youzhayutou.github.io

import java.util.ArrayList; import java.util.List; public class TestArrayList02 { public static void printInfo(List arrList){ for(int i=0;i<arrList.size();i++){ StudentInfo stu = (StudentInfo) arrList.get(i); System.out.println("学号:"+stu.getId()+";姓名:"+stu.getName()+";电话号码:"+stu.getTel()); } } public static void main(String[] args){ StudentInfo stu01 = new StudentInfo(1,"张华","1111111"); StudentInfo stu02 = new StudentInfo(2,"李平","2222222"); StudentInfo stu03 = new StudentInfo(3,"王杰",&

public class StudentInfo { int id; String name; String tel; public StudentInfo(int id,String name,String tel){ this.id = id; this.name=name; this.tel=tel; } public int getId(){ return id; } public void setId(int id){ this.id=id; } public String getName(){ return name; } public void setName(String name){ this.name=name; } public String getTel(){ return tel; } public void setTel(String tel){ this.tel=tel; } public String toString(){ return name+"的联系电话是:"+tel; } }

package org.example; import java.io.*; import java.net.*; import java.nio.charset.StandardCharsets; import java.util.logging.*; public class TalkServer { private static final Logger logger = Logger.getLogger(TalkServer.class.getName()); public static void main(String[] args) { ServerSocket serverSocket = null; try { // 创建服务器端 ServerSocket 对象，监听端口 2000 serverSocket = new ServerSocket(2000); logger.info("服务器已启动，等待客户端连接..."); // 不断监听客户端连接 while (true) { Socket clientSocket = serverSocket.accept(); // 接受客户端

package org.example; import java.io.*; import java.net.*; import java.util.logging.*; public class Talk { // 创建日志记录器 private static final Logger logger = Logger.getLogger(Talk.class.getName()); public static void main(String[] args) { try { // 建立与服务器的连接 Socket clientSocket = new Socket("127.0.0.1", 2000); // 连接到本地服务器的 2000 端口 // 建立接收服务器端信息的输入流对象 br BufferedReader br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream(), "UTF-8")); // 建立向服务器端写出信息的

package com.company; abstract class Employee { int salary; void setSalary(int salary) { this.salary=salary; } abstract void showSalary(); } class Saler extends Employee{ void showSalary() { System.out.println("销售员的月薪为￥"+salary*8*30); } } class Manager extends Employee{ void showSalary() { System.out.println("经理的月薪为：￥"+salary); } } public class EmpDemo { public static void main(String[] args){ Employee emp; emp=new Saler(); emp.setSalary(15); emp.showSalary(); emp=new Manager(); emp.setSalary(5000); emp.showSalary(); } }

class MyArrayException extends NegativeArraySizeException{ public MyArrayException(String message){ super(message); } public String getInfo(){ String info="如看到此信息,请重新创建数组!"; return info; } } public class UserDefExceptionDemo{ static int size; static int a[]; static void checkArraySize() throws MyArrayException{ if(size>0){ a=new int[size]; System.out.println("数组创建成功!"); } else throw new MyArrayException("数组创建错误，请检查下标！"); } public static void main(String[] args){ size=Integer.parseInt(args[0]); try{

class OuterClass{ String str; boolean outerClassAccessible; InnerClass in; public OuterClass(){ str=new String("OuterClass variable"); outerClassAccessible=true; InnerClass in = new OuterClass.InnerClass(); System.out.println(str); System.out.println("外部类>访问外部类成员:"+outerClassAccessible); System.out.println("外部类>访问内部类成员:"+in.innerClassAccessible); } class InnerClass{ String str; boolean innerClassAccessible; public InnerClass(){ str=new String("InnerClass variable"); innerClassAccessible=true; System.out.print

import java.io.*; public class TestDateStream { public static void main(String[]ages){ Member[]members={ new Member("Tom",90), new Member("Marry",95), new Member("Bush",88) }; try { DataOutputStream dataOutputStream = new DataOutputStream(new FileOutputStream("C:\\my.dat")); Member member = null; for(int i=0;i<members.length;i++){ member=members[i]; dataOutputStream.writeUTF(member.getName()); dataOutputStream.writeInt(member.getAge()); } dataOutputStream.flush(); dataOutputStream.close(); DataInputStream dataInputStream = new DataInputStream(new File

import java.io.*; public class FileIOTest { public static void main(String[] args){ FileReader fr=null; FileWriter fw=null; try { fr=new FileReader("C:\\myproject\\document\\readme1.txt"); fw=new FileWriter("C:\\myproject\\document\\readme2.txt"); char c[]=new char[260]; while (fr.read(c)!=-1){ String str=new String(c); System.out.println("正在写入："+str); fw.write(c); } fr.close(); fw.close(); } catch (FileNotFoundException e){e.printStackTrace();} catch (IOException e){e.printStackTrace();} } }

import java.io.*; public class BuffersdTest { static File file1,file2; static FileInputStream finStream; static FileOutputStream foutStream; static InputStreamReader inStreamReader; static OutputStreamWriter outStreamWriter; static BufferedReader br; static BufferedWriter wr; public static void main(String[]args) { try { file1 = new File("C:\\myproiect\\document\\readme1.doc"); file2 = new File("C:\\myproiect\\document\\readem2.txt"); finStream = new FileInputStream(file1); foutStream = new FileOutputStream(file2); br = new BufferedReader(new InputStreamReader(finStream));

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