java倒數(shù)數(shù)字代碼 java中倒數(shù)

用java編寫一個倒計時器代碼。

import java.awt.BorderLayout;import java.awt.Container;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class TimerDemo extends JFrame implements ActionListener { private static final long serialVersionUID = 201306211111L; private JTextField screen = new JTextField("0"); private JButton start = new JButton("開始"); private JButton reset = new JButton("重置"); private JPanel panel = new JPanel(); private boolean isRunning; private int time; private int timeBetween; public TimerDemo(int timeBetween) { super("計時器"); this.timeBetween = timeBetween; try { init(); } catch (Exception e) { e.printStackTrace(); } } public TimerDemo() { super("計時器"); this.timeBetween = 100; try { init(); } catch (Exception e) { e.printStackTrace(); } } private void init() { panel.setLayout(new GridLayout()); panel.add(start); panel.add(reset); start.addActionListener(this); reset.addActionListener(this); screen.setFont(new Font("幼圓", Font.BOLD, 60)); screen.setHorizontalAlignment(JTextField.CENTER); screen.setEditable(false); Container c = getContentPane(); c.setLayout(new BorderLayout()); c.add(panel, BorderLayout.SOUTH); c.add(screen, BorderLayout.CENTER); this.setSize(200, 150); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setLocationRelativeTo(null); this.setVisible(true); } public static void main(String[] args) { new TimerDemo(1);// 設(shè)定 1ms/次 // new TimerDemo(); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == start) { if (start.getText().equals("開始")) { start.setText("暫停"); isRunning = true; } else if (start.getText().equals("暫停")) { start.setText("開始"); isRunning = false; } } if (e.getSource() == reset) { start.setText("開始"); screen.setText("0"); isRunning = false; time = 0; } new Thread(new TimeZone()).start(); } class TimeZone implements Runnable { @Override public void run() { while (isRunning) { time++; if (time = Integer.MAX_VALUE) { screen.setText("ERROR"); JOptionPane.showMessageDialog(null, "ERROR"); isRunning = false; } screen.setText(String.valueOf(time)); try { Thread.sleep(timeBetween); } catch (Exception e) { e.printStackTrace(); } } } }}

創(chuàng)新互聯(lián)是一家集網(wǎng)站建設(shè),習(xí)水企業(yè)網(wǎng)站建設(shè),習(xí)水品牌網(wǎng)站建設(shè),網(wǎng)站定制,習(xí)水網(wǎng)站建設(shè)報價,網(wǎng)絡(luò)營銷,網(wǎng)絡(luò)優(yōu)化,習(xí)水網(wǎng)站推廣為一體的創(chuàng)新建站企業(yè)，幫助傳統(tǒng)企業(yè)提升企業(yè)形象加強企業(yè)競爭力?？沙浞譂M足這一群體相比中小企業(yè)更為豐富、高端、多元的互聯(lián)網(wǎng)需求。同時我們時刻保持專業(yè)、時尚、前沿，時刻以成就客戶成長自我，堅持不斷學(xué)習(xí)、思考、沉淀、凈化自己，讓我們?yōu)楦嗟钠髽I(yè)打造出實用型網(wǎng)站。

java編寫計算器實現(xiàn)退格，倒數(shù)，小數(shù)點，正負號功能代碼

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class General extends JFrame implements ActionListener

{

String args[]={"退格","總清","清零","/","1","2","3","+","4","5","6","-","7","8","9","*","0","+/-",".","="};

JButton jb[]=new JButton[20];

JPanel p1=new JPanel();

JTextField jtf=new JTextField(15);

double num1,num2,jieguo;

char c,ch;

public General()

{

Container ct=getContentPane();

jtf.addKeyListener(new KA());

jtf.setHorizontalAlignment(JTextField.RIGHT);

ct.add(jtf,"North");

p1.setLayout(new GridLayout(5,4));

for(int i=0;i20;i++)

{

jb[i]=new JButton(args[i]);

jb[i].addActionListener(this);

p1.add(jb[i]);

}

ct.add(p1);

pack();

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String args[])

{

new General();

}

public void actionPerformed(ActionEvent e)// 監(jiān)聽按鍵

{

String str=e.getActionCommand().trim();

if("0123456789.".indexOf(str)!=-1)

{

if(jtf.getText().equals("0"))jtf.setText(null);

jtf.setText(jtf.getText()+str);

return;

}

if("+-*/".indexOf(str)!=-1)

{

num1=Double.parseDouble(jtf.getText());

c=str.charAt(0);

jtf.setText(null);

return;

}

else if(str.equals("="))

{

num2=Double.parseDouble(jtf.getText());

switch(c)

{

case '+': jieguo=num1+num2; break;

case '-': jieguo=num1-num2; break;

case '*': jieguo=num1*num2; break;

case '/': jieguo=num1/num2; break;

}

jtf.setText(Double.toString(jieguo));

}

else if(str.equals("+/-"))

{

if(jtf.getText().isEmpty()==false)

{

Double lnum=-(Double.parseDouble(jtf.getText()));

jtf.setText(Double.toString(lnum));

}

else

{

jtf.setText("-");

}

}

else if(str.equals("清空"))

{

jtf.setText(null);

}

else if(str.equals("清零"))

{

jtf.setText("0");

}

else if(str.equals("退格"))

{

jtf.setText(jtf.getText().substring(0,jtf.getText().length()-1));

}

}

class KA extends KeyAdapter // 監(jiān)聽鍵盤

{

public void keyPressed(KeyEvent e)

{

char ch=e.getKeyChar();

if("+-*/".indexOf(ch)!=-1)

{

num1=Double.parseDouble(jtf.getText());

c=ch;

}

if(ch=='='|ch==e.VK_ENTER)

{

num2=Double.parseDouble(jtf.getText());

switch(c)

{

case '+': jieguo=num1+num2; break;

case '-': jieguo=num1-num2; break;

case '*': jieguo=num1*num2; break;

case '/': jieguo=num1/num2; break;

}

}

}

public void keyReleased(KeyEvent e)

{

char ch=e.getKeyChar();

if("+-*/".indexOf(ch)!=-1)

{

jtf.setText(null);

}

if(ch=='='|e.getKeyCode()==e.VK_ENTER)

{

jtf.setText(Double.toString(jieguo));

}

}

}

}

java中,1~10倒著數(shù)出來,用for語句

代碼如下：

public class Test

{

public static void main(String[] args)

{

for(int i =10; i=1 ; i--)

{

System.out.print(i);

System.out.print(" ");

}

}

}

以上代碼可靈活的變動for里的i初始值。

java編程求某個數(shù)的相反數(shù),倒數(shù),絕對值

//倒數(shù)

double y=(double)1/123;//1除以任何數(shù) 就是他本身的倒數(shù) 這里把1/123強轉(zhuǎn)為double類型

System.out.println("y的倒數(shù)為"+y);

int x =123;//x可以為任意數(shù)0-x就是x的相反數(shù)

System.out.println((0-x));

//絕對值

int a =-15;

int b=Math.abs(a);

System.out.println(b);

分享標題：java倒數(shù)數(shù)字代碼 java中倒數(shù)
轉(zhuǎn)載注明：http://bm7419.com/article36/dohpdpg.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供定制網(wǎng)站、網(wǎng)站設(shè)計公司、小程序開發(fā)、App開發(fā)、關(guān)鍵詞優(yōu)化、微信小程序

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)