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java源代碼范例 java的源代碼

高分求兩個簡單的JAVA設(shè)計源代碼

上面 wuzhikun12同學寫的不錯,但我想還不能運行,并且還不太完善。我給個能運行的:(注意:文件名為:Test.java)

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//要實現(xiàn)對象間的比較,就必須實現(xiàn)Comparable接口,它里面有個compareTo方法

//Comparable最好使用泛型,這樣,無論是速度還是代碼量都會減少

@SuppressWarnings("unchecked")

class Student implements ComparableStudent{

private String studentNo; //學號

private String studentName; //姓名

private double englishScore; //英語成績

private double computerScore; //計算機成績

private double mathScore; //數(shù)學成績

private double totalScore; //總成績

//空構(gòu)造函數(shù)

public Student() {}

//構(gòu)造函數(shù)

public Student(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

this.studentNo = studentNo;

this.studentName = studentName;

this.englishScore = englishSocre;

this點抗 puterScore = computerScore;

this.mathScore = mathScore;

}

//計算總成績

public double sum() {

this.totalScore = englishScore+computerScore+mathScore;

return totalScore;

}

//計算評測成績

public double testScore() {

return sum()/3;

}

//實現(xiàn)compareTO方法

@Override

public int compareTo(Student student) {

double studentTotal = student.getTotalScore();

return totalScore==studentTotal?0:(totalScorestudentTotal?1:-1);

}

//重寫toString方法

public String toString(){

return "學號:"+this.getStudentNo()+" 姓名:"+this.getStudentName()+" 英語成績:"+this.getEnglishScore()+" 數(shù)學成績:"+this.getMathScore()+" 計算機成績:"+this.getComputerScore()+" 總成績:"+this.getTotalScore();

}

//重寫equals方法

public boolean equals(Object obj) {

if(obj == null){

return false;

}

if(!(obj instanceof Student)){

return false;

}

Student student = (Student)obj;

if(this.studentNo.equals(student.getStudentName())) { //照現(xiàn)實來說,比較是不是同一個學生,應(yīng)該只是看他的學號是不是相同

return true;

} else {

return false;

}

}

/*以下為get和set方法,我個人認為,totalScore的set的方法沒必要要,因為它是由其它成績計算出來的

在set方法中,沒設(shè)置一次值,調(diào)用一次sum方法,即重新計算總成績

*/

public String getStudentNo() {

return studentNo;

}

public void setStudentNo(String studentNo) {

this.studentNo = studentNo;

sum();

}

public String getStudentName() {

return studentName;

}

public void setStudentName(String studentName) {

this.studentName = studentName;

sum();

}

public double getEnglishScore() {

return englishScore;

}

public void setEnglishScore(double englishScore) {

this.englishScore = englishScore;

sum();

}

public double getComputerScore() {

return computerScore;

}

public void setComputerScore(double computerScore) {

this點抗 puterScore = computerScore;

sum();

}

public double getMathScore() {

return mathScore;

}

public void setMathScore(double mathScore) {

this.mathScore = mathScore;

sum();

}

public double getTotalScore() {

return totalScore;

}

}

//Student子類學習委員類的實現(xiàn)

class StudentXW extends Student {

//重寫父類Student的testScore()方法

@Override

public double testScore() {

return sum()/3+3;

}

public StudentXW() {}

//StudentXW的構(gòu)造函數(shù)

public StudentXW(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

super(studentNo,studentName,englishSocre,computerScore,mathScore);

}

}

//Student子類班長類的實現(xiàn)

class StudentBZ extends Student {

//重寫父類Student的testScore()方法

@Override

public double testScore() {

return sum()/3+5;

}

public StudentBZ() {}

//StudentXW的構(gòu)造函數(shù)

public StudentBZ(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {

super(studentNo,studentName,englishSocre,computerScore,mathScore);

}

}

//測試類

public class Test {

public static void main(String[] args) {

//生成若干個student類、StudentXW類、StudentBZ類

Student student1 = new Student("s001","張三",70.5,50,88.5);

