package fileDemo; import java.util.*; import java.io.*; public class scoreDemo { public static void main(String[] args) throws IOException { TreeSet<score> scores=new TreeSet<>(); Scanner sc=new Scanner(System.in); String []s=new String[1024]; for(int i=0;i<3;i++) { System.out.println("请用户输入姓名成绩"); String name=sc.next(); int score=sc.nextInt(); score ss=new score(name,score); ss.setName(name); ss.setJavascore(score); scores.add(ss); } File f=new File("score.txt"); BufferedWriter bw=new BufferedWriter(new FileWriter(f)); bw.write("姓名\t"); bw.write("java成绩\t"); bw.newLine(); bw.flush(); for(score stu:scores) { bw.write(stu.getName()+'\t'); bw.write(stu.getJavascore()); bw.newLine(); bw.flush(); } bw.close(); } } 为什么不能存数字

package XXLChess; //import org.reflections.Reflections; //import org.reflections.scanners.Scanners; import processing.core.PApplet; import processing.core.PImage; import processing.data.JSONObject; import processing.data.JSONArray; import processing.core.PFont; import processing.event.MouseEvent; import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.TimeUnit; import java.awt.Font; import java.io.; import java.util.; public class App extends PApplet { public static final int SPRITESIZE = 480; public static final int CELLSIZE = 48; public static final int SIDEBAR = 120; public static final int BOARD_WIDTH = 14; public static int WIDTH = CELLSIZEBOARD_WIDTH+SIDEBAR; public static int HEIGHT = BOARD_WIDTHCELLSIZE; public static final int FPS = 60; public String configPath; public App() { this.configPath = "config.json"; } /** * Initialise the setting of the window size. */ public void settings() { size(WIDTH, HEIGHT); } /** * Load all resources such as images. Initialise the elements such as the player, enemies and map elements. */ public void setup() { frameRate(FPS); // Load images during setup // PImage spr = loadImage("src/main/resources/XXLChess/"+...); // load config JSONObject conf = loadJSONObject(new File(this.configPath)); } /** * Receive key pressed signal from the keyboard. */ public void keyPressed(){ } /** * Receive key released signal from the keyboard. */ public void keyReleased(){ } @Override public void mouseClicked(MouseEvent e) { } @Override public void mouseDragged(MouseEvent e) { } /** * Draw all elements in the game by current frame. */ public void draw() { } // Add any additional methods or attributes you want. Please put classes in different files. public static void main(String[] args) { PApplet.main("XXLChess.App"); } }

这是一个 Java 程序，使用 Processing 库进行可视化。它创建了一个名为 App 的类，该类具有以下属性： - SPRITESIZE：棋子的尺寸 - CELLSIZE：棋盘格子的尺寸 - SIDEBAR：侧边栏的宽度 - BOARD_WIDTH：棋盘的宽度 -...

import java.io.File; import java.util.ArrayList; import java.util.List; import cn.hutool.core.io.resource.ClassPathResource; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.internal.DefaultShellCallback; public class GeneratorSqlmap { public void generator() throws Exception{ List<String> warnings = new ArrayList<>(); boolean overwrite = true; ClassPathResource configFile = new ClassPathResource("generatorConfig.xml"); / Begin / / End / } public static void main(String[] args) throws Exception { try { GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap(); generatorSqlmap.generator(); } catch (Exception e) { e.printStackTrace(); } } } 我要实现数据库逆向工程代码应该怎么补充

import java.util.List; public interface UserMapper { int deleteByPrimaryKey(Integer id); int insert(User record); User selectByPrimaryKey(Integer id); List<User> selectAll(); int ...

package studentsSystem; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.util.Properties; import javax.sql.DataSource; import com.alibaba.druid.pool.DruidDataSourceFactory; public class system { public static void main(String[] args) throws Exception{ // TODO Auto-generated method stub； Properties prop=new Properties(); prop.load(new FileInputStream("shixun/src/druid.properties")); DataSource dataSource=DruidDataSourceFactory.createDataSource(prop); Connection conn=dataSource.getConnection(); String sql="update student set 姓名=王五 where 学号=01"; PreparedStatement pstm=conn.prepareStatement(sql); ResultSet rs=pstm.executeQuery(); pstm.close(); conn.close(); } }

String sql="update student set 姓名=? where 学号=?"; PreparedStatement pstm=conn.prepareStatement(sql); pstm.setString(1, "王五"); pstm.setString(2, "01"); pstm.executeUpdate();

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...

