仿百度知道java源碼

㈠ java源代碼

packagecom.;

importjava.util.ArrayList;
importjava.util.List;
importjava.util.Scanner;

importstaticjava.lang.System.out;
importstaticjava.lang.System.in;
/**
*Createdbytracyon2017/10/11.
*/
publicclassLR{

staticint[]numbers;
staticList<Domain>domains=newArrayList<>();

publicstaticvoidmain(String...asd){
intm,n;
out.print("請輸入數字個數N：");
n=input(1,Integer.MAX_VALUE);
out.print("請輸入計算行數M：");
m=input(1,10000);
out.println("請輸入"+n+"個數字,每個數字介於1跟1000000之間，用空格隔開:");
numbers=inputNumbers(n);
for(inti=0;i<m;i++){
domains.add(inputDomain(n,i+1));
}
for(Domaindomain:domains){
domain.output();
}
}

/**
*輸入一個介於min跟max之間的整數
*@parammin
*@parammax
*@return
*/
privatestaticintinput(intmin,intmax){
Scannerscanner=newScanner(in);
try{
inti=scanner.nextInt();
if(i<min||i>max){
out.print("輸入數字大小不符合要求，請重新輸入」");
returninput(min,max);
}
returni;
}catch(Exceptione){
out.print("您輸入的不是數字，請重新輸入「");
returninput(min,max);
}
}

/**
*輸入N個介於1到1000000之間的整數
*@paramn
*@return
*/
privatestaticint[]inputNumbers(intn){
Scannerscanner=newScanner(in);
StringnumStr=scanner.nextLine();
String[]nums=numStr.trim().split("\s+");
if(nums.length!=n){
out.println("輸入數字個數不對，請重新輸入：");
returninputNumbers(n);
}
int[]numbers=newint[n];
for(inti=0;i<n;i++){
try{
intnumber=Integer.valueOf(nums[i]);
if(number<1||number>10000){
out.print("輸入數字大小不符合要求，請重新輸入」");
numbers[i]=input(1,1000000);
}else{
numbers[i]=number;
}
}catch(NumberFormatExceptione){
out.print(String.format("您輸入的%s不是數字，請重新輸入：",nums[i]));
numbers[i]=input(1,1000000);
}
}
returnnumbers;
}

(intn,intindex){
out.println("請輸入第"+index+"行的2個數字L,R(1<=L<=R<=%d)用空格隔開：");
Scannerscanner=newScanner(in);
StringnumStr=scanner.nextLine();
String[]nums=numStr.trim().split("\s+");
if(nums.length!=2){
out.print(String.format("輸入數字個數不對，請重新輸入!",n));
returninputDomain(n,index);
}
Stringls=nums[0];
Stringrs=nums[1];
try{
intl=Integer.valueOf(ls);
intr=Integer.valueOf(rs);
if(l<1||r<l||r>n){
out.print(String.format("輸入數字大小不符合，請重新輸入!",n));
returninputDomain(n,index);
}
returnnewDomain(l,r,index);
}catch(NumberFormatExceptione){
out.println(String.format("輸入數字格式錯誤，請重新輸入2個數字L,R(1<=L<=R<=%d)用空格隔開：",n));
returninputDomain(n,index);
}
}

privatestaticclassDomain{
intl;
intr;
intindex;

Domain(intl,intr,intindex){
this.l=l;
this.r=r;
this.index=index;
}

voidoutput(){
intresult=0;
for(inti=l-1;i<r;i++){
result+=numbers[i];
}
out.println(String.format("第%d行：第%d到第%d個數之和為：%d",index,l,r,result));
}
}
}

㈡ java中如何根據一個網址獲得該網頁的源代碼

package test;

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpTest {

private String u;

private String encoding;

public static void main(String[] args) throws Exception {

HttpTest client = new HttpTest("http://www..com/", "UTF-8");

client.run();

}

public HttpTest(String u, String encoding) {

this.u = u;

this.encoding = encoding;

}

public void run() throws Exception {

URL url = new URL(u);// 根據鏈接（字元串格式），生成一個URL對象

HttpURLConnection urlConnection = (HttpURLConnection) url

.openConnection();// 打開URL

BufferedReader reader = new BufferedReader(new InputStreamReader(

urlConnection.getInputStream(), encoding));// 得到輸入流，即獲得了網頁的內容

String line; // 讀取輸入流的數據，並缺兄顯示

while ((line = reader.readLine()) != null) {

System.out.println(line);