Student student2 = new Student("s002","李四",88,65,88.5);

Student student3 = new Student("s003","王五",67,77,90);

StudentXW student4 = new StudentXW("s004","李六",99,88,99.5);

StudentBZ student5 = new StudentBZ("s005","朱漆",56,65.6,43.5);

Student[] students = {student1,student2,student3,student4,student5};

for(int i = 0 ; istudents.length; i++){

double avgScore = students[i].testScore();

System.out.println(students[i].getStudentName()+"學生的評測成績?yōu)椋?+ avgScore+"分");

}

}

}

運行結(jié)果為:

張三學生的評測成績?yōu)椋?9.66666666666667分

李四學生的評測成績?yōu)椋?0.5分

王五學生的評測成績?yōu)椋?8.0分

李六學生的評測成績?yōu)椋?8.5分

朱漆學生的評測成績?yōu)椋?0.03333333333333分

用Java編寫簡易記事本源代碼

importjava.awt.BorderLayout;importjava.awt.Container;importjava.awt.Font;importjava.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjava.awt.event.InputEvent;importjava.awt.event.KeyAdapter;importjava.awt.event.KeyEvent;importjava.awt.event.MouseAdapter;importjava.awt.event.MouseEvent;importjava.awt.event.WindowAdapter;importjava.awt.event.WindowEvent;importjava.io.BufferedReader;importjava.io.BufferedWriter;importjava.io.File;importjava.io.FileReader;importjava.io.FileWriter;importjava.io.IOException;importjavax.swing.BorderFactory;importjavax.swing.JFileChooser;importjavax.swing.JFrame;importjavax.swing.JLabel;importjavax.swing.JMenu;importjavax.swing.JMenuBar;importjavax.swing.JMenuItem;importjavax.swing.JOptionPane;importjavax.swing.JPopupMenu;importjavax.swing.JScrollPane;importjavax.swing.JTextArea;importjavax.swing.KeyStroke;importjavax.swing.ScrollPaneConstants;importjavax.swing.SwingConstants;publicclassJNotePadUIextendsJFrame{privateJMenuItemmenuOpen;privateJMenuItemmenuSave;privateJMenuItemmenuSaveAs;privateJMenuItemmenuClose;privateJMenueditMenu;privateJMenuItemmenuCut;privateJMenuItemmenuCopy;privateJMenuItemmenuPaste;privateJMenuItemmenuAbout;privateJTextAreatextArea;privateJLabelstateBar;privateJFileChooserfileChooser;privateJPopupMenupopUpMenu;publicJNotePadUI(){super("新建文本文件");setUpUIComponent();setUpEventListener();setVisible(true);}privatevoidsetUpUIComponent(){setSize(640,480);//菜單欄JMenuBarmenuBar=newJMenuBar();//設(shè)置「文件」菜單JMenufileMenu=newJMenu("文件");menuOpen=newJMenuItem("打開");//快捷鍵設(shè)置menuOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));menuSave=newJMenuItem("保存");menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));menuSaveAs=newJMenuItem("另存為");menuClose=newJMenuItem("關(guān)閉");menuClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,InputEvent.CTRL_MASK));fileMenu.add(menuOpen);fileMenu.addSeparator();//分隔線fileMenu.add(menuSave);fileMenu.add(menuSaveAs);fileMenu.addSeparator();//分隔線fileMenu.add(menuClose);//設(shè)置「編輯」菜單JMenueditMenu=newJMenu("編輯");menuCut=newJMenuItem("剪切");menuCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));menuCopy=newJMenuItem("復制");menuCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));menuPaste=newJMenuItem("粘貼");menuPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));editMenu.add(menuCut);editMenu.add(menuCopy);editMenu.add(menuPaste);//設(shè)置「關(guān)于」菜單JMenuaboutMenu=newJMenu("關(guān)于");menuAbout=newJMenuItem("關(guān)于JNotePad");aboutMenu.add(menuAbout);menuBar.add(fileMenu);menuBar.add(editMenu);menuBar.add(aboutMenu);setJMenuBar(menuBar);//文字編輯區(qū)域textArea=newJTextArea();textArea.setFont(newFont("宋體",Font.PLAIN,16));textArea.setLineWrap(true);JScrollPanepanel=newJScrollPane(textArea,ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);ContainercontentPane=getContentPane();contentPane.add(panel,BorderLayout.CENTER);//狀態(tài)欄stateBar=newJLabel("未修改");stateBar.setHorizontalAlignment(SwingConstants.LEFT);stateBar.setBorder(BorderFactory.createEtchedBorder());contentPane.add(stateBar,BorderLayout.SOUTH);popUpMenu=editMenu.getPopupMenu();fileChooser=newJFileChooser();}privatevoidsetUpEventListener(){//按下窗口關(guān)閉鈕事件處理addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){closeFile();}});//菜單-打開menuOpen.