java 源代码 基础点的 谢谢
发布网友
发布时间：2022-05-11 03:57
共5个回答
热心网友
时间：2024-02-08 22:54
import java.io.*;
import java.net.URLDecoder;
import java.util.regex.*;
public class Regex {
private int REMARK=0;
private int LOGIC=0;
private int PHYSIC=0;
boolean start=false;
/**
* @param args
*/
public static void main(String[] args) { //测试方法
// TODO Auto-generated method stub
Regex re=new Regex();
re.regCount("Regex.java");
System.out.println("remark Line: "+re.REMARK);
System.out.println("logic Line: "+re.LOGIC);
System.out.println("physic Line: "+re.PHYSIC);
}/**
* @author BlueDance
* @param s
* @deprecated count
*/
public void regCount(String s){
String url=null;
try {
url=URLDecoder.decode(this.getClass().getResource(s).getPath(),"UTF-8");
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
try {
BufferedReader br=new BufferedReader(new FileReader(new File(url)));
String s1=null;
while((s1=br.readLine())!=null){
PHYSIC++;
if(CheckChar(s1)==1){
REMARK++;
System.out.println("纯注释行："+s1);
}
if(CheckChar(s1)==2){
LOGIC++;
REMARK++;
System.out.println("非纯注释行："+s1);
}
if(CheckChar(s1)==3)
LOGIC++;
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch(IOException e){
e.printStackTrace();
}
}
/**
*
* @param s
* @return int
* @version check s
*/
public int CheckChar(String s){
String s1=null;
if(s!=null)
s1=s.trim();
//System.out.println(regCheck(s1,re));
if(regCheck(s1,"(//.*)")) //判断//开头的为纯注释行
return 1;
if(regCheck(s1,"(.*[;{})] *//.*)")) //判断不是//开头的非纯注释行
return 2;
if(regCheck(s1,"(//*.*)")){ //判断/*开头的纯注释行
start=true;
return 1;
}
if(regCheck(s1,"(.*[;{})]//*.*)")){ //判断不是/*开头的非纯注释行
start=true;
return 2;
}
if(regCheck(s1,"(.* */*/)")){ //判断*/结尾的纯注释行
start=false;
return 1;
}
if(regCheck(s1,"(.* */*/.*)")&&!strCheck(s1)){ //判断不是*/结尾的非纯注释行
if(strCheck(s1)){
start=false;
return 2;
}
}
if(start==true) //状态代码，start即/*开始时start=true*/结束时为false
return 1;
return 3;//ssssllll
}//aeee
/**
*
* @param s
* @param re
* @return boolean
*/
public boolean regCheck(String s,String re){ //正则表达试判断方法
return Pattern.matches(re,s);
}
public boolean strCheck(String s){ //中间有*/的字符判断 此方法最关键
if(s.indexOf("*/")>0){
int count=0;
String y[]=s.split("/*/");
boolean boo[]=new boolean[y.length];
for (int i = 0; i < y.length-1; i++) {
char c[]=y[i].toCharArray();
for (int j = 0; j < c.length; j++) {
if(c[j]=='\\'&&c[j+1]=='"'){
count++;
}
}
if(count%2==0){
if(countNumber("\"",y[i])%2!=0){
boo[i]=true;
}else{
boo[i]=false;
}
}else{
if(countNumber("\"",y[i])%2==0){
boo[i]=true;
}else{
boo[i]=false;
}
}
}
for(int i=0;i<boo.length;i++){
if(!boo[i])
return false;
}
return true;
}
return false;
}
public int countNumber(String s,String y){ //此方法为我前面写的字符串出现次数统计方法,不懂的可以看我前面的文章
int count=0;
String [] k=y.split(s);
if(y.lastIndexOf(s)==(y.length()-s.length()))
count=k.length;
else
count=k.length-1;
if(count==0)
System.out.println ("字符串\""+s+"\"在字符串\""+y+"\"没有出现过");
else
return count;
return -1;
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class GoodLucky extends JFrame implements ActionListener{
JTextField tf = new JTextField(); //实例化一个文本域
//设置两个按钮
JButton b1 = new JButton("开始");
JButton b2 = new JButton("停止");
boolean isGo = false;
//构造函数
public GoodLucky(){
b1.setActionCommand("start");//在开始按钮上设置一个动作监听 start
JPanel p = new JPanel(); //实例化一个可视化容器
//将两个按钮添加到可视化容器上面，用add方法
p.add(b1);
p.add(b2);
