编写一个Java Application程序

import javautilScanner;

public class Input {

public static void main(String[] args) {

Scanner sc = new Scanner(Systemin);

String str = "";

Systemoutprintln("请输入，以quit退出");

while(true){

str = scnext();

if("quit"equals(strtrim()toLowerCase())){

break;

}else{

Systemoutprintln("继续输入！");

}

}

Systemoutprintln("应用程序结束！");

}

}

/

学生类

@author Shurrik

/

public class Student {

private String sid;

private String sname;

private int sage;

private char gender;

private String specialty;

private int grade;

public Student(String sid, String sname, int sage, char gender,

String specialty, int grade) {

super();

thissid = sid;

thissname = sname;

thissage = sage;

thisgender = gender;

thisspecialty = specialty;

thisgrade = grade;

}

public String getSid() {

return sid;

}

public void setSid(String sid) {

thissid = sid;

}

public String getSname() {

return sname;

}

public void setSname(String sname) {

thissname = sname;

}

public int getSage() {

return sage;

}

public void setSage(int sage) {

thissage = sage;

}

public char getGender() {

return gender;

}

public void setGender(char gender) {

thisgender = gender;

}

public String getSpecialty() {

return specialty;

}

public void setSpecialty(String specialty) {

thisspecialty = specialty;

}

public int getGrade() {

return grade;

}

public void setGrade(int grade) {

thisgrade = grade;

}

}

----------------------偶是分割线------------------------

import javaioBufferedReader;

import javaioBufferedWriter;

import javaioFile;

import javaioFileNotFoundException;

import javaioFileReader;

import javaioFileWriter;

import javaioIOException;

/

学生管理者类

@author Shurrik

/

public class StudentManager {

private String filePath;

private Student stu;

public StudentManager(String filePath,Student stu) {

thisfilePath = filePath;

thisstu = stu;

}

/

按学号读取并返回学生信息

@param sid 学号

@return 学生信息

/

public String loadStudentInfo(String sid) {

File StudentInfoFile = new File(thisfilePath+"\\"+sid+"txt");

String StudentInfo = "";

try {

FileReader fr = new FileReader(StudentInfoFile);

BufferedReader reader = new BufferedReader(fr);

String line = "";

while((line = readerreadLine()) != null){

StudentInfo += line+"\r\n";

}

} catch (FileNotFoundException e) {

eprintStackTrace();

} catch (IOException e) {

eprintStackTrace();

}

return StudentInfo;

}

/

保存学生信息以文本文档的形式存入硬盘中

/

public void saveStudentInfo() {

File StudentInfoFile = new File(thisfilePath+"\\"+stugetSid()+"txt");

try {

FileWriter fw = new FileWriter(StudentInfoFile);

BufferedWriter writer = new BufferedWriter(fw);

writerwrite("学号："+stugetSid()+"\r\n");

writerwrite("姓名："+stugetSname()+"\r\n");

writerwrite("年龄："+stugetSage()+"\r\n");

writerwrite("性别："+stugetGender()+"\r\n");

writerwrite("专业："+stugetSpecialty()+"\r\n");

writerwrite("成绩："+stugetGrade());

writerclose();

fwclose();

} catch (IOException e) {

eprintStackTrace();

}

}

}

----------------------偶是分割线------------------------

import javaioFile;

/

测试类

@author Shurrik

/

public class Test {

public static void main(String[] args) {

Student stu = new Student("S2010001", "Jack", 21, '男', "Java", 94);

String filePath = "D:\\StudentInfo";

File folder = new File(filePath);

if(!folderexists()){

foldermkdirs();

}

StudentManager manager = new StudentManager(filePath, stu);

managersaveStudentInfo();

String StudentInfo = managerloadStudentInfo("S2010001");

Systemoutprintln(StudentInfo);

}

}

基本满足了你的要求，其他功能很容易扩展，自己写写看吧。

import javaawteventActionEvent;

import javaawteventActionListener;

import javaxswingJButton;

import javaxswingJFrame;

import javaxswingJLabel;

import javaxswingJTextArea;

import javaxswingJTextField;

import javaxswingWindowConstants;

public class SushuPanel extends javaxswingJPanel {

private JTextArea output;

private JTextField input;

private JButton ok;

private JLabel jLabel1;

/

Auto-generated main method to display this

JPanel inside a new JFrame

/

public static void main(String[] args) {

JFrame frame = new JFrame();

framegetContentPane()add(new SushuPanel());

framesetDefaultCloseOperation(WindowConstantsDISPOSE_ON_CLOSE);

framepack();

framesetVisible(true);

}

public SushuPanel() {

super();

initGUI();

