怎么用java编写一个程序？ 怎样用JAVA编写一个程序：

\u600e\u6837\u7528java\u7f16\u5199\u4e00\u4e2a\u7a0b\u5e8f\uff1f

import java.awt.*;
import java.awt.event.*;
class MyDow extends Frame implements ActionListener{
private Label lName,lPassword;
private TextField tName,tPassword;
private Button login,rest,exitout;
private Label login_clew;
private int count=0;
private String myName="nihao";
private String myPassword="5201314";
public void setMyNP(String n,String p){
myName=n;
myPassword=p;
}
public MyDow(String str){
super(str);
}
public void init(){
setLayout(null);
setSize(400,300);
setVisible(true);
setResizable(false);

lName=new Label("\u59d3\u540d");
lName.setBounds(50, 70, 60, 30);add(lName);
lPassword=new Label("\u5bc6\u7801");
lPassword.setBounds(50, 120, 60, 30);add(lPassword);
tName=new TextField("");
tName.setBounds(110, 70, 200, 30);add(tName);
tPassword=new TextField("");
tPassword.setBounds(110, 120, 200, 30);add(tPassword);
login=new Button("\u767b\u5f55");
login.setBounds(90, 200, 60, 30);add(login);
rest=new Button("\u91cd\u8f93");
rest.setBounds(170, 200, 60, 30);add(rest);
exitout=new Button("\u9000\u51fa");
exitout.setBounds(250,200,60,30);add(exitout);
login_clew=new Label("");

login.addActionListener(this);
rest.addActionListener(this);
exitout.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==login){
if(count<2){
if(tName.getText().equalsIgnoreCase(myName)&&tPassword.getText().equalsIgnoreCase(myPassword)){
removeAll();
add(login_clew);
add(exitout);
exitout.setLabel("\u786e\u5b9a");
login_clew.setBounds(160,120,200,30);
login_clew.setText("\u6b22\u8fceXX\u7528\u6237\uff01");
exitout.setBounds(170,220,60,30);
}else{
add(login_clew);
login_clew.setBounds(90,160,200,30);
login_clew.setText("\u8bf7\u8f93\u5165\u6b63\u786e\u7684\u4fe1\u606f\uff01");
count++;
}
}else{
add(login_clew);
login_clew.setBounds(90,160,200,30);
login_clew.setText("\u4f60\u8f93\u5165\u7684\u6b21\u6570\u8fbe\u5230\u4e863\u6b21\uff0c\u4e0d\u80fd\u767b\u5f55\u4e86\uff01");
}
}else if(e.getSource()==exitout){
System.exit(1);
}else{
lName.setText("");
lPassword.setText("");
}
}
}
public class UserLogin {
public static void main(String args[]){
MyDow m=new MyDow("\u767b\u5f55\u7a97\u53e3");
m.init();
}
}