package educoder; import java.io.IOException; import java.util.LinkedList; import java.util.List; import java.util.stream.Collectors; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; … job.setOutputValueClass(IntWritable.class); FileInputFormat.addInputPath(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); System.exit(job.waitForCompletion(true) ? 0 : 1); } }

public static void main(String[] args) throws Exception { JobConf conf = new JobConf(IntSumMapperReducer.class); conf.setJobName("integer_sum"); conf.setOutputKeyClass(Text.class); conf....

package step3; import java.io.BufferedInputStream; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.net.URI; import java.io.File; … public static void main(String[] args) throws IOException { //请在 Begin-End 之间添加代码，完成任务要求。 /***** Begin / / End *****/ } } 根据这个要求写代码

public static void main(String[] args) throws IOException { // 请在 Begin-End 之间添加代码，完成任务要求。 /********* Begin *********/ String localFilePath = "/develop/input/hello.txt"; String ...

在Begin - End区域内进行代码补充，具体任务如下：在src/output目录下创建hello.txt，test.txt文件。需要先创建test.txt，后创建hello.txt。package step1; import java.io.File; import java.io.FileFilter; import java.io.IOException; import java.util.Scanner; public class Task { /***** Begin / public void solution() { / End *****/ } }

public static void main(String[] args) { // 定义输出目录路径 File outputDir = new File("src/output"); // 如果目录不存在则创建 if (!outputDir.exists()) { outputDir.mkdirs(); } try { // ...

package com.test; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import java.util.Scanner; public class ChatClient { public static void main(String[] args) throws UnknownHostException, IOException { Socket sk=new Socket(InetAddress.getByName("127.0.0.1"),9090); //打开读取的字节流 InputStream is = sk.getInputStream(); //字节流转换为字符流量 InputStreamReader isr=new InputStreamReader(is); //添加buffered BufferedReader br=new BufferedReader(isr); String str = br.readLine(); System.out.println("服务器："+str); //定义一个输入器 Scanner mys=new Scanner(System.in); System.out.println("请输入您要发送的内容:"); String sa=mys.next(); OutputStream os = sk.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os); BufferedWriter bw = new BufferedWriter(osw); bw.write(sa); bw.newLine(); bw.flush(); } }

这是一个Java编写的聊天客户端程序。它创建了一个套接字(Socket)连接到本地IP地址为"127.0.0.1"，端口号为9090的服务器。程序从套接字的输入流中获取数据，将字节流转换为字符流并使用缓冲区来读取。然后，程序从...

ChatClient.java程序: package com.test; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.InetAddress; import java.net.Socket; import java.net.UnknownHostException; import java.util.Scanner; public class ChatClient { Public static void main(String[] args) throws UnknownHostException IOException { Socketsk=newSocket(InetAddress.getByName("127.0.0.1"),9090); //打开读取的字节流 InputStream is = sk.getInputStream(); //字节流转换为字符流量 InputStreamReader isr=new InputStreamReader(is); //添加buffered BufferedReader br=new BufferedReader(isr); String str = br.readLine(); System.out.println("服务器："+str); //定义一个输入器 Scanner mys=new Scanner(System.in); System.out.println("请输入您要发送的内容:"); String sa=mys.next(); OutputStream os = sk.getOutputStream(); OutputStreamWriter osw = new OutputStreamWriter(os); BufferedWriter bw = new BufferedWriter(osw); bw.write(sa); bw.newLine(); bw.flush(); } }

这段代码是一个简单的聊天客户端程序，它会连接到本地IP地址为127.0.0.1，端口号为9090的服务端程序，并发送一条消息。具体来说，它的执行过程如下： 1. 创建一个Socket对象，指定要连接的服务端的IP地址和端口号；...

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。...

package com.showdata; import java.awt.Dimension; import java.io.IOException; import java.util.List; import com.kennycason.kumo.CollisionMode; import com.kennycason.kumo.WordCloud; import com.kennycason.kumo.WordFrequency; import com.kennycason.kumo.nlp.FrequencyAnalyzer; public class WordCloud_img { public WordCloud get() throws IOException { / Begin / //1.为实例化词云做准备 //2.修改词云的实例化 WordCloud wordCloud = null; //3.生成词云并写入图片 / End / return wordCloud; } }

public static void main(String[] args) throws Exception { // 初始化 FrequencyAnalyzer 并设置参数 final FrequencyAnalyzer frequencyAnalyzer = new FrequencyAnalyzer(); frequencyAnalyzer....