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){openFile();}});//菜單-保存menuSave.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFile();}});//菜單-另存為menuSaveAs.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){saveFileAs();}});//菜單-關(guān)閉文件menuClose.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){closeFile();}});//菜單-剪切menuCut.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){cut();}});//菜單-復制menuCopy.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){copy();}});//菜單-粘貼menuPaste.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){paste();}});//菜單-關(guān)于menuAbout.addActionListener(newActionListener(){publicvoidactionPerformed(ActionEvente){//顯示對話框JOptionPane.showOptionDialog(null,"程序名稱:\nJNotePad\n"+"程序設(shè)計:\n\n"+"簡介:\n一個簡單的文字編輯器\n"+"可作為驗收Java的實現(xiàn)對象\n"+"歡迎網(wǎng)友下載研究交流\n\n"+"/","關(guān)于JNotePad",JOptionPane.DEFAULT_OPTION,JOptionPane.INFORMATION_MESSAGE,null,null,null);}});//編輯區(qū)鍵盤事件textArea.addKeyListener(newKeyAdapter(){publicvoidkeyTyped(KeyEvente){processTextArea();}});//編輯區(qū)鼠標事件textArea.addMouseListener(newMouseAdapter(){publicvoidmouseReleased(MouseEvente){if(e.getButton()==MouseEvent.BUTTON3)popUpMenu.show(editMenu,e.getX(),e.getY());}publicvoidmouseClicked(MouseEvente){if(e.getButton()==MouseEvent.BUTTON1)popUpMenu.setVisible(false);}});}privatevoidopenFile(){if(isCurrentFileSaved()){//文件是否為保存狀態(tài)open();//打開}else{//顯示對話框intoption=JOptionPane.showConfirmDialog(null,"文件已修改,是否保存?","保存文件?",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){//確認文件保存caseJOptionPane.YES_OPTION:saveFile();//保存文件break;//放棄文件保存caseJOptionPane.NO_OPTION:open();break;}}}privatebooleanisCurrentFileSaved(){if(stateBar.getText().equals("未修改")){returnfalse;}else{returntrue;}}privatevoidopen(){//fileChooser是JFileChooser的實例//顯示文件選取的對話框intoption=fileChooser.showDialog(null,null);//使用者按下確認鍵if(option==JFileChooser.APPROVE_OPTION){try{//開啟選取的文件BufferedReaderbuf=newBufferedReader(newFileReader(fileChooser.getSelectedFile()));//設(shè)定文件標題setTitle(fileChooser.getSelectedFile().toString());//清除前一次文件textArea.setText("");//設(shè)定狀態(tài)欄stateBar.setText("未修改");//取得系統(tǒng)相依的換行字符StringlineSeparator=System.getProperty("line.separator");//讀取文件并附加至文字編輯區(qū)Stringtext;while((text=buf.readLine())!=null){textArea.append(text);textArea.append(lineSeparator);}buf.close();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"開啟文件失敗",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFile(){//從標題欄取得文件名稱Filefile=newFile(getTitle());//若指定的文件不存在if(!file.exists()){//執(zhí)行另存為saveFileAs();}else{try{//開啟指定的文件BufferedWriterbuf=newBufferedWriter(newFileWriter(file));//將文字編輯區(qū)的文字寫入文件buf.write(textArea.getText());buf.close();//設(shè)定狀態(tài)欄為未修改stateBar.setText("未修改");}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"寫入文件失敗",JOptionPane.ERROR_MESSAGE);}}}privatevoidsaveFileAs(){//顯示文件對話框intoption=fileChooser.showSaveDialog(null);//如果確認選取文件if(option==JFileChooser.APPROVE_OPTION){//取得選擇的文件Filefile=fileChooser.getSelectedFile();//在標題欄上設(shè)定文件名稱setTitle(file.toString());try{//建立文件file.createNewFile();//進行文件保存saveFile();}catch(IOExceptione){JOptionPane.showMessageDialog(null,e.toString(),"無法建立新文件",JOptionPane.ERROR_MESSAGE);}}}privatevoidcloseFile(){//是否已保存文件if(isCurrentFileSaved()){//釋放窗口資源,而后關(guān)閉程序dispose();}else{intoption=JOptionPane.showConfirmDialog(null,"文件已修改,是否保存?","保存文件?",JOptionPane.YES_NO_OPTION,JOptionPane.WARNING_MESSAGE,null);switch(option){caseJOptionPane.YES_OPTION:saveFile();break;caseJOptionPane.NO_OPTION:dispose();}}}privatevoidcut(){textArea.cut();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidcopy(){textArea.copy();popUpMenu.setVisible(false);}privatevoidpaste(){textArea.paste();stateBar.setText("已修改");popUpMenu.setVisible(false);}privatevoidprocessTextArea(){stateBar.setText("已修改");}publicstaticvoidmain(String[]args){newJNotePadUI();}}