Java\u662f\u4e00\u79cd\u53ef\u4ee5\u64b0\u5199\u8de8\u5e73\u53f0\u5e94\u7528\u8f6f\u4ef6\u7684\u9762\u5411\u5bf9\u8c61\u7684\u7a0b\u5e8f\u8bbe\u8ba1\u8bed\u8a00\u3002Java \u6280\u672f\u5177\u6709\u5353\u8d8a\u7684\u901a\u7528\u6027\u3001\u9ad8\u6548\u6027\u3001\u5e73\u53f0\u79fb\u690d\u6027\u548c\u5b89\u5168\u6027\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8ePC\u3001\u6570\u636e\u4e2d\u5fc3\u3001\u6e38\u620f\u63a7\u5236\u53f0\u3001\u79d1\u5b66\u8d85\u7ea7\u8ba1\u7b97\u673a\u3001\u79fb\u52a8\u7535\u8bdd\u548c\u4e92\u8054\u7f51\uff0c\u540c\u65f6\u62e5\u6709\u5168\u7403\u6700\u5927\u7684\u5f00\u53d1\u8005\u4e13\u4e1a\u793e\u7fa4\u3002
\u4efb\u4f55\u5355\u4f4d\u4efb\u4f55\u4e8b\u60c5\uff0c\u9996\u5148\u5f3a\u8c03\u7684\u5c31\u662f\u7a0b\u5e8f\uff0c\u56e0\u4e3a\u7ba1\u7406\u754c\u6709\u53e5\u540d\u8a00:\u7ec6\u8282\u51b3\u5b9a\u6210\u8d25\u3002\u7a0b\u5e8f\u5c31\u662f\u6574\u6cbb\u7ec6\u8282\u6700\u597d\u7684\u5de5\u5177\u3002\u4e8e\u662f\uff0c\u73b0\u5728\u6211\u4eec\u7684\u6240\u6709\u5de5\u4f5c\uff0c\u65e0\u65f6\u65e0\u5904\u4e0d\u5728\u5f3a\u8c03\u7a0b\u5e8f\u3002\u56e0\u4e3a\u6709\u4e86\u89c4\u8303\u7684\u529e\u4e8b\u7a0b\u5e8f\uff0c\u73b0\u5728\u6211\u4eec\u8fd9\u4e9b\u5e73\u6c11\u767e\u59d3\u5230\u653f\u5e9c\u673a\u5173\u529e\u4e8b\u6bd4\u539f\u6765\u5bb9\u6613\u4e86\u8bb8\u591a\uff0c\u6700\u8d77\u7801\u77e5\u9053\u529e\u4ec0\u4e48\u4e8b\u8be5\u627e\u54ea\u4e2a\u90e8\u95e8\uff0c\u77e5\u9053\u529e\u8fd9\u4e2a\u4e8b\u5e94\u8be5\u7528\u591a\u957f\u65f6\u95f4\u4e86\u3002
\u653f\u5e9c\u516c\u5f00\u529e\u4e8b\u7a0b\u5e8f\uff0c\u4e5f\u62c9\u8fd1\u4e86\u548c\u4eba\u6c11\u7fa4\u4f17\u7684\u5173\u7cfb\u3002\u597d\uff0c\u8fd9\u662f\u597d\u5f97\u5f88\u7684\u4e8b\u3002\u597d\u50cf\u662f\u4e3a\u4e86\u5370\u8bc1\u4e8b\u7269\u90fd\u662f\u4e00\u5206\u4e3a\u4e8c\u7684\u9053\u7406\u4e00\u6837\uff0c\u5728\u8d5e\u9882\u7a0b\u5e8f\u7684\u540c\u65f6\uff0c\u6211\u4eec\u4e5f\u770b\u5230\u4e86\u7a0b\u5e8f\u51b7\u9177\u7684\u53e6\u4e00\u9762\u3002\u5357\u5b81\u89c1\u4e49\u52c7\u4e3a\u7684\u82f1\u96c4\u9c8d\u5149\u86c7\u5728\u533b\u9662\u51b7\u9177\u7684\u7a0b\u5e8f\u4e2d\u6d41\u5c3d\u4e86\u6700\u540e\u4e00\u6ef4\u8840\uff0c\u516c\u8def\u6536\u8d39\u7ad9\u7684\u503c\u73ed\u4eba\u5458\u56e0\u6551\u62a4\u8f66\u4ea4\u4e0d\u51fa\u5341\u5143\u94b1\u7684\u8fc7\u8def\u8d39\u800c\u575a\u51b3\u4e0d\u653e\u884c\u6551\u62a4\u8f66\uff0c\u7ec8\u4e8e\u4f7f\u6025\u9700\u6551\u52a9\u7684\u60a3\u8005\u4e27\u547d\uff0c\u2026\u2026\u7b49\u7b49\u7684\u4f8b\u5b50\uff0c\u90fd\u4e3a\u6211\u4eec\u5f3a\u8c03\u6216\u8005\u8bf4\u5949\u4e3a\u795e\u5723\u89c4\u5219\u7684\u7a0b\u5e8f\u4f18\u5148\u52fe\u753b\u51fa\u4e86\u5b83\u7684\u539f\u5f62\u3002
\u7a0b\u5e8f\uff0c\u662f\u7ba1\u7406\u65b9\u5f0f\u7684\u4e00\u79cd\uff0c\u662f\u80fd\u591f\u53d1\u6325\u51fa\u534f\u8c03\u9ad8\u6548\u4f5c\u7528\u7684\u5de5\u5177\uff0c\u5728\u6211\u4eec\u7684\u793e\u4f1a\u4e3b\u4e49\u5efa\u8bbe\u4e8b\u4e1a\u6216\u8005\u8bf4\u73b0\u4ee3\u5316\u5efa\u8bbe\u4e2d\uff0c\u5e94\u8be5\u5145\u5206\u91cd\u89c6\u5b83\u7684\u4f5c\u7528\uff0c\u5e94\u8be5\u4e0d\u65ad\u5730\u5c06\u6211\u4eec\u7684\u5de5\u4f5c\u4ece\u65e0\u5e8f\u6574\u6539\u5230\u6709\u5e8f\u3002
\u53ef\u662f\uff0c\u5f53\u6211\u4eec\u53ea\u5173\u6ce8\u5f62\u5f0f\u800c\u4e0d\u5173\u6ce8\u5b9e\u8d28\u7684\u65f6\u5019\uff0c\u6709\u4e9b\u4e8b\u60c5\u5c31\u53d1\u5c55\u5230\u4e86\u5b83\u7684\u53cd\u9762\u3002\u7a0b\u5e8f\u4e0d\u662f\u533b\u6cbb\u767e\u75c5\u7684\u7075\u4e39\u5999\u836f\uff0c\u5728\u5b83\u8d70\u5411\u53cd\u9762\u7684\u65f6\u5019\uff0c\u5b83\u662f\u4f7f\u90a3\u4e9b\u5b98\u50da\u4e3b\u4e49\u8005\u548c\u89c6\u52b3\u82e6\u5927\u4f17\u5229\u76ca\u5982\u4e0d\u89c1\u7684\u4eba\u4eec\u63a8\u8131\u6389\u81ea\u5df1\u5e94\u5f53\u627f\u62c5\u7684\u8d23\u4efb\u7684\u6700\u597d\u7684\u6321\u7bad\u724c\u3002\u56e0\u4e3a\u8d8a\u662f\u4e25\u5bc6\u5b8c\u5584\u7684\u7a0b\u5e8f\uff0c\u6309\u90e8\u5c31\u73ed\u6267\u884c\u8d77\u6765\u8d8a\u662f\u8981\u4ed8\u51fa\u65f6\u95f4\u7684\u4ee3\u4ef7\uff0c\u5f53\u65f6\u95f4\u88ab\u6d6a\u8d39\u4e86\u65f6\u5019\uff0c\u56e0\u6b64\u5f15\u53d1\u7684\u5176\u4ed6\u635f\u5931\u662f\u4e0d\u5e94\u8be5\u7531\u6a21\u8303\u6267\u884c\u4e86\u7a0b\u5e8f\u7684\u4eba\u6765\u8d1f\u8d23\u7684\u3002