package mergeData.mapreduce; import org.apache.commons.lang.StringUtils; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.NullWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.input.FileSplit; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.util.HashMap; public class MergeDataDriver { / Begin / public static class Map extends Mapper{LongWritable, Text, NullWritable,Text>{} / End / } / Begin / public static class Reduce extends Reducer{ } / End / public static void main(String[] args) throws Exception { //创建配置信息 Configuration conf = new Configuration(); // 创建任务 Job job = Job.getInstance(conf); //如果输出目录存在，我们就删除 String outputpath = "/root/files"; Path path = new Path(outputpath); FileSystem fileSystem = path.getFileSystem(conf); if (fileSystem.exists(path)) { fileSystem.delete(path, true); } / Begin / //设置执行类 //设置自定义Mapper类 //设置自定义Reducer类(若没用reduce可删除) //设置map函数输出数据的key和value的类型 //设置reduce函数输出数据的key和value的类型(若没用reduce可删除) //设置输入输出路径 / End / //提交作业，若成功返回true,失败返回falase boolean b = job.waitForCompletion(true); if (b

public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); Job job = Job.getInstance(conf, "Word Count Example"); job.setJarByClass(WordCountDriver.class...

package step1; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.safety.Whitelist; public class Task { //通过filePath文件路径获取Docment对象 public Document getDoc(String filePath) throws IOException{ /** Begin / return null; / End / } / * 获取清理后的信息 * @param doc * @return */ public List<String> cleanHTML(Document doc){ / Begin / return null; / End / } } 填充代码

public static void main(String[] args) throws Exception { // 定义HTML文件路径 File inputFile = new File("path/to/your/html/file.html"); // 设置编码格式为UTF-8，并指定基础URL用于相对链接解析 ...

package step1; import java.io.File; import java.io.FileFilter; import java.io.IOException; import java.util.Scanner; public class Task { /***** Begin / public void solution(){ //本题采用所给知识try catch方式所编写 try{ File file2 = new File("src/output/test.txt");//创建文件类对象 file2.createNewFile();//创建新的文件夹 }catch(IOException e){ e.printStackTrace(); } try{ File file1 = new File("src/output/hello.txt");//创建文件类对象 file1.createNewFile();//创建新的文件夹 }catch(IOException e){ e.printStackTrace(); } / End *****/ } }

public static void main(String[] args) { // 定义存储路径及新建文件名称 String storePath = "C:\\example"; String fileName = "test.txt"; // 构建完整路径字符串 String fullPath = storePath + "\\" +...

FileTools . java package p8; import java . io .; 40 import java . util .; public class FileTools { public static void main ( String [] args )( String sourceFileName =" c :\\123.txt"; String objectFileName =" c :\\456.txt"; FileTools . copyFile ( sourceFileName , objectFileName ); public static void copyFile ( String sourceFileName , String objectFileName ){// add your code here}}}补充这段代码，实现一个文件复制类 ieTools ，它包含一个静态方法 copyFile ( String sourceFileName , String objectFileNam )，功能是将名为 sourceFileName 的源文件复制到目的文件 objectF ileName 中。

public static void main(String[] args) { String sourceFileName = "c:\\123.txt"; String objectFileName = "c:\\456.txt"; copyFile(sourceFileName, objectFileName); } public static void copyFile...

package srsc; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.Scanner; public class Srsc { public static void main(String[] args) throws IOException { // TODO Auto-generated method stub String filePath = "D:\\test.txt"; BufferedWriter bw = new BufferedWriter(new FileWriter(filePath)); Scanner scanner = new Scanner(System.in); String name = scanner.next(); String gender = scanner.next(); int age = scanner.nextInt(); Student stu = new Student(name, gender, age); bw.write(stu.toString()); bw.newLine(); BufferedReader br = new BufferedReader(new FileReader(filePath)); String rline; while((rline = br.readLine()) != null) { System.out.println(rline); } bw.close(); br.close(); scanner.close(); } }为什么没有输出到控制台

这是因为在程序中没有使用 System.out.println() 或 System.out.print() 方法将文本输出到控制台。在程序中，您已经将学生信息写入了文件，并在文件中读取了该信息，但是您需要使用 System.out.println() 或 ...

java头哥package step3; import java.util.Map; import java.util.HashMap; import java.util.StringTokenizer; public class StudentDemo{ //获取单词的数量 public Map<String, Integer> getWordCount(String str) { Map<String, Integer> map = new HashMap<String, Integer>(); //请在此添加实现代码 / Begin / / End / return map; } }实训答案

public static void main(String[] args) throws Exception { Configuration conf = new Configuration(); Job job = Job.getInstance(conf, "Word Count"); job.setJarByClass(WordCount.class); job....

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