String>> ...

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