//在两个按钮上增加监听的属性,自动调用下面的监听处理方法actionPerformed(ActionEvent e)，如果要代码有更好的可读性，可用内部类实现动作
//监听处理。
b1.addActionListener(this);
b2.addActionListener(this);
//将停止按钮设置为不可编辑（即不可按的状态）
b2.setEnabled(false);
this.getContentPane().add(tf,"North"); //将上面的文本域放在面板的北方，也就是上面（上北下南左西右东）
this.getContentPane().add(p,"South"); //将可视化容器pannel放在南边，也就是下面
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //设置用户在此窗体上发起 "close" 时默认执行的操作，参数EXIT_ON_CLOSE是使用 System exit 方法退出应用程序。仅在应用程序中使用
this.setSize(300,200); //设置面板大小，宽和高
this.setLocation(300,300); //设置面板刚开始的出现的位置
Cursor cu = new Cursor(Cursor.HAND_CURSOR); //用指定名称创建一个新的定制光标对象，参数表示手状光标类型
this.setCursor(cu); //为指定的光标设置光标图像，即设置光标图像为上面所创建的手状光标类型
this.setVisible(true); //将面板可视化设置为true，即可视，如果为false，即程序运行时面板会隐藏
tf.setText("welcome you! "); //设置面板的标题为欢迎
this.go(); //调用go方法
}
public void go(){
while(true){ //这里是死循环，也就是说用户不点击停止按钮的话他一直循环出现随机数，直到用户点击停止按钮循环才能推出，具体流程在actionPerformed方法中控制。
if(isGo == true){ //上面所定义的isGo的初始值为false，所以程序第一次到此会跳过
String s = ""; //设置空字符串
for(int j = 1; j <= 7;j++){ //产生7个随机数
int i = (int)(Math.random() * 36) + 1;//每个随机数产生方式，这里定义灵活，可以自由定义随机数产生的方式
if(i < 10){
s = s + " 0" + i; //如果产生的随机数小于10的话做处理：这里就牵扯到一个重要的概念，简单叙述一下：
/*
当一个字符串与一个整型数项相加的意思是连接，上面的s = s + " 0" + i的意思是字符串s链接0再连接整型i值，而不会导致0和整型的i相加，
产生的效果为s0i,由于s为空字符串（上面定义过的），所以当i小于零时，在个位数前面加上0，比如产生的随机数i为7的话，显示效果为 07.
*/
}else{
s = s + " " + i; //如果产生的随机数比10打的话，那么加上空格显示，即数字和数字之间有个空格
}
//以上循环循环七次，以保证能出现7个随机数
}
tf.setText(s); //将产生的随机数全部显示在文本域上，用文本域对象tf调用它的设置文本的方法setText(String)实现。
}
//以下为线程延迟
try{
Thread.sleep(10); //线程类同步方法sleep，睡眠方法，括号里的单位为ms。
}catch(java.lang.InterruptedException e){
e.printStackTrace(); //异常捕获，不用多说。
}
}
}
//以下是上面设置的事件监听的具体处理办法，即监听时间处理方法，自动调用
public void actionPerformed(ActionEvent e){ //传入一个动作事件的参数e
String s = e.getActionCommand(); //设置字符串s来存储获得动作监听，上面的start
/*
以下这个条件语句块的作用为：用户点击开始后（捕获start，用方法getActionCommand()），将命令触发设置为true，从而执行上面的go方法中的循环体（因为循环体中要求isGo参数为true,而初始为false）。
执行循环快产生随机数，并将开始按钮不可编辑化，而用户只可以使用停止按钮去停止。如果用户按下停止时，也就是没有传入参数“start”的时候，
执行else语句块中的语句，isGo设置为false，将不执行上面go中的循环语句块，从而停止产生随机数，并显示，并且把开始按钮设置为可用，而把
停止按钮设置为不可用，等待用户按下开始再去开始新一轮循环产生随机数。
*/
if(s.equals("start")){ //如果捕获到start，也就是用户触发了动作*，那么下面处理
isGo = true; //设置isGo为true
b1.setEnabled(false); //将开始按钮设置为不可用
b2.setEnabled(true); //将停止按钮设置为可用
}else{
isGo = false; //将isGo设置为false，isGo为循环标志位
b2.setEnabled(false); //设置停止按钮为不可用（注意看是b2,b2是停止按钮）
b1.setEnabled(true); //设置开始按钮为可用
}
}
public static void main(String[] args){
new GoodLucky(); //产生类的实例，执行方法
}
}
热心网友
时间：2024-02-08 22:54
/*
This class defines a class that contains some useful
attributions and some methods to set or get these attributions
*/
import javax.swing.JButton;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.util.Random;
import java.util.Timer;
class ExButton extends JButton
{
//if the button is a mine,the isMine will be true
private boolean isMine;
//to check if a button has been visited is useful
//when using the recursion in the Game class
private boolean isVisited;
//the row number of the button
int btnRowNumber;
//the column number of the button
int btnColumnNumber;
//the mines around a button
int minesAround=0;
public void setIndex(int btnRowNumber,int btnColumnNumber)
{
this.btnRowNumber=btnRowNumber;
this.btnColumnNumber=btnColumnNumber;
}
public int getRowNumber()
{
return this.btnRowNumber;
}
public int getColumnNumber()
{
return this.btnColumnNumber;
}