}

}

}

㈢ 急求JAVA源代碼，小游戲或者別的

//這是個聊天程序， 在ECLIPSE 運行 Client.java 就可以了。 連接是：localhost
//Server 代碼，

package message;
import java.io.*;
import java.net.*;
import java.util.*;
public class Server {

public static void main(String[] args) throws Exception{
System.out.print("Server");
ServerSocket socket=new ServerSocket(8888);
Vector v=new Vector();
while(true){
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 代碼
package message;
import java.net.*;
import java.io.*;
import java.util.*;
public class ServerThread extends Thread{

DataInputStream in;
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;i<all.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 代碼
package message;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
public class ClientFrame extends JFrame implements ActionListener{

JButton b1=new JButton ("SendMessage");
JButton b2=new JButton("Link Server");
JTextField t1=new JTextField(20);
JTextField t2=new JTextField(20);
JLabel l=new JLabel("輸入伺服器名字:");
JTextArea area=new JTextArea(10,20);
JPanel p1=new JPanel();
JPanel p2=new JPanel();
JPanel p3=new JPanel();
JPanel p4=new JPanel();
Socket socket;
public ClientFrame()
{
this.getContentPane().add(p1);
p2.add(new JScrollPane(area));
p3.add(t1);
p3.add(b1);
p4.add(l);
p4.add(t2);
p4.add(b2);

p2.setLayout(new FlowLayout());
p3.setLayout(new FlowLayout());
p4.setLayout(new FlowLayout());
p1.setLayout(new BorderLayout());
p1.add("North",p2);
p1.add("Center",p3);
p1.add("South",p4);
b1.addActionListener(this);
b2.addActionListener(this);

this.pack();
show();

}

public void actionPerformed(ActionEvent e)
{
if(e.getActionCommand().equals("Link Server"))
{
try{
socket=new Socket(t2.getText(),8888);
b2.setEnabled(false);
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"))
{

try{
DataOutputStream out=new DataOutputStream(socket.getOutputStream());
out.writeUTF(t1.getText());
t1.setText("");
}catch(Exception e1){e1.printStackTrace();};

}

}

}

//ClientThread.java 代碼

package message;
import java.net.*;
import java.io.*;
import javax.swing.*;
public class ClientThread extends Thread {
DataInputStream in;
JTextArea area;
public ClientThread(DataInputStream in,JTextArea area){
this.in=in;
this.area=area;
}
public void run()
{
while(true){
try{

String s=in.readUTF();
area.append(s);
}
catch(Exception e){e.printStackTrace();};
}
}

}

//Client.java代碼

package message;

public class Client {

/**
* @param args
*/
public static void main(String[] args) {
new ClientFrame();

}

}

// 每段代碼都是個類，不要弄在一個文件里。 運行 Client.java
good luck to you!

㈣ 求:java實例源代碼

import java.awt.*;
import java.awt.event.*;
import java.lang.*;
import javax.swing.*;
public class Counter extends Frame
{
//聲明三個面板的布局
GridLayout gl1,gl2,gl3;
Panel p0,p1,p2,p3;
JTextField tf1;
TextField tf2;
Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;
StringBuffer str;//顯示屏所顯示的字元串
double x,y;//x和y都是運算數
int z;//Z表示單擊了那一個運算符.0表示"+",1表示"-",2表示"*",3表示"/"
static double m;//記憶的數字
public Counter()
{
gl1=new GridLayout(1,4,10,0);//實例化三個面板的布局
gl2=new GridLayout(4,1,0,15);
gl3=new GridLayout(4,5,10,15);