//1.\u521b\u5efa\u4e00\u4e2a\u5b66\u751f\u7c7b\uff0c\u8981\u6c42\u5177\u6709\u59d3\u540d\u3001\u5e74\u9f84\u3001\u5b66\u53f7\u3001\u5bc6\u7801\u3001\u6027\u522b\u3001\u5bf9\u8c61\u7684\u521b\u5efa\u65f6\u95f4\u51e0\u4e2a\u5c5e\u6027public class Students {
private int stu_id;
private String stu_name;
private int stu_age;
private String stu_pwd;
private String stu_sex;
private String stu_date;
public Students() {}
public Students(int id,String name,int age,String pwd,String sex,String date) {
this.stu_id = id;
this.stu_name = name;
this.stu_age = age;
this.stu_pwd = pwd;
this.stu_sex = sex;
this.stu_date = date;
}
public int getStu_age() {
return stu_age;
}
public void setStu_age(int stu_age) {
this.stu_age = stu_age;
}
public String getStu_date() {
return stu_date;
}
public void setStu_date(String stu_date) {
this.stu_date = stu_date;
}
public int getStu_id() {
return stu_id;
}
public void setStu_id(int stu_id) {
this.stu_id = stu_id;
}
public String getStu_name() {
return stu_name;
}
public void setStu_name(String stu_name) {
this.stu_name = stu_name;
}
public String getStu_pwd() {
return stu_pwd;
}
public void setStu_pwd(String stu_pwd) {
this.stu_pwd = stu_pwd;
}
public String getStu_sex() {
return stu_sex;
}
public void setStu_sex(String stu_sex) {
this.stu_sex = stu_sex;
}
}//\u5b66\u751f\u5217\u8868\u7c7bimport java.util.Vector;public class StuList { private Vector v = new Vector();
public static void main(String[] args) {
StuList sl = new StuList();
sl.getStu();
Vector v = sl.getSort();
for(int i=0;i<v.size();i++) {
int id = v.get(i).getStu_id();
String name = v.get(i).getStu_name();
int age = v.get(i).getStu_age();
String pwd = v.get(i).getStu_pwd();
String sex = v.get(i).getStu_sex();
String date = v.get(i).getStu_date();
System.out.println(id+","+name+","+age+","+pwd+","+sex+","+date);
}
} //2.\u521b\u5efa\u591a\u4e2a\u5b66\u751f\u7c7b\u7684\u5bf9\u8c61\uff08\u81f3\u5c1110\u4e2a\u4ee5\u4e0a\uff09\uff0c\u521b\u5efa\u4e00\u4e2a\u96c6\u5408\uff0c\u5c06\u8fd9\u4e9b\u5bf9\u8c61\u653e\u5165\u96c6\u5408\u3002
public Vector getStu() {
v.add(new Students(1001,"A",25,"aa","\u7537","2011-01-26"));
v.add(new Students(1002,"B",22,"bb","\u7537","2011-01-26"));
v.add(new Students(1003,"C",24,"cc","\u7537","2011-01-26"));
v.add(new Students(1004,"D",20,"dd","\u7537","2011-01-26"));
v.add(new Students(1005,"E",19,"ee","\u7537","2011-01-26"));
v.add(new Students(1006,"F",20,"ff","\u7537","2011-01-26"));
v.add(new Students(1007,"G",21,"gg","\u7537","2011-01-26"));
v.add(new Students(1008,"H",20,"hh","\u7537","2011-01-26"));
v.add(new Students(1009,"I",23,"ii","\u7537","2011-01-26"));
v.add(new Students(1010,"J",20,"jj","\u7537","2011-01-26"));
return v;
}/*3.\u5bf9\u96c6\u5408\u4e2d\u7684\u5b66\u751f\u5bf9\u8c61\u8fdb\u884c\u6392\u5e8f\uff0c\u6392\u5e8f\u8981\u6c42\u4e3a\u5148\u6309\u5e74\u9f84\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff0c\u5f53\u4e24\u540d\u5b66\u751f\u7684\u5e74\u9f84\u76f8\u540c\u65f6\u5728\u6309\u8fd9\u4e24\u540d\u5b66\u751f\u7684\u5b66\u53f7\u7531\u4f4e\u5230\u9ad8\u6392\u5e8f\u3002*/
public Vector getSort() {
for(int i=0;i<v.size()-1;i++) {
for(int j=i+1;j<v.size();j++) {
if(v.get(i).getStu_age()>v.get(j).getStu_age()){
Students temp = v.get(i);
v.insertElementAt(v.get(j),i);
v.remove(i+1);
v.insertElementAt(temp, j);
v.remove(j+1);
}
else if(v.get(i).getStu_age()==v.get(j).getStu_age()){
if(v.get(i).getStu_id()>v.get(j).getStu_id()){
Students temp = v.get(i);
v.insertElementAt(v.get(j),i);
v.remove(i+1);
v.insertElementAt(temp, j);
v.remove(j+1);
}
}
}
}
return v;
}
}
4.\u518d\u521b\u5efa\u4e00\u6279\u5bf9\u8c61\uff0c\u5c06\u8fd9\u4e9b\u5bf9\u8c61\u6309\u7167\u4e0a\u4f8b\u4e2d\u7684\u6392\u5e8f\u89c4\u5219\u63d2\u5165\u5230\u8be5\u96c6\u5408\u9002\u5f53\u7684\u4f4d\u7f6e\uff08\u8981\u6c42\u8003\u8651\u63d2\u5165\u901f\u5ea6\uff09
\u7b2c4\u662f\u91cd\u590d2,3\u7684\u6b65\u9aa4\u518d\u505a\u4e00\u904d\uff0c\u6211\u5c31\u4e0d\u91cd\u590d\u5199\u4e86