public void setVisited(boolean isVisited)
{
this.isVisited=isVisited;
}
public boolean getVisited()
{
return this.isVisited;
}
public void setMine(boolean isMine)
{
this.isMine=isMine;
}
public boolean getMine()
{
return this.isMine;
}
//the attribute of minesAround add one each
//time a mine is put down around the button
public void addMinesAround()
{
this.minesAround++;
}
public int getMinesAround()
{
return this.minesAround;
}
}
//-------------------------------------------------
/*
File Name: Game.java
Author: Tian Wei Student Number: Email: xiangchensuiyue@163.com
Assignment number: #4
Description: In this program ,a frame will be created which contains
ten "mines".When you click a button ,it will present the
number of mines around or a message of losing the game
(if the button is a mine).You can make a right click to
sign a dengerous button as well.When all the mines have
been signed ,a message box of winning the game will jump
to the screen.And the the message of the time you used in
the game.More over,you can click the button on the bottom
to restart the game.
*/
public class Game extends JFrame{
//define some menber variables
private long minute=0,second=0;//take down time used int the game
private ExButton[][] btn;//two-dimension array present the buttons
private JLabel label;
private JButton restart;//restart button
private int minesRemained;//remained mines that you have not signed
private boolean thisTry=true;
private JLabel timeUsed=new JLabel ();
private Random rand=new Random();
private final int ROWS,COLUMNS;
private final int MINES;
// the constuctor
public Game(int rows,int columns,int mines)
{
super("Find mines");
this.ROWS=rows;
this.COLUMNS=columns;
this.MINES=mines;
minesRemained=MINES;
Timer timer=new Timer();//Timer's object to timer the game
timer.schele(new MyTimer(), 0, 1000);//do the function every second
Container container=getContentPane();
container.setLayout(new BorderLayout());
//Jpanel in the Container
JPanel jpanel=new JPanel();
jpanel.setLayout(new GridLayout(ROWS,COLUMNS));
restart=new JButton("click me to restart the game");
JPanel jpanel2=new JPanel();
//Another JPanel in the Container
jpanel2.setLayout(new FlowLayout());
jpanel2.add(timeUsed);
jpanel2.add(restart);
ButtonListener restartHandler=new ButtonListener();
restart.addActionListener(restartHandler);
container.add(jpanel2,BorderLayout.SOUTH);
btn=new ExButton[ROWS+2][COLUMNS+2];
//initialize the buttons
for(int i=0;i<=ROWS+1;i++)
{
for(int j=0;j<=COLUMNS+1;j++)
{
btn[i][j]=new ExButton();
btn[i][j].addMouseListener(new MouseClickHandler());
btn[i][j].setIndex(i,j);
btn[i][j].setVisited(false);
}
}
for(int i=1;i<=ROWS;i++)
for(int j=1;j<=COLUMNS;j++)
jpanel.add(btn[i][j]);
container.add(jpanel,BorderLayout.CENTER);
JPanel jpanel3=new JPanel ();
label=new JLabel();
label.setText("Mines remaining "+MINES);
jpanel3.add(label);
container.add(jpanel3,BorderLayout.NORTH );
this.addMines();
this.addMinesAround();
}
//randomly put ten mines
private void addMines()
{
for(int i=1;i<=MINES;i++)
{
int raInt1=rand.nextInt(ROWS);
int raInt2=rand.nextInt(COLUMNS);
if((raInt1==0)||(raInt2==0)||btn[raInt1][raInt2].getMine())
i--;
else
btn[raInt1][raInt2].setMine(true);
}
}
//take down the mines around a button
private void addMinesAround()
{
for(int i=1;i<=ROWS;i++)
{