tf1=new JTextField(27);//顯示屏
tf1.setHorizontalAlignment(JTextField.RIGHT);
tf1.setEnabled(false);
tf1.setText("0");
tf2=new TextField(10);//顯示記憶的索引值
tf2.setEditable(false);
//實例化所有按鈕、設置其前景色並注冊監聽器
b0=new Button("Backspace");
b0.setForeground(Color.red);
b0.addActionListener(new Bt());
b1=new Button("CE");
b1.setForeground(Color.red);
b1.addActionListener(new Bt());
b2=new Button("C");
b2.setForeground(Color.red);
b2.addActionListener(new Bt());
b3=new Button("MC");
b3.setForeground(Color.red);
b3.addActionListener(new Bt());
b4=new Button("MR");
b4.setForeground(Color.red);
b4.addActionListener(new Bt());
b5=new Button("MS");
b5.setForeground(Color.red);
b5.addActionListener(new Bt());
b6=new Button("M+");
b6.setForeground(Color.red);
b6.addActionListener(new Bt());
b7=new Button("7");
b7.setForeground(Color.blue);
b7.addActionListener(new Bt());
b8=new Button("8");
b8.setForeground(Color.blue);
b8.addActionListener(new Bt());
b9=new Button("9");
b9.setForeground(Color.blue);
b9.addActionListener(new Bt());
b10=new Button("/");
b10.setForeground(Color.red);
b10.addActionListener(new Bt());
b11=new Button("sqrt");
b11.setForeground(Color.blue);
b11.addActionListener(new Bt());
b12=new Button("4");
b12.setForeground(Color.blue);
b12.addActionListener(new Bt());
b13=new Button("5");
b13.setForeground(Color.blue);
b13.addActionListener(new Bt());
b14=new Button("6");
b14.setForeground(Color.blue);
b14.addActionListener(new Bt());
b15=new Button("*");
b15.setForeground(Color.red);
b15.addActionListener(new Bt());
b16=new Button("%");
b16.setForeground(Color.blue);
b16.addActionListener(new Bt());
b17=new Button("1");
b17.setForeground(Color.blue);
b17.addActionListener(new Bt());
b18=new Button("2");
b18.setForeground(Color.blue);
b18.addActionListener(new Bt());
b19=new Button("3");
b19.setForeground(Color.blue);
b19.addActionListener(new Bt());
b20=new Button("-");
b20.setForeground(Color.red);
b20.addActionListener(new Bt());
b21=new Button("1/X");
b21.setForeground(Color.blue);
b21.addActionListener(new Bt());
b22=new Button("0");
b22.setForeground(Color.blue);
b22.addActionListener(new Bt());
b23=new Button("+/-");
b23.setForeground(Color.blue);
b23.addActionListener(new Bt());
b24=new Button(".");
b24.setForeground(Color.blue);
b24.addActionListener(new Bt());
b25=new Button("+");
b25.setForeground(Color.red);
b25.addActionListener(new Bt());
b26=new Button("=");
b26.setForeground(Color.red);
b26.addActionListener(new Bt());

//實例化四個面板
p0=new Panel();
p1=new Panel();
p2=new Panel();
p3=new Panel();
//創建一個空字元串緩沖區
str=new StringBuffer();

//添加面板p0中的組件和設置其在框架中的位置和大小
p0.add(tf1);
p0.setBounds(10,25,300,40);
//添加面板p1中的組件和設置其在框架中的位置和大小
p1.setLayout(gl1);
p1.add(tf2);
p1.add(b0);
p1.add(b1);
p1.add(b2);
p1.setBounds(10,65,300,25);
//添加面板p2中的組件並設置其的框架中的位置和大小
p2.setLayout(gl2);
p2.add(b3);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.setBounds(10,110,40,150);
//添加面板p3中的組件並設置其在框架中的位置和大小
p3.setLayout(gl3);//設置p3的布局
p3.add(b7);
p3.add(b8);
p3.add(b9);
p3.add(b10);
p3.add(b11);
p3.add(b12);
p3.add(b13);
p3.add(b14);
p3.add(b15);
p3.add(b16);
p3.add(b17);
p3.add(b18);
p3.add(b19);
p3.add(b20);
p3.add(b21);
p3.add(b22);
p3.add(b23);
p3.add(b24);
p3.add(b25);
p3.add(b26);
p3.setBounds(60,110,250,150);
//設置框架中的布局為空布局並添加4個面板
setLayout(null);
add(p0);
add(p1);
add(p2);
add(p3);
setResizable(false);//禁止調整框架的大小
//匿名類關閉窗口
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e1)
{
System.exit(0);
}
});
setBackground(Color.lightGray);
setBounds(100,100,320,280);
setVisible(true);

}
//構造監聽器
class Bt implements ActionListener
{
public void actionPerformed(ActionEvent e2)
{
try{

