java简单计算器源代码

1、简单计算器代码package calcultorthree;import java.awt.BorderLayout;/导入边界布局管理器类 import java.awt.GridLayout;/导入网格布局管理器类 import java.awt.TextField;/ 导入文本区域类import java.awt.event.ActionEvent; 导入事件类import java.awt.event.ActionListener; 导入事件监听者类import javax.swing.JButton;/ 导入按钮类import javax.swing.JFrame;/ 导入窗体imp

2、ort javax.swing.JPanel; 导入面板/*本例实现了简单计算器代码，具备加减乘除和正弦功能，旨在抱砖引玉。熟悉java的同学，可以在此基础上实现更复杂的功能。* author Fjsh*/ public class CalcultorThree /新建对象，在构造函数中进行初始化JFrame frame;/新建窗体对象JButton buttonzero,buttondot,buttonequal;/ 新建按钮 “ 0”". ”"=”JButt on butt on plus,butt onminu s,butt onm ultiple,butt on d

3、evisi on,buttonsin,buttontozero;/ 新建按钮 “ +"-” “ “ * ”" /和归零按钮JButt on butt onon e,butt on two,butt on three,butt on four,butt on five,butt on six,butt on seve n,butt on eight,butt onnine;/新 建 数 字“0”“1 ”“ 2”“ 3”“ 4”“ 5”“ 6”“ 7”“ 8”“ 9”JPa nel pan elwest,pa nelce nter,pa neleast;/新 建三个面板Text

4、Field tf;/新建文本区域对象public CalcultorThree()初始化对象tf=new TextField(30);构造空文本字段，字符宽度为30frame =new JFrame("CalculatorThree"); 构造窗体对象，名称为“ CalculatorThreepan elce nter= new JPa nel();构造面板，放到窗体中央pan elwest=new JPa nel();构造面板，放到窗体西边pan eleast =new JPa nel();构造面板，放到窗体东边Handle h=new Handle();新建Handle

5、类对象，Handle类为事件监听类/创建数字按钮对象，1、2、3、4、5、6、7、8、9butto non e=new JButto n( "1");butto ntwo=new JButto n( "2");butt on three=new JButto n( "3");butto nfour= new JButto n( "4");butt on five=new JButto n( "5");butto nsix= new JButto n( "6");butt on

6、 seve n=new JButt on ("7");butto neight=new JButto n( "8");butt onnin e=new JButt on ("9");panelcenter.setLayout(new GridLayout(3,3); 设置面板布局为网格布局，3 行 3 列将数字按钮添加到中间面板pan elce nter.add(butt onon e);pan elce nter.add(butt on two);pan elce nter.add(butt on three);pan elce n

7、ter.add(butt on four);pan elce nter.add(butt on five);pan elce nter.add(butt on six);pan elce nter.add(butt on seve n);pan elce nter.add(butt on eight);pan elce nter.add(butt onnin e);为10个按钮注册事件监听器butt onon e.addAct ion Liste ner(h);butt on two.addAct ion Liste ner(h);butt on three.addAct ion Liste

8、ner(h);butt on four.addAct ion Liste ner(h);butt on five.addAct ion Liste ner(h);butt on six.addAct ion Liste ner(h);butt on seve n. addAct ion Liste ner(h);butt on eight.addAct ion Liste ner(h);butt onnin e.addAct ion Liste ner(h);构造按钮“ 0”“ .,”注册事件监听器，设置1行3列的布局，添加到到西边的面 butto nzero=n ew JButt on (&

9、quot;0"); butto ndot=new JButto n(".");butt on equal=new JButt on ("=");butt on zero.addAct ion Liste ner(h);butt on dot.addActi on Liste ner(h);butt on equal.addActi on Liste ner(h);pan elwest.setLayout (new GridLayout(3,1);pan elwest.add(butt on zero);pan elwest.add(butt o

10、n dot);pan elwest.add(butt on equal);构造操作按钮 “ +”-”“ * ”“ /”“,s其中“ >0为归零按钮butto nplus=new JButto n("+"); butt onminus=new JButt on ("-"); butto nmultiple=new JButto n( "*"); butt on devisi on=new JButt on ("/"); butt onsin=new JButt on ("s in ”)； butto

11、ntozero=n ew JButto n( ">0");paneleast.setLayout(new GridLayout(3,1);/ 设置西边的布局为3 行 1 列将操作按钮“ +”-” “*”“ /” “添加到西边的面板中pan eleast.add(butt on plus);pan eleast.add(butt onminu s);pan eleast.add(butt onm ultiple);pan eleast.add(butt on devisi on);pan eleast.add(butt onsin);pan eleast.add(but

12、t on tozero);为操作按钮“ +”- ” “* ”“ /” “注册监听器>0 ”butt on plus.addAct ion Liste ner(h);butt onminu s.addAct ion Liste ner(h);butt onm ultiple.addAct ion Liste ner(h);butt on devisi on .addAct ion Liste ner(h);butt onsin. addActi on Liste ner(h);butt on tozero.addAct ion Liste ner(h);frame.setLayout(ne

13、w BorderLayout();/ 设置窗体为边界布局 frame.add(pa neleast,"East");将东边面板pan eleast添加到窗体的东边 frame.add(tf,BorderLayout.NORTH); /将tf文本区域添加到窗体的北边，即顶部 frame.add(panelwest,BorderLayout.WEST); 将 panelwest 面板添加到窗体西边 frame.add(panelcenter,BorderLayout.CENTER); 将 panelcenter 面板添加到窗体中间 frame.pack();/设置窗体大小，适合

14、其子组件的首选大小和布局 frame.setLocation(500,500);/ 设置窗体显示位置为(500,500) frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 设置布局窗体默认关闭方式frame.setVisible(true);/ 设置窗体可见public static void main( Stri ng args) new CalcultorThree();主方法中新建对象class Handle implements ActionListener 实现动作监听器类int biaozhi=0;此标志标志加减乘除操作do

15、uble flag仁0,flag2=0,flag3=0;/flag1 、flag2 为两个操作数，flag3 为结果 Overridepublic void actio nPerformed(Actio nEvent e) / 方法重写try/此处可能会产生异常，用try、catch捕捉异常，不用处理if(e.getSource()=buttondot) 小数点tf.setText("O.");if(e.getSource()=buttontozero)/ 归零操作tf.setText(”)；if(e.getSource()=buttonzero) 按键 0 操作 tf.s

16、etText(tf.getText()+"0");flag仁Double.parseDouble(tf.getText(); 将文本区域转换成Double 类型,赋给flag1if(e.getSource()=buttonone)/ 按键 1 操作tf.setText(tf.getText()+"1");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttontwo) 按键 2 操作tf.setText(tf.getText()+"2");flag 仁 Do

17、uble.parseDouble(tf.getText();else if(e.getSource()=buttonthree) 按键 3 操作tf.setText(tf.getText()+"3");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonfour) 按键 4 操作tf.setText(tf.getText()+"4");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonfiv

18、e)/ 按键 5 操作tf.setText(tf.getText()+"5");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonsix) 按键 6 操作tf.setText(tf.getText()+"6");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonseven) 按键 7 操作tf.setText(tf.getText()+"7");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttoneight) 按键 8 操作tf.setText(tf.getText()+"8");flag 仁 Double.parseDouble(tf.getText();else if(e.getSource()=buttonnine)/ 按键 9 操作tf.setText(tf.getText()+"9");flag 仁 Double.pars