for(int j=1;j<=COLUMNS;j++)
{
if(btn[i][j].getMine())
{
btn[i][j-1].addMinesAround();
btn[i][j+1].addMinesAround();
btn[i-1][j-1].addMinesAround();
btn[i-1][j].addMinesAround();
btn[i-1][j+1].addMinesAround();
btn[i+1][j-1].addMinesAround();
btn[i+1][j].addMinesAround();
btn[i+1][j+1].addMinesAround();
}
}
}
}
//if a button clicked is a empty one,then use a recursion
//to find all the empty buttons around
private void checkEmpty(ExButton button)
{
button.setVisited(true);
int x=button.getRowNumber();
int y=button.getColumnNumber();
button.setBackground(Color.white);
if((button.getMinesAround()==0)&&(x>=1)&&(x<=ROWS)
&&(y>=1)&&(y<=COLUMNS))
{
if(!btn[x][y-1].getVisited())
checkEmpty(btn[x][y-1]);
if(!btn[x][y+1].getVisited())
checkEmpty(btn[x][y+1]);
if(!btn[x-1][y].getVisited())
checkEmpty(btn[x-1][y]);
if(!btn[x+1][y].getVisited())
checkEmpty(btn[x+1][y]);
if(!btn[x-1][y-1].getVisited())
checkEmpty(btn[x-1][y-1]);
if(!btn[x-1][y+1].getVisited())
checkEmpty(btn[x-1][y+1]);
if(!btn[x+1][y-1].getVisited())
checkEmpty(btn[x+1][y-1]);
if(!btn[x+1][y+1].getVisited())
checkEmpty(btn[x+1][y+1]);
}
else if(button.getMinesAround()>0)
button.setText(""+button.getMinesAround());
}
//the main function
public static void main(String args[])
{
String rows,columns,mines;
int rowNumber,columnNumber,mineNumber;
rows=JOptionPane.showInputDialog("Enter the rows of the game");
columns=JOptionPane.showInputDialog("Enter the columns of the game");
mines=JOptionPane.showInputDialog("Enter the mines of the game");
rowNumber=Integer.parseInt(rows);
columnNumber=Integer.parseInt(columns);
mineNumber=Integer.parseInt(mines);
Game frame=new Game(rowNumber,columnNumber,mineNumber);
frame.setTitle("Find Mines");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(220, 80);
frame.setSize(600, 600 );
frame.setVisible(true);
}
//there are three inner class below
//The first inner class is used to do the mouse listener's
//function.When you click a button ,it will present the
//number of mines around or a message of losing the game
//(if the button is a mine).You can make a right click to
//sign a dengerous button as well.When ten mines have been
//signed,it will check whether all the signed ones are mines
private class MouseClickHandler extends MouseAdapter
{
public void mouseClicked(MouseEvent event)
{
//get the button that been clicked
ExButton eventButton=new ExButton();
eventButton=(ExButton)event.getSource();
eventButton.setVisited(true);
//when it is a right click
if(event.isMetaDown())
{
if(eventButton.getText()=="#")
{
minesRemained++;
eventButton.setText("");
}
else
{
if((eventButton.getBackground()==Color.white)||
(eventButton.getText()!=""))
{
//do nothing
}
else
{
minesRemained--;
eventButton.setText("#");
}
}
label.setText("Mines remaining "+minesRemained);
//check if all the signed buttons are mines
if(minesRemained==0)
{
for(int i=1;i<=ROWS;i++)
for(int j=1;j<=COLUMNS;j++)
{
if(btn[i][j].getMine()&&btn[i][j].getText()!="#")
thisTry=false;
if(!btn[i][j].getMine()&&btn[i][j].getText()=="#")
thisTry=false;
}
if(thisTry)
{
//win the game
JOptionPane.showMessageDialog(null, "You succeed" +
" in this experience!");
JOptionPane.showMessageDialog(null, "Time used:"+
timeUsed.getText());
}
else//you have wrongly signed one or more mines
JOptionPane.showMessageDialog(null, "You have wrongly " +