if(e2.getSource()==b1)//選擇"CE"清零
{
tf1.setText("0");//把顯示屏清零
str.setLength(0);//清空字元串緩沖區以准備接收新的輸入運算數
}
else if(e2.getSource()==b2)//選擇"C"清零
{
tf1.setText("0");//把顯示屏清零
str.setLength(0);
}
else if(e2.getSource()==b23)//單擊"+/-"選擇輸入的運算數是正數還是負數
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(-x));
}
else if(e2.getSource()==b25)//單擊加號按鈕獲得x的值和z的值並清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);//清空緩沖區以便接收新的另一個運算數
y=0d;
z=0;
}
else if(e2.getSource()==b20)//單擊減號按鈕獲得x的值和z的值並清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=1;
}
else if(e2.getSource()==b15)//單擊乘號按鈕獲得x的值和z的值並清空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=2;
}
else if(e2.getSource()==b10)//單擊除號按鈕獲得x的值和z的值並空y的值
{
x=Double.parseDouble(tf1.getText().trim());
str.setLength(0);
y=0d;
z=3;
}
else if(e2.getSource()==b26)//單擊等號按鈕輸出計算結果
{
str.setLength(0);
switch(z)
{
case 0 : tf1.setText(""+(x+y));break;
case 1 : tf1.setText(""+(x-y));break;
case 2 : tf1.setText(""+(x*y));break;
case 3 : tf1.setText(""+(x/y));break;
}
}
else if(e2.getSource()==b24)//單擊"."按鈕輸入小數
{
if(tf1.getText().trim().indexOf(′.′)!=-1)//判斷字元串中是否已經包含了小數點
{

}
else//如果沒數點有小
{
if(tf1.getText().trim().equals("0"))//如果初時顯示為0
{
str.setLength(0);
tf1.setText((str.append("0"+e2.getActionCommand())).toString());
}
else if(tf1.getText().trim().equals(""))//如果初時顯示為空則不做任何操作
{
}
else
{
tf1.setText(str.append(e2.getActionCommand()).toString());
}
}

y=0d;

}
else if(e2.getSource()==b11)//求平方根
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText("數字格式異常");
if(x<0)
tf1.setText("負數沒有平方根");
else
tf1.setText(""+Math.sqrt(x));
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b16)//單擊了"%"按鈕
{
x=Double.parseDouble(tf1.getText().trim());
tf1.setText(""+(0.01*x));
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b21)//單擊了"1/X"按鈕
{

x=Double.parseDouble(tf1.getText().trim());
if(x==0)
{

tf1.setText("除數不能為零");
}
else
{
tf1.setText(""+(1/x));
}
str.setLength(0);
y=0d;
}
else if(e2.getSource()==b3)//MC為清除內存
{
m=0d;
tf2.setText("");
str.setLength(0);
}
else if(e2.getSource()==b4)//MR為重新調用存儲的數據
{
if(tf2.getText().trim()!="")//有記憶數字
{
tf1.setText(""+m);
}
}
else if(e2.getSource()==b5)//MS為存儲顯示的數據
{

m=Double.parseDouble(tf1.getText().trim());
tf2.setText("M");
tf1.setText("0");
str.setLength(0);
}
else if(e2.getSource()==b6)//M+為將顯示的數字與已經存儲的數據相加要查看新的數字單擊MR
{
m=m+Double.parseDouble(tf1.getText().trim());
}
else//選擇的是其他的按鈕
{
if(e2.getSource()==b22)//如果選擇的是"0"這個數字鍵
{
if(tf1.getText().trim().equals("0"))//如果顯示屏顯示的為零不做操作
{

}
else
{
tf1.setText(str.append(e2.getActionCommand()).toString());
y=Double.parseDouble(tf1.getText().trim());
}
}
else if(e2.getSource()==b0)//選擇的是「BackSpace」按鈕
{
if(!tf1.getText().trim().equals("0"))//如果顯示屏顯示的不是零
{
if(str.length()!=1)
{
tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能拋出字元串越界異常
}
else
{
tf1.setText("0");
str.setLength(0);
}
}
y=Double.parseDouble(tf1.getText().trim());
}
else//其他的數字鍵
{
tf1.setText(str.append(e2.getActionCommand()).toString());
y=Double.parseDouble(tf1.getText().trim());
}
}
}
catch(NumberFormatException e){
tf1.setText("數字格式異常");
}
catch( e){
tf1.setText("字元串索引越界");
}
}
}
public static void main(String args[])
{
new Counter();
}