}

private void initGUI() {

try {

thissetPreferredSize(new javaawtDimension(400, 197));

thissetLayout(null);

thissetBackground(new javaawtColor(148,179,77));

{

output = new JTextArea();

thisadd(output);

outputsetBounds(12, 12, 376, 127);

}

{

input = new JTextField();

thisadd(input);

inputsetBounds(72, 151, 163, 22);

}

{

jLabel1 = new JLabel();

thisadd(jLabel1);

jLabel1setText("请输入：");

jLabel1setBounds(22, 155, 61, 15);

}

{

ok = new JButton();

thisadd(ok);

oksetText("判断并输出");

oksetBounds(255, 151, 133, 22);

okaddActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

String info="";

try{

String text=inputgetText();

if(textequals(""))return;

int i=IntegerparseInt(text);

int s=(int) Mathsqrt(i);

boolean issushu=true;

for(;s>1;s--){

if(i%s==0){

issushu=false;

break;

}

}

info=text+(issushu" 为素数":"不是素数");

textreplace(""," ");

info+="\n";

info+=textreplace(""," ")trim();

}catch(NumberFormatException ex){

info="对不起，请输入数字";

}

outputsetText(info);

}});

}

} catch (Exception e) {

eprintStackTrace();

}

}

}

Application 程序如下：

public class Welcome {

public static void main(String[] args)

{

Systemoutprintln("欢迎来到java编程世界");

}

}

Applet 程序如下：

import javaawtContainer;

import javaxswingJLabel;

import javaxswingJApplet;

import javaxswingJButton;

import javaxswingJPanel;

public class WelcomeApplet extends JApplet

{

public void init()

{

Container con = getContentPane();

JPanel panel = new JPanel();

JLabel label = new JLabel("欢迎来到java编程世界");

paneladd(label);

JButton okButton = new JButton("OK");

paneladd(okButton);

conadd(panel);

}

}

把源文件编译成class文件，再创建一个HTML文件，代码如下：

<applet code="WelcomeAppletclass" width=300 height=100>

</applet>

//:SaveContentsjava

import javaawtevent;

import javaio;

import javaxswing;

public class SaveContents extends JFrame implements ActionListener{

public static void main(String[] args) {new SaveContents()setVisible(true);}

private JTextField cont;

private JButton save;

private String filePath="c:/conttxt";//文件的路径

public SaveContents(){

thissetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

thisgetContentPane()setLayout(null);

thissetSize(205,130);

thissetLocationRelativeTo(null);

cont = new JTextField();

contsetBounds(10,10,180,20);

add(cont);

save=new JButton("Save");

savesetBounds(110,50,78,22);

add(save);

saveaddActionListener(this);

}

public void actionPerformed(ActionEvent e) {

try {save();} catch (Exception e1) {}

}

//保存内容

private void save() throws Exception{

File f = new File(filePath);

FileWriter fw = new FileWriter(f);

fwwrite(contgetText());

fwflush();

fwclose();

}

}

import javaio;

import javautil;

import javatext;

class CreateFile{

static public void main(String[] str) throws IOException{

File root=new File("D:/");

SimpleDateFormat mat=new SimpleDateFormat

("yyyy-MM-dd hh:mm:ss");

for(int i=0;i<101010;i++){

String name=StringvalueOf((int)Mathrandom()123456)+"txt";

File temp=new File(root,name);

tempcreateNewFile();

PrintWriter p=new PrintWriter(temp);

pprintln(matformat(new Date()));

pclose();

}

}

}

新建类CloseFramejava，代码如下：

import javaawtBorderLayout;

import javaawtFlowLayout;

import javaawteventActionEvent;

import javaawteventActionListener;

import javaxswingJButton;

import javaxswingJFrame;

import javaxswingJMenu;

import javaxswingJMenuBar;

import javaxswingJMenuItem;

import javaxswingJPanel;

public class CloseFrame extends JFrame implements ActionListener {

JMenuBar menu;

JMenu file;

JMenuItem closeMenu;

public CloseFrame() {

menu = new JMenuBar();

file = new JMenu("文件");

closeMenu = new JMenuItem("关闭");

closeMenuaddActionListener(this);

JButton closeButton = new JButton(" 关闭 ");

closeButtonaddActionListener(this);

JPanel closePanel = new JPanel();

closePanelsetLayout(new FlowLayout());

closePaneladd(closeButton);

thisadd(closePanel, BorderLayoutCENTER);

thisadd(menu, BorderLayoutNORTH);

menuadd(file);

fileadd(closeMenu);

thissetBounds(200, 100, 200, 120);

thissetVisible(true);

thissetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);

}

public void actionPerformed(ActionEvent e) {

Systemexit(0);

}

public static void main(String[] args) {

new CloseFrame();

}

}

运行结果如下：

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