"signed one or more mines,please check it and go on!");
}
}
else if(event.isAltDown())
{
//do nothing
}
else
{//normally click(left click)
if(eventButton.getText()=="#")
{
//do nothing
}
else if(eventButton.getMine())
{
//lose the game
JOptionPane.showMessageDialog(null, "What a pity!" +
"You failed!" );
//show all the mines to the loser
for(int i=1;i<=ROWS;i++)
for(int j=1;j<=COLUMNS;j++)
{
if(btn[i][j].getMine())
btn[i][j].setBackground(Color.BLACK);
}
JOptionPane.showMessageDialog(null, "Time used: 0"+
minute+":"+second);
}
else
{
if(eventButton.getMinesAround()==0)
{
//call the function to find all the empty buttons around
checkEmpty(eventButton);
}
else
eventButton.setText(""+eventButton.getMinesAround());
}
}
}
}
//The second class is to listen to the button which used to
//restart the game.In this class,it will dispose the old frame
//and create a new one(Of course,the mines's position have
//been changed).
private class ButtonListener implements ActionListener
{
public void actionPerformed (ActionEvent e)
{
//what to dispose is the object of Game class
Game.this.dispose();
//the same code as in the main function
Game frame=new Game(ROWS,COLUMNS,MINES);
frame.setTitle("Find Mines");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 600 );
//make sure the frame is at the center of the screen
frame.setLocation(220, 80);
frame.setVisible(true);
}
}
//The last class is the class that will be used in the
//Timer's object timer.It should inherit the class TimerTask
//It is the task that the Timer will do every second
private class MyTimer extends TimerTask
{
public void run()
{
second+=1;
minute+=second/60;
second=second%60;
//change the text of the time used in the game
timeUsed.setText("Time used 0"+minute+":"+second);
}
}
}
//end of the class Game
热心网友
时间：2024-02-08 22:55
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JTextField txtResult;
private JButton btnZero, btnOne, btnTwo, btnThree, btnFour, btnFive,
btnSix, btnSeven, btnEight, btnNine, btnPlus, btnMinus, btnTimes,
btnDivided, btnEqual, btnPoint, btnC, btnCE, btnSqrt, btnPlusMinus;
int z;
double x, y;
StringBuffer str;
public Calculator() {
super("计算器");
this.setSize(311, 231);
this.setLocation(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(new GridLayout(1, 1));// 网格布局
JPanel panel = new JPanel(new GridLayout(6, 1));// 面板 网格布局6行1列
this.add(panel);
txtResult = new JTextField("0");
Color BackColor = new Color(255, 255, 255);
Color ForeColor = new Color(0, 0, 0);
txtResult.setBackground(BackColor);
txtResult.setForeground(ForeColor);
panel.add(txtResult);
txtResult.setHorizontalAlignment(JTextField.RIGHT);
txtResult.setEnabled(false);
// text.setEnabled(true);
JPanel panel_1 = new JPanel(new GridLayout(1, 4));
panel.add(panel_1);
btnSqrt = new JButton("sqrt");
panel_1.add(btnSqrt);
btnSqrt.addActionListener(this);
btnPlusMinus = new JButton("+/-");
panel_1.add(btnPlusMinus);
btnPlusMinus.addActionListener(this);
btnCE = new JButton("CE");
panel_1.add(btnCE);
btnCE.addActionListener(this);
btnC = new JButton("C");
panel_1.add(btnC);
btnC.addActionListener(this);
JPanel panel_2 = new JPanel(new GridLayout(1, 4));
panel.add(panel_2);
btnSeven = new JButton("7");
panel_2.add(btnSeven);
btnSeven.addActionListener(this);
btnEight = new JButton("8");
panel_2.add(btnEight);
btnEight.addActionListener(this);