}

㈤ 求JAVA源代碼 ~~~~！！！！！！

我給你一個計算器的源代碼，這個好講。自己前幾天寫的，已經被網路收錄了。
import java.awt.Button; import java.awt.Color; import java.awt.Frame; import java.awt.GridLayout; import java.awt.Panel; import java.awt.TextField; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; public class Calculator extends WindowAdapter implements MouseListener { private String first; private String second; private String operator; private Button zero = new Button("0"); private Button one = new Button("1"); private Button two = new Button("2"); private Button three = new Button("3"); private Button four = new Button("4"謹升); private Button five = new Button("5"); private Button six = new Button("6"); private Button seven = new Button("7"); private Button eight = new Button("8"); private Button nine = new Button("9"); private Button decimal = new Button("."); private Button equal = new Button("="); private Button add = new Button("+"); private Button sub = new Button("-"); private Button mul = new Button("*"); private Button div = new Button("/"); private TextField input = new TextField(); private Button CE = new Button("CE"); private Button DEL = new Button("Del"); 旦晌旦public static void main(String[] args) { new Calculator(); } public Calculator(){ Frame f = new Frame("Calculator"); f.add("North", input); Panel keys = new Panel(); f.add(keys, "Center"); keys.setLayout(new GridLayout(4, 4)); keys.add(seven); keys.add(eight); keys.add(nine); keys.add(add); keys.add(four); keys.add(five); keys.add(six); keys.add(sub); keys.add(one); keys.add(two); keys.add(three); keys.add(mul); keys.add(zero); 模擾keys.add(decimal); keys.add(equal); keys.add(div); zero.addMouseListener(this); one.addMouseListener(this); two.addMouseListener(this); three.addMouseListener(this); four.addMouseListener(this); five.addMouseListener(this); six.addMouseListener(this); seven.addMouseListener(this); eight.addMouseListener(this); nine.addMouseListener(this); add.addMouseListener(this); sub.addMouseListener(this); div.addMouseListener(this); mul.addMouseListener(this); equal.addMouseListener(this); decimal.addMouseListener(this); Panel addtionalPanel = new Panel(); addtionalPanel.setLayout(new GridLayout(1, 2)); addtionalPanel.add(CE); addtionalPanel.add(DEL); CE.setBackground(Color.green); DEL.setBackground(Color.cyan); CE.addMouseListener(this); DEL.addMouseListener(this); f.add("South", addtionalPanel); f.addWindowListener(this); f.setVisible(true); f.setLocation(200, 300); f.setSize(200, 200); } public void windowClosing(WindowEvent e) { System.exit(0); } public void mouseClicked(MouseEvent e) { Button btn = (Button) e.getSource(); String key = btn.getActionCommand().trim(); if(btn == one || btn == two || btn == three || btn == zero || btn == four || btn == five || btn == six || btn == seven || btn == eight || btn == nine){ if(isBlank(operator)){ if(isBlank(first)){ first = key; }else{ first += key; } input.setText(first); }else{ if(isBlank(second)){ second = key; }else{ second += key; } input.setText(second); } }else if(btn == decimal){ if(isBlank(operator)){ if(isBlank(first)){ first = "0."; input.setText(first); }else{ if(first.indexOf(".") == -1){ first += "."; input.setText(first); } } }else{ if(isBlank(second)){ second = "0."; input.setText(second); }else{ if(second.indexOf(".") == -1){ second += "."; input.setText(second); } } } }else if(btn == equal){ if(!isBlank(second) && !isBlank(first) && !isBlank(operator)){ double result = 0.0D; if(operator.equals("+")){ result = Double.parseDouble(first) + Double.parseDouble(second); }else if(operator.equals("-")){ result = Double.parseDouble(first) - Double.parseDouble(second); }else if(operator.equals("*")){ result = Double.parseDouble(first) * Double.parseDouble(second); }else if(operator.equals("/")){ result = Double.parseDouble(first) / Double.parseDouble(second); } int value = (int)Math.round(result); if(value == result){ input.setText(String.valueOf(value)); }else{ input.setText(String.valueOf(result)); } first = String.valueOf(result); second = null; operator = null; } }else if(btn == add || btn == sub || btn == div || btn == mul){ if(!isBlank(first)){ if(!isBlank(operator) && !isBlank(second)){ if(operator.equals("+")){ first = String.valueOf(Double.parseDouble(first) + Double.parseDouble(second)); }else if(operator.equals("-")){ first = String.valueOf(Double.parseDouble(first) - Double.parseDouble(second)); }else if(operator.equals("*")){ first = String.valueOf(Double.parseDouble(first) * Double.parseDouble(second)); }else if(operator.equals("/")){ first = String.valueOf(Double.parseDouble(first) / Double.parseDouble(second)); } second = null; } operator = key; } }else if(btn == CE){ first = null; second = null; operator = null; input.setText(null); }else if(btn == DEL){ if(isBlank(operator)){ if(!isBlank(first)){ first = first.substring(0, first.length() -1); input.setText(first); } }else{ if(!isBlank(second)){ second = second.substring(0, second.length() -1); input.setText(second); } } } } private boolean isBlank(String str){ return str == null || str.trim().equals(""); } public void mousePressed(MouseEvent e) {} public void mouseReleased(MouseEvent e) {} public void mouseEntered(MouseEvent e) {} public void mouseExited(MouseEvent e) {} }