java簡單計(jì)算器源代碼

1、 簡單計(jì)算器代碼package calcultorthree;import java.awt.BorderLayout;/導(dǎo)入邊界布局管理器類import java.awt.GridLayout;/導(dǎo)入網(wǎng)格布局管理器類import java.awt.TextField;/導(dǎo)入文本區(qū)域類import java.awt.event.ActionEvent;/導(dǎo)入事件類import java.awt.event.ActionListener;/導(dǎo)入事件監(jiān)聽者類import javax.swing.JButton;/導(dǎo)入按鈕類import javax.swing.JFrame;/導(dǎo)入窗體import

2、javax.swing.JPanel;/導(dǎo)入面板/* *本例實(shí)現(xiàn)了簡單計(jì)算器代碼，具備加減乘除和正弦功能，旨在抱磚引玉。熟悉java的同學(xué)，可以在此基礎(chǔ)上實(shí)現(xiàn)更復(fù)雜的功能。 * author Fjsh */public class CalcultorThree /新建對(duì)象，在構(gòu)造函數(shù)中進(jìn)行初始化 JFrame frame;/新建窗體對(duì)象 JButton buttonzero,buttondot,buttonequal;/新建按鈕“0”“.”“=” JButton buttonplus,buttonminus,buttonmultiple,buttondevision, buttonsin,bu

3、ttontozero;/新建按鈕“+”“-”“*”“/”“sin”和歸零按鈕 JButton buttonone,buttontwo,buttonthree,buttonfour,buttonfive,buttonsix, buttonseven,buttoneight,buttonnine;/新建數(shù)字按鈕“0”“1”“2”“3”“4”“5”“6”“7”“8”“9” JPanel panelwest,panelcenter,paneleast;/新建三個(gè)面板 TextField tf;/新建文本區(qū)域?qū)ο?public CalcultorThree() /初始化對(duì)象 tf=new TextFie

4、ld(30);/構(gòu)造空文本字段，字符寬度為30 frame =new JFrame(CalculatorThree);/構(gòu)造窗體對(duì)象，名稱為“CalculatorThree” panelcenter=new JPanel();/構(gòu)造面板，放到窗體中央 panelwest=new JPanel();/構(gòu)造面板，放到窗體西邊 paneleast=new JPanel();/構(gòu)造面板，放到窗體東邊 Handle h=new Handle();/新建Handle類對(duì)象，Handle類為事件監(jiān)聽類 /創(chuàng)建數(shù)字按鈕對(duì)象，1、2、3、4、5、6、7、8、9 buttonone=new JButton(1);

5、 buttontwo=new JButton(2); buttonthree=new JButton(3); buttonfour=new JButton(4); buttonfive=new JButton(5); buttonsix=new JButton(6); buttonseven=new JButton(7); buttoneight=new JButton(8); buttonnine=new JButton(9); panelcenter.setLayout(new GridLayout(3,3);/設(shè)置面板布局為網(wǎng)格布局，3行3列 /將數(shù)字按鈕添加到中間面板 panelcen

6、ter.add(buttonone); panelcenter.add(buttontwo); panelcenter.add(buttonthree); panelcenter.add(buttonfour); panelcenter.add(buttonfive); panelcenter.add(buttonsix); panelcenter.add(buttonseven); panelcenter.add(buttoneight); panelcenter.add(buttonnine); /為10個(gè)按鈕注冊(cè)事件監(jiān)聽器 buttonone.addActionListener(h);

7、buttontwo.addActionListener(h); buttonthree.addActionListener(h); buttonfour.addActionListener(h); buttonfive.addActionListener(h); buttonsix.addActionListener(h); buttonseven.addActionListener(h); buttoneight.addActionListener(h); buttonnine.addActionListener(h); /構(gòu)造按鈕“0”“.”“=”，注冊(cè)事件監(jiān)聽器，設(shè)置1行3列的布局，添加

8、到到西邊的面板 buttonzero=new JButton(0); buttondot=new JButton(.); buttonequal=new JButton(=); buttonzero.addActionListener(h); buttondot.addActionListener(h); buttonequal.addActionListener(h); panelwest.setLayout(new GridLayout(3,1); panelwest.add(buttonzero); panelwest.add(buttondot); panelwest.add(butt

