//都是从新手过来的,以下代码供参考
//1.
public?class?BankAccount?{
private?static?String?acctnum;
private?static?double?money;
private?static?void?showAcct()?{
System.out.println("账号为:?"?+?acctnum);
}
private?static?void?showMoney()?{
System.out.println("余额为:?"?+?money);
public?BankAccount(String?acc,?double?m)?{
this.acctnum?=?acc;
this.money?=?m;
public?static?void?main(String[]?args)?{
ba.showAcct();
ba.showMoney();
public?class?Triangle?{
private?static?float?a;
private?static?float?b;
private?static?float?c;
public?Triangle(float?a,?float?b,?float?c)?{
this.a?=?a;
this.b?=?b;
this.c?=?c;
public?static?boolean?judgeTriangle(float?a,?float?b,?float?c)?{
if?((a?Math.abs(b?-?c)?a?b?+?c)
(b?Math.abs(a?-?c)?b?a?+?c)
(c?Math.abs(a?-?b)?c?a?+?b))
return?true;
else
return?false;
public?float?getCircumference()?{
return?this.a?+?this.b?+?this.c;
public?class?TestTriangle?{
System.out.print("能够成三角形,周长为:?");
System.out.println("不能构成三角形");
贪吃蛇游戏 望采纳
import java.awt.Button;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Snake extends JFrame implements KeyListener{
int Count=0;
ArrayListPoint snake_list=new ArrayListPoint();
Point bean=new Point(-1,-1);//保存随机豆子【坐标】
//构造方法
public Snake()
{
//窗体初始化
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.getContentPane().setBackground(Color.gray);
this.setLayout(f);
grid[i][j]=new Button();
this.add(grid[i][j]);
grid[i][j].setVisible(false);
grid[i][j].addKeyListener(this);
grid[i][j].setBackground(Color.blue);
//蛇体初始化
grid[10][10].setVisible(true);
grid[11][10].setVisible(true);
//在动态数组中保存蛇体按钮坐标【行列】信息
snake_list.add(new Point(10,10));
snake_list.add(new Point(11,10));
this.rand_bean();
this.setTitle("总分：0");
this.setVisible(true);
//该方法随机一个豆子,且不在蛇体上,并使豆子可见
public void rand_bean(){
Random rd=new Random();
do{
}while(snake_list.contains(bean));
grid[bean.x][bean.y].setVisible(true);
grid[bean.x][bean.y].setBackground(Color.red);
//判断拟增蛇头是否与自身有碰撞
public boolean is_cross(Point p){
boolean Flag=false;
for(int i=0;isnake_list.size();i++){
if(p.equals(snake_list.get(i) )){
Flag=true;break;
return Flag;
//判断蛇即将前进位置是否有豆子,有返回true,无返回false
public boolean isHaveBean(){
int x=snake_list.get(0).x;
int y=snake_list.get(0).y;
Point p=null;
if(Direction==1)p=new Point(x-1,y);
if(bean.equals(p))Flag=true;
//前进一格
public void snake_move(){
if(isHaveBean()==true){//////////////有豆子吃
Point p=new Point(bean.x,bean.y);//【很重要,保证吃掉的是豆子的复制对象】
snake_list.add(0,p); //吃豆子
grid[p.x][p.y].setBackground(Color.blue);
this.Count++;
this.setTitle("总分："+Count);
this.rand_bean(); //再产生一个豆子
}else{///////////////////无豆子吃
//取原蛇头坐标
//根据蛇头坐标推算出拟新增蛇头坐标
if(Direction==1)p=new Point(x-1,y);//计算出向上的新坐标
//若拟新增蛇头碰壁,或缠绕则游戏结束
JOptionPane.showMessageDialog(null, "游戏结束！");
System.exit(0);
//向蛇体增加新的蛇头坐标,并使新蛇头可见
snake_list.add(0,p);
grid[p.x][p.y].setVisible(true);
//删除原蛇尾坐标,使蛇尾不可见
int x1=snake_list.get(snake_list.size()-1).x;
int y1=snake_list.get(snake_list.size()-1).y;
grid[x1][y1].setVisible(false);
snake_list.remove(snake_list.size()-1);
@Override
public void keyPressed(KeyEvent e) {
public void keyReleased(KeyEvent e) {}
public void keyTyped(KeyEvent e) {}
public static void main(String[] args) throws InterruptedException {
Snake win=new Snake();
while(true){
win.snake_move();
import java.net.*;
import java.io.*;
public class ClientSocketDemo
Socket socket = null;
//声明客户器端数据输入输出流
DataInputStream in;
DataOutputStream out;
//声明字符串数组对象response,用于存储从服务器接收到的信息
String response[];
public ClientSocketDemo()
try
in = new DataInputStream(socket.getInputStream());
out = new DataOutputStream(socket.getOutputStream());
String ip = String.valueOf(socket.getLocalAddress());
String port = String.valueOf(socket.getLocalPort());
//向服务器发送数据
out.writeUTF("Hello Server.This connection is from client.");
out.writeUTF(ip);
out.writeUTF(port);
//从服务器接收数据
for (int i = 0; i response.length; i++)
response[i] = in.readUTF();
System.out.println(response[i]);
catch(UnknownHostException e){e.printStackTrace();}
catch(IOException e){e.printStackTrace();}
public ClientSocketDemo(String hostname)
//执行过程中,有两个个参数时的构造方法,第一个参数hostname指定服务器地址
//第一个参数serverPort指定服务器端口号
public ClientSocketDemo(String hostname,String serverPort)
socket = new Socket(hostname,Integer.parseInt(serverPort));
public static void main(String[] args)
String comd[] = args;
if(comd.length == 0)
ClientSocketDemo demo = new ClientSocketDemo();
else if(comd.length == 1)
System.out.println("Use default port");
ClientSocketDemo demo = new ClientSocketDemo(args[0]);
