JAVA编写的计算器源代码

1、package jsq;import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowEvent;import java.awt.event.WindowListener;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.sw

2、ing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.UIManager;public class Test implements ActionListener /* * */JFrame f = new JFrame();JTextField tf =

3、new JTextField(0.);JMenuBar bar=new JMenuBar();JMenu menuEdit=new JMenu(编辑(E);JMenu menuView=new JMenu(查看(V);JMenu menuHelp=new JMenu(帮助(H);JMenuItem menuEditCopy=new JMenuItem(复制(C);JMenuItem menuEditPaste=new JMenuItem(粘贴(V);JMenuItem menuHelpAbout = new JMenuItem(关于计算器(A); JPanel panel0 = new JPa

4、nel();JPanel panel2 = new JPanel();JPanel panel = new JPanel();JPanel panel3 = new JPanel();JPanel panel4 = new JPanel();JPanel panel5 = new JPanel();JButton btBk = new JButton( Backspace);JButton btCe = new JButton(Ce);JButton btCl = new JButton(C);JButton bt7 = new JButton(7);JButton bt8 = new JBu

5、tton(8);JButton bt9 = new JButton(9);JButton btDiv = new JButton(/);JButton btSqrt = new JButton(sqrt);JButton bt4 = new JButton(4);JButton bt5 = new JButton(5);JButton bt6 = new JButton(6);JButton btMult = new JButton(*);JButton btMol = new JButton( % );JButton bt1 = new JButton(1);JButton bt2 = ne

6、w JButton(2);JButton bt3 = new JButton(3);JButton btMinu = new JButton(-);JButton btCoun = new JButton( 1/x);JButton bt0 = new JButton(0);JButton btPoint = new JButton(.);JButton btEqual = new JButton(=);JButton btAdd = new JButton(+);JButton btSign = new JButton( +/-);/* * param args */public void

7、init()f.add(panel0);f.add(tf,North);f.setJMenuBar(bar);bar.add(menuEdit);bar.add(menuView);bar.add(menuHelp);menuEdit.add(menuEditCopy);menuEdit.add(menuEditPaste);menuHelp.add(menuHelpAbout); tf.setEditable(false);/不可编辑tf.setHorizontalAlignment(JTextField.RIGHT);/从右侧输入数据panel0.add(panel2);panel0.ad

8、d(panel);panel0.add(panel3);panel0.add(panel4);panel0.add(panel5);panel2.setLayout(new GridLayout(1,4);panel2.add(btBk);panel2.add(btCe);panel2.add(btCl);panel.setLayout(new GridLayout(1,5);panel.add(bt7);panel.add(bt8);panel.add(bt9);panel.add(btDiv);panel.add(btSqrt);/根号panel3.setLayout(new GridLa

9、yout(1,5);panel3.add(bt4);panel3.add(bt5);panel3.add(bt6);panel3.add(btMult);panel3.add(btMol);/百分号panel4.setLayout(new GridLayout(1,5);panel4.add(bt1);panel4.add(bt2);panel4.add(bt3);panel4.add(btMinu);panel4.add(btCoun);/倒数panel5.setLayout(new GridLayout(1,5);panel5.add(bt0);panel5.add(btPoint);pa

10、nel5.add(btAdd);panel5.add(btEqual);panel5.add(btSign);/正负符号btBk.setForeground(new Color(255, 0, 0);btCe.setForeground(new Color(255, 0, 0);btCl.setForeground(new Color(255, 0, 0);btAdd.setForeground(new Color(255, 0, 0);btMult.setForeground(new Color(255, 0, 0);btDiv.setForeground(new Color(255, 0,

11、 0);btMinu.setForeground(new Color(255, 0, 0);btEqual.setForeground(new Color(255, 0, 0);bt0.setForeground(new Color(0,0,255);bt1.setForeground(new Color(0, 0, 255);bt2.setForeground(new Color(0,0,255);bt3.setForeground(new Color(0,0,255);bt4.setForeground(new Color(0,0,255);bt5.setForeground(new Co

12、lor(0,0,255);bt6.setForeground(new Color(0,0,255);bt7.setForeground(new Color(0,0,255);bt8.setForeground(new Color(0,0,255);bt9.setForeground(new Color(0,0,255);btSqrt.setForeground(new Color(0,0,255);btMol.setForeground(new Color(0,0,255);btCoun.setForeground(new Color(0,0,255);btSign.setForeground

13、(new Color(0,0,255);/注册监听bt1.addActionListener(this);bt2.addActionListener(this);bt3.addActionListener(this);bt4.addActionListener(this);bt5.addActionListener(this);bt6.addActionListener(this);bt7.addActionListener(this);bt8.addActionListener(this);bt9.addActionListener(this);bt0.addActionListener(t