9、onequal); /構(gòu)造操作按鈕“+”“-”“*”“/”“sin”“0”，其中“0”為歸零按鈕 buttonplus=new JButton(+); buttonminus=new JButton(-); buttonmultiple=new JButton(*); buttondevision=new JButton(/); buttonsin=new JButton(sin); buttontozero=new JButton(0); paneleast.setLayout(new GridLayout(3,1);/設(shè)置西邊的布局為3行1列 /將操作按鈕“+”“-”“*”“/”“sin”

10、“0”添加到西邊的面板中 paneleast.add(buttonplus); paneleast.add(buttonminus); paneleast.add(buttonmultiple); paneleast.add(buttondevision); paneleast.add(buttonsin); paneleast.add(buttontozero); /為操作按鈕“+”“-”“*”“/”“sin”“0”注冊(cè)監(jiān)聽器 buttonplus.addActionListener(h); buttonminus.addActionListener(h); buttonmultiple.a

11、ddActionListener(h); buttondevision.addActionListener(h); buttonsin.addActionListener(h); buttontozero.addActionListener(h); frame.setLayout(new BorderLayout();/設(shè)置窗體為邊界布局 frame.add(paneleast,East);/將東邊面板paneleast添加到窗體的東邊 frame.add(tf,BorderLayout.NORTH); /將tf文本區(qū)域添加到窗體的北邊，即頂部 frame.add(panelwest,Bord

12、erLayout.WEST);/將panelwest面板添加到窗體西邊 frame.add(panelcenter,BorderLayout.CENTER);/將panelcenter面板添加到窗體中間 frame.pack();/設(shè)置窗體大小，適合其子組件的首選大小和布局 frame.setLocation(500,500);/設(shè)置窗體顯示位置為（500,500） frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);/設(shè)置布局窗體默認(rèn)關(guān)閉方式 frame.setVisible(true);/設(shè)置窗體可見 public static voi

13、d main(String args) new CalcultorThree();/主方法中新建對(duì)象 class Handle implements ActionListener/實(shí)現(xiàn)動(dòng)作監(jiān)聽器類 int biaozhi=0;/此標(biāo)志標(biāo)志加減乘除操作 double flag1=0,flag2=0,flag3=0;/flag1、flag2為兩個(gè)操作數(shù)，flag3為結(jié)果 Override public void actionPerformed(ActionEvent e) /方法重寫 try/此處可能會(huì)產(chǎn)生異常，用try、catch捕捉異常，不用處理 if(e.getSource()=button

14、dot)/小數(shù)點(diǎn) tf.setText(0.); if(e.getSource()=buttontozero)/歸零操作 tf.setText(); if(e.getSource()=buttonzero)/按鍵0操作 tf.setText(tf.getText()+0); flag1=Double.parseDouble(tf.getText();/將文本區(qū)域轉(zhuǎn)換成Double類型，賦給flag1 if(e.getSource()=buttonone)/按鍵1操作 tf.setText(tf.getText()+1); flag1=Double.parseDouble(tf.getText(

15、); else if(e.getSource()=buttontwo)/按鍵2操作 tf.setText(tf.getText()+2); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttonthree)/按鍵3操作 tf.setText(tf.getText()+3); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttonfour)/按鍵4操作 tf.setText(tf.getText()+4); flag1=Double.pa

16、rseDouble(tf.getText(); else if(e.getSource()=buttonfive)/按鍵5操作 tf.setText(tf.getText()+5); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttonsix)/按鍵6操作 tf.setText(tf.getText()+6); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttonseven)/按鍵7操作 tf.setText(tf.getText(

17、)+7); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttoneight)/按鍵8操作 tf.setText(tf.getText()+8); flag1=Double.parseDouble(tf.getText(); else if(e.getSource()=buttonnine)/按鍵9操作 tf.setText(tf.getText()+9); flag1=Double.parseDouble(tf.getText(); if(e.getSource()=buttonplus)/加法操作 tf.set

18、Text(); flag2=flag1; biaozhi=0; if(e.getSource()=buttonminus)/減法操作 tf.setText(); flag2=flag1; biaozhi=1; if(e.getSource()=buttonmultiple)/乘法操作 tf.setText(); flag2=flag1; biaozhi=2; if(e.getSource()=buttondevision)/除法操作 tf.setText(); flag2=flag1; biaozhi=3; if(e.getSource()=buttonsin)/正弦操作 flag3=Math.sin(flag1); tf.set