System.out.println("Hostname and port are named by user");
ClientSocketDemo demo = new ClientSocketDemo(args[0],args[1]);
else System.out.println("ERROR");
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
【ServerSocketDemo.java 服务器端Java源代码】
public class ServerSocketDemo
//声明ServerSocket类对象
ServerSocket serverSocket;
//声明并初始化服务器端监听端口号常量
//声明服务器端数据输入输出流
//声明InetAddress类对象ip,用于获取服务器地址及端口号等信息
InetAddress ip = null;
String request[];
public ServerSocketDemo()
//获取本地服务器地址信息
ip = InetAddress.getLocalHost();
//以PORT为服务端口号,创建serverSocket对象以监听该端口上的连接
serverSocket = new ServerSocket(PORT);
Socket socket = serverSocket.accept();
System.out.println("This is server:"+String.valueOf(ip)+PORT);
request[0] = in.readUTF();
request[1] = in.readUTF();
System.out.println("Received messages form client is:");
System.out.println(request[0]);
System.out.println(request[1]);
out.writeUTF("Hello client!");
out.writeUTF("Your ip is:"+request[1]);
ServerSocketDemo demo = new ServerSocketDemo();
public static void main(String []args){
java.util.Random ran=new java.util.Random();
for(int i=0;iarr.length;i++){
int temp=ran.nextInt(100)+1;
arr[i]=temp;
for(int j=0;ji;j++){
if(arr[j]==temp){
i--;
break;
String str="您的随机数是：";
str=str+arr[i]+" ";
System.out.println(str);
第一题
import java.util.Random;
import java.util.Scanner;
public class Guess{
public static void main(String[] args) {
int rightNum = new Random().nextInt(100) + 1;
Scanner scanner = new Scanner(System.in);
int input = 0;
System.out.print("清猜数字(1-100)!");
input = scanner.nextInt();
if(input rightNum){
System.out.println("猜大了!");
else if(input rightNum){
System.out.println("猜小了!");
}while(input != rightNum);
System.out.println("猜对了" + rightNum);
第二题
import java.util.* ;
public class A{
public static void main(String args[]){
int i,j,k,temp;
a[0][0]=(int)(100*Math.random());
a[0][1]=(int)(100*Math.random());
a[1][0]=(int)(100*Math.random());
a[1][1]=(int)(100*Math.random());
System.out.println("a[0]["+j+"]="+a[0][j]);
System.out.println(" ");
System.out.println("a[1]["+j+"]="+a[1][j]);
if(a[i][j]a[i][k+1]){
temp=a[i][j];
a[i][j]=a[i][k+1];
a[i][k+1]=temp;
System.out.println("第一行按从小到大排列：");
System.out.println("第二行按从小到大排列：");
System.out.println("a[1]["+j+"]=" +a[1][j]);
春春?还不快采纳嘛
//这是个聊天程序, 在ECLIPSE 运行 Client.java 就可以了. 连接是：localhost
//Server 代码,
package message;
public class Server {
public static void main(String[] args) throws Exception{
System.out.print("Server");
Vector v=new Vector();
Socket sk=socket.accept();
DataInputStream in=new DataInputStream(sk.getInputStream());
DataOutputStream out=new DataOutputStream(sk.getOutputStream());
v.add(sk);
new ServerThread(in,v).start();
//ServerThread.java 代码
public class ServerThread extends Thread{
Vector all;
public ServerThread(DataInputStream in,Vector v){
this.in=in;
this.all=v;
public void run()
while(true)
try{
String s1=in.readUTF();
for(int i=0;iall.size();i++)
Object obj=all.get(i);
Socket socket=(Socket)obj;
DataOutputStream out=new DataOutputStream(socket.getOutputStream());
out.writeUTF(s1);
System.out.print(i);
out.flush();
System.out.print("Message send over!");
}catch(Exception e){e.printStackTrace();};
//ClientFrame.java 代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ClientFrame extends JFrame implements ActionListener{
JButton b1=new JButton ("SendMessage");
JLabel l=new JLabel("输入服务器名字:");
JPanel p1=new JPanel();
Socket socket;
public ClientFrame()
this.getContentPane().add(p1);
p1.setLayout(new BorderLayout());
b1.addActionListener(this);
this.pack();
show();
public void actionPerformed(ActionEvent e)
if(e.getActionCommand().equals("Link Server"))
JOptionPane.showMessageDialog(this, "Connection Success");
DataInputStream in=new DataInputStream(socket.getInputStream());
new ClientThread(in,area).start();
catch(Exception e1){
JOptionPane.showMessageDialog(this, "Connection Error");
e1.printStackTrace();};
else if(e.getActionCommand().equals("SendMessage"))
out.writeUTF(t1.getText());
t1.setText("");
}catch(Exception e1){e1.printStackTrace();};
//ClientThread.java 代码
public class ClientThread extends Thread {
JTextArea area;
public ClientThread(DataInputStream in,JTextArea area){
this.area=area;
String s=in.readUTF();
area.append(s);
catch(Exception e){e.printStackTrace();};
//Client.java代码
public class Client {
/**
* @param args
*/
new ClientFrame();
// 每段代码都是个类,不要弄在一个文件里. 运行 Client.java
good luck to you!
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