14、his);btAdd.addActionListener(this);btMinu.addActionListener(this);btMult.addActionListener(this);btDiv.addActionListener(this);btEqual.addActionListener(this);btPoint.addActionListener(this);btSqrt.addActionListener(this);btMol.addActionListener(this);btCoun.addActionListener(this);btSign.addActionL

15、istener(this);btBk.addActionListener(this);btCe.addActionListener(this);btCl.addActionListener(this);menuEditCopy.addActionListener(this);menuEditPaste.addActionListener(this);menuHelpAbout.addActionListener(this);f.addWindowListener(new MyWinLis();f.setTitle(计算器);f.setSize(295,240);f.setResizable(f

16、alse);/不能改变窗体大小f.setVisible(true);String foreNum=null;String currOpr=null;String currNum=null; boolean i = true; String copy;/复制public void actionPerformed(ActionEvent e) / TODO 自动生成方法存根Object obj=e.getSource();/输入数字if(obj=bt1|obj=bt2|obj=bt3|obj=bt4|obj=bt5|obj=bt6|obj=bt7|obj=bt8|obj=bt9|obj=bt0)i

17、f(i=true)tf.setText(e.getActionCommand();else tf.setText(tf.getText()+e.getActionCommand();i = false;/小数点else if(obj=btPoint)if(i=false) tf.setText(tf.getText()+.); /实现开根号else if(obj=btSqrt)if(tf.getText().charAt(0)=-)tf.setText(函数输入无效); elsetf.setText(Double.toString(java.lang.Math.sqrt(Double. par

18、seDouble(tf.getText(); i = true;/实现倒数else if(obj=btCoun)if (tf.getText().charAt(0) = 0) tf.setText(零不能求倒数);i = true; else String s = Double.toString(1 / Double.parseDouble(tf.getText(); foreNum = tf.getText(); tf.setText(s); i = true; /实现+/-符号 else if (obj = btSign) boolean isNumber = true;String s

19、= tf.getText(); for (int m = 0; m= 0 & s.charAt(m) =9 | s.charAt(m) =.| s.charAt(m) = -) break; if (isNumber = true) /如果当前字符串首字母有-号,代表现在是个负数,再按下时,则将首符号去掉 if (s.charAt(0) = -) tf.setText(); for (int m = 1; m s.length(); m+) char a = s.charAt(m); tf.setText(tf.getText() + a); /如果当前字符串第一个字符不是符号，则添加一个符号

20、在首字母处 else tf.setText(- + s); /实现%功能else if(obj=btMol)boolean isNumber = true;if(isNumber=true)tf.setText(String.valueOf(Double.parseDouble(tf.getText()/100);elsetf.setText(错误);/实现符号运算else if(obj=btAdd|obj=btMinu|obj=btDiv|obj=btMult)if(i=false)currNum=tf.getText();if(currOpr=+)tf.setText(String.val

21、ueOf(Double.parseDouble(foreNum)+Double.parseDouble(currNum);else if(currOpr=-)tf.setText(String.valueOf(Double.parseDouble(foreNum)-Double.parseDouble(currNum);else if(currOpr=*)tf.setText(String.valueOf(Double.parseDouble(foreNum)*Double.parseDouble(currNum);else if(currOpr=/)if (Double.parseDoubl

22、e(tf.getText() = 0) tf.setText(除数不能为零); else tf.setText(String.valueOf(Double.parseDouble(foreNum)/Double.parseDouble(currNum);foreNum=tf.getText();tf.setText();currOpr=e.getActionCommand();i = false;/实现等号else if(obj=btEqual)currNum=tf.getText();if(currOpr=+)tf.setText(String.valueOf(Double.parseDou

23、ble(foreNum)+Double.parseDouble(currNum);else if(currOpr=-)tf.setText(String.valueOf(Double.parseDouble(foreNum)-Double.parseDouble(currNum);else if(currOpr=*)tf.setText(String.valueOf(Double.parseDouble(foreNum)*Double.parseDouble(currNum);else if(currOpr=/)if (Double.parseDouble(tf.getText() = 0)

24、tf.setText(除数不能为零); elsetf.setText(String.valueOf(Double.parseDouble(foreNum)/Double.parseDouble(currNum);currOpr=e.getActionCommand();i = true;/实现Backspace功能else if(obj=btBk)String s = tf.getText();tf.setText();for (int m = 0;m s.length() - 1; m+) char a = s.charAt(m); tf.setText(tf.getText() + a); i = true;/实现Ce功能else if (obj = btCe) tf.setText(0.); /实现C功能else if (obj = btCl) foreNum=currNum=; tf.setText(0.);/实现复制else if(obj=menuEditCopy)copy=tf.getText();/实现粘贴else if (obj = menuEditPaste) tf.setText(copy); /实现帮助主题else if(obj = menuHelpAbout)ImageIcon ico