求編寫一個超級簡單的Java的程序源代碼

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class Login {

public static void main(String args[]) {

LoginFrm frame = new LoginFrm();

}

}

class LoginFrm extends JFrame implements ActionListener{

JLabel nameLabel=new JLabel("用戶名:");

JLabel pwdLabel=new JLabel("密碼:");

JTextField name=new JTextField(10);

JPasswordField password=new JPasswordField(10);

JButton butnSure=new JButton("確定");

JButton butnCancel=new JButton("取消");

public LoginFrm() {

super("登陸");

setBounds(500, 200, 280, 220);

setVisible(true);

setLayout(null);

nameLabel.setBounds(45, 20, 100, 25);

add(nameLabel);

add(name);

name.setBounds(105, 20, 110, 25);

add(pwdLabel);

pwdLabel.setBounds(45, 60, 100, 25);

add(password);

password.setBounds(105, 60, 110, 25);

add(butnSure);

butnSure.setBounds(45, 100, 80, 25);

add(butnCancel);

butnCancel.setBounds(135, 100, 80, 25);

butnSure.addActionListener(this);

butnCancel.addActionListener(this);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

validate();//刷新

}

public void actionPerformed(ActionEvent e) {

if (e.getSource() ==butnSure){

System.out.println("用戶名:"+name.getText());

System.out.println("密碼:"+name.getText());

if("admin".equals(name.getText().trim())"123".equals(password.getText().trim())){

this.dispose();

new MainFrm("用戶界面",name.getText().trim(),password.getText().trim());

}else {

JOptionPane.showMessageDialog(this, "用戶不存在");

}

}else if(e.getSource()==butnCancel){

System.exit(1);

}

}

class MainFrm extends JFrame{

private JLabel info;

public MainFrm(String s,String name,String password) {

super(s);

setBounds(400, 200, 500, 400);

setLayout(new FlowLayout());

info=new JLabel("登陸成功,用戶名:"+name+",密碼:"+password);

add(info);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

validate();

}

}

}


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