为了在您的机器上配置起一个Java开发环境——您将使用一个“开发环境”来“开发”（编写）程序——您需要完成以下这些步骤：

1.下载一个包含Java开发环境（编译器和其他工具）的大文件。点击“下载J2SE SDK”链接下载SDK（软件开发工具包）软件。网页会显示一个许可协议。点击“接受”。选择您的操作系统，然后将文件保存到下载目录中。这是一个巨大的文件，用电话调制解调器下载需要好几个小时。接下来的两个文件也很大。

2.下载一个包含Java文档的大文件。选择操作系统后点击SDK1.4.1文档的链接。

3.如果您的机器上还没有安装WinZip（或可执行相同功能的程序），那么您需要下载一个包含WinZip的大文件并安装之。如果您的机器上没有安装某个的版本的WinZip或其他解压缩软件，下载WinZip的试用版。运行EXE文件安装。很快我们将使用它来安装文档。

4.安装Java开发环境。运行第一步下载的j2sdk-1_4_1-*.exe文件。他将自动解压并安装开发工具包。

5.安装文档。阅读安装说明文档。它会要求您将文档文件移至刚才开发工具包的安装目录。将文档解压缩，文件就会被安排到适当的位置。

6.调整环境变量。按照此页的要求，您需要改变路径变量。最简单的办法是打开一个MS-DOS窗口键入PATH看看当前的路径变量是什么，然后用记事本打开autoexec.bat按要求修改PATH环境变量。

7.全面测试。现在您应该可以打开另一个MS-DOS窗口并键入javac了。

濡備綍鐢╦ava缂栧啓涓涓寰幆绋嬪簭?
绛旓細import java.util.*;public class Main { public static void main (String [] args) { Scanner s=new Scanner(System.in);int sum=0;int x=s.nextInt();while(x!=0) { if(x%2==1) { sum+=x;} x=s.nextInt();} System.out.println(sum);} } 杩愯鏁堟灉锛...

java鎬庝箞鍐
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濡備綍缂栧啓java绋嬪簭
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