btnNine = new JButton("9");
panel_2.add(btnNine);
btnNine.addActionListener(this);
btnDivided = new JButton("/");
panel_2.add(btnDivided);
btnDivided.addActionListener(this);
JPanel panel_3 = new JPanel(new GridLayout(1, 4));
panel.add(panel_3);
btnFour = new JButton("4");
panel_3.add(btnFour);
btnFour.addActionListener(this);
btnFive = new JButton("5");
panel_3.add(btnFive);
btnFive.addActionListener(this);
btnSix = new JButton("6");
panel_3.add(btnSix);
btnSix.addActionListener(this);
btnTimes = new JButton("*");
panel_3.add(btnTimes);
btnTimes.addActionListener(this);
JPanel panel_4 = new JPanel(new GridLayout(1, 4));
panel.add(panel_4);
btnOne = new JButton("1");
panel_4.add(btnOne);
btnOne.addActionListener(this);
btnTwo = new JButton("2");
panel_4.add(btnTwo);
btnTwo.addActionListener(this);
btnThree = new JButton("3");
panel_4.add(btnThree);
btnThree.addActionListener(this);
btnMinus = new JButton("-");
panel_4.add(btnMinus);
btnMinus.addActionListener(this);
JPanel panel_5 = new JPanel(new GridLayout(1, 4));
panel.add(panel_5);
btnZero = new JButton("0");
panel_5.add(btnZero);
btnZero.addActionListener(this);
btnPoint = new JButton(".");
panel_5.add(btnPoint);
btnPoint.addActionListener(this);
btnEqual = new JButton("=");
panel_5.add(btnEqual);
btnEqual.addActionListener(this);
btnPlus = new JButton("+");
panel_5.add(btnPlus);
btnPlus.addActionListener(this);
str = new StringBuffer();
this.setVisible(true);
}
public void windowClosing(WindowEvent a) {
System.exit(0);
}
public void actionPerformed(ActionEvent e) {
try {
if (e.getSource() == btnC) {
txtResult.setText("0");
str.setLength(0);
} else if (e.getSource() == btnCE) {
txtResult.setText("0.");
str.setLength(0);
} else if (e.getSource() == btnPlusMinus) {
x = Double.parseDouble(txtResult.getText().trim());
txtResult.setText("" + (-x));
} else if (e.getSource() == btnPlus) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 1;
} else if (e.getSource() == btnMinus) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 2;
} else if (e.getSource() == btnTimes) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 3;
} else if (e.getSource() == btnDivided) {
x = Double.parseDouble(txtResult.getText().trim());
str.setLength(0);
y = 0d;
z = 4;
} else if (e.getSource() == btnEqual) {
str.setLength(0);
switch (z) {
case 1:
txtResult.setText("" + (x + y));
break;
case 2:
txtResult.setText("" + (x - y));
break;
case 3:
txtResult.setText("" + (x * y));
break;
case 4:
txtResult.setText("" + (x / y));
break;
}
}
else if (e.getSource() == btnPoint) {
if (txtResult.getText().trim().indexOf('.') != -1)// 判断字符串中是否已经包含了小数点
{
} else// 如果没数点有小
{
if (txtResult.getText().trim().equals("0"))// 如果初时显示为0
{
str.setLength(0);
txtResult.setText((str.append("0"
+ e.getActionCommand())).toString());
} else if (txtResult.getText().trim().equals(""))// 如果初时显示为空则不做任何操作
{
} else {
txtResult.setText(str.append(e.getActionCommand())
.toString());
}
}
y = 0d;
}
else if (e.getSource() == btnSqrt)// 求平方根
{
x = Double.parseDouble(txtResult.getText().trim());
txtResult.setText("数字格式异常");
if (x < 0)
txtResult.setText("负数没有平方根");
else
txtResult.setText("" + Math.sqrt(x));
str.setLength(0);
y = 0d;
}
else if (e.getSource() == btnZero)// 如果选择的是"0"这个数字键
{
if (txtResult.getText().trim().equals("0"))// 如果显示屏显示的为零不做操作
{
} else {
txtResult.setText(str.append(e.getActionCommand())
.toString());
y = Double.parseDouble(txtResult.getText().trim());
}
}
else// 其他的数字键
{
txtResult.setText(str.append(e.getActionCommand()).toString());
y = Double.parseDouble(txtResult.getText().trim());
}
} catch (NumberFormatException ae) {
txtResult.setText("数字格式异常");
} catch (StringIndexOutOfBoundsException ae) {
txtResult.setText("字符串索引越界");
}
}
public static void main(String arg[]) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
new Calculator();
}
}
热心网友
时间：2024-02-08 22:55
用Java写的记事本，同样的，仅供交流，请勿商用！
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class Remember extends JFrame implements TreeSelectionListener,ActionListener
{
JTree tree=null;
JTextArea text=new JTextArea(20,20);
int i=0;
DefaultMutableTreeNode root;
JButton b_save=new JButton("保存日记");
JButton b_del=new JButton("删除日记");
DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];
Remember()
{
Container con=getContentPane();
DefaultMutableTreeNode root=new DefaultMutableTreeNode("日历记事本");
for(i=1;i<=12;i++)
{
month=new DefaultMutableTreeNode(""+i+"月");
root.add(month);
}
for(i=1;i<=12;i++)
{
if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
{
for(int j=1;j<=31;j++)
month.add(new DefaultMutableTreeNode(j+"日"));
}
else if(i==4||i==6||i==9||i==11)
{
for(int j=1;j<=30;j++)
month.add(new DefaultMutableTreeNode(j+"日"));
}
else
{
for (int j=1;j<=28;j++)
month.add(new DefaultMutableTreeNode(j+"日"));
}
}
b_save.addActionListener(this);
b_del.addActionListener(this);
tree=new JTree(root);
JPanel p=new JPanel();
p.setLayout(new BorderLayout());
JScrollPane scrollpane_1=new JScrollPane(text);
p.add(scrollpane_1,BorderLayout.CENTER);
JPanel p_1=new JPanel();
p_1.add(b_save);
p_1.add(b_del);
p.add(p_1,BorderLayout.NORTH);
JScrollPane scrollpane_2=new JScrollPane(tree);
JSplitPane splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scrollpane_2,p);
tree.addTreeSelectionListener(this);
con.add(splitpane);
setVisible(true);
setBounds(70,80,460,320);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
public void valueChanged(TreeSelectionEvent e)
{
text.setText(null);
if(e.getSource()==tree)
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if(node.isLeaf())
{
String str=node.toString();
for(int i=0;i<=12;i++)
{
if(node.getParent()==month)
{
try{
String temp=null;
File f=new File(node.getParent().toString()+str+".txt");
FileReader file=new FileReader(f);
BufferedReader in=new BufferedReader(file);
while((temp=in.readLine())!=null)
text.append(temp+'\n');
file.close();
in.close();
}
catch(Exception el){}
}
}
}
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b_save)
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{
try
{
File f=new File(node.getParent().toString()+str+".txt");
FileWriter tofile=new FileWriter(f);
BufferedWriter out=new BufferedWriter(tofile);
out.write(text.getText(),0,(text.getText()).length());
out.flush();
tofile.close();
out.close();
}
catch(Exception el){}
}
}
else if(e.getSource()==b_del)
{
DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
String str=node.toString();
if(node.isLeaf())
{
File f=new File(node.getParent().toString()+str+".txt");
f.delete();
}
}
}
}
public class Example17_13 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Remember win=new Remember();
win.validate();
}
}
热心网友
时间：2024-02-08 22:56
