java计算器源代码

package 计算器;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.math.BigDecimal;import javax.swing.BorderFactory;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;import javax.swing.border.BevelBorder;import javax.swing.text.BadLocationException;public class Counter1 extends JFrame implements ActionListener public static final int DEF_DIV_SCALE = 10; /默认的精度private JMenuBar jmBar = new JMenuBar(); / 菜单条private JMenu edit = new JMenu(“编辑(E)“);private JMenu find = new JMenu(“查看(V)“);private JMenu help = new JMenu(“帮助(H)“);/ 创建JPanel 便于管理private JPanel panTxt = new JPanel();private JPanel panBack = new JPanel();private JPanel panMen = new JPanel();private JPanel panNum = new JPanel();/ 创建文本域private JTextField txt = new JTextField();/ 创建文本标签private JLabel jlm = new JLabel();private boolean flag = false; / 是否可以消除文本private double a = 0; / 数字a的值private double b = 0; / 数字b的值private double result = 0; / 两个数字运算的结果private String sign = “; / 标记运算法则private double m = 0; / 暂时储存数据/ 创建按钮private NewButton jbBack = new NewButton(“Backspace“, Color.RED);private NewButton jbCE = new NewButton(“CE“, Color.RED);private NewButton jbC = new NewButton(“C“, Color.RED);private NewButton jbMC = new NewButton(“MC“, Color.RED);private NewButton jbMR = new NewButton(“MR“, Color.RED);private NewButton jbMS = new NewButton(“MS“, Color.RED);private NewButton jbM = new NewButton(“M+“, Color.RED);public Counter1() setSize(260, 260);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setLocationRelativeTo(null);setLayout(null);setJMenuBar(jmBar);setTitle(“计算器“ );setResizable(false);init();/ Container contentPane = getContentPane();/ Controller c = new Controller(this);/ contentPane.addKeyListener(c);private void init() / 设置第一个JPanel里面的内容panTxt.setSize(230, 20);panTxt.setLocation(15, 5);/ panTxt.setBorder(BorderFactory.createLineBorder(Color.RED);panTxt.setLayout(new BorderLayout(); / 设置布局管理器txt.setHorizontalAlignment(JTextField.RIGHT); / 使光标定位在右边txt.setBorder(BorderFactory.createLoweredBevelBorder(); / 设置边框凹下去txt.setEditable(false); / 设置是否可以编辑txt.setBackground(Color.WHITE);/ txt.setEnabled(true); /设置是否激活/ txt.setFocusable(false); / 设置是否可以获得焦点（显示光标）txt.setText(“0“);add(panTxt);panTxt.add(txt);Controller c = new Controller(this);txt.addKeyListener(c);/ 设置第二个JPanel里面的内容panBack.setSize(190, 25);panBack.setLocation(52, 35);/ 画出边框便于查看/ panBack.setBorder(BorderFactory.createLineBorder(Color.RED);GridLayout layPanBack = new GridLayout(); / 创建布局管理器layPanBack.setHgap(5); / 设置布局管理器的边距panBack.setLayout(layPanBack); / 设置布局管理器/ 添加按钮jbBack.setFont(new Font(“宋体“ , 0, 12);panBack.add(jbBack);panBack.add(jbCE);panBack.add(jbC);add(panBack);/ 设置第三个JPanel里面的内容panMen.setSize(40, 140);panMen.setLocation(5, 65);GridLayout layPanMen = new GridLayout(4, 1); / 创建布局管理器layPanMen.setVgap(5); / 设置布局管理器的边距panMen.setLayout(layPanMen);/ panMen.setBorder(BorderFactory.createLineBorder(Color.RED);panMen.add(jbMC);panMen.add(jbMR);panMen.add(jbMS);panMen.add(jbM);add(panMen);/ 设置第四个JPanel里面的内容panNum.setSize(200, 140);panNum.setLocation(50, 65);/ panNum.setBorder(BorderFactory.createLineBorder(Color.RED);add(panNum);GridLayout layPanNum = new GridLayout(4, 5); / 创建布局管理器panNum.setLayout(layPanNum);newButtonNum();/ 添加菜单项jmBar.add(edit);jmBar.add(find);jmBar.add(help);/ 设置文本标签的属性和添加文本标签jlm.setBorder(BorderFactory.createBevelBorder(1);jlm.setSize(25, 25);jlm.setLocation(15, 35);add(jlm);public void newButtonNum() NewButton jb7 = new NewButton(“7“, Color.BLUE);NewButton jb8 = new NewButton(“8“, Color.BLUE);NewButton jb9 = new NewButton(“9“, Color.BLUE);NewButton jbDivide = new NewButton(“/“, Color.RED);NewButton jbSqrt = new NewButton(“sqrt“, Color.BLUE);NewButton jb4 = new NewButton(“4“, Color.BLUE);NewButton jb5 = new NewButton(“5“, Color.BLUE);NewButton jb6 = new NewButton(“6“, Color.BLUE);NewButton jbRide = new NewButton(“*“, Color.RED);NewButton jbPer = new NewButton(“%“, Color.BLUE);NewButton jb1 = new NewButton(“1“, Color.BLUE);NewButton jb2 = new NewButton(“2“, Color.BLUE);NewButton jb3 = new NewButton(“3“, Color.BLUE);NewButton jbCut = new NewButton(“-“, Color.RED);NewButton jbReciprocal = new NewButton(“1/x“, Color.BLUE);NewButton jb0 = new NewButton(“0“, Color.BLUE);NewButton jbMinus = new NewButton(“+/-“, Color.BLUE);NewButton jbDot = new NewButton(“.“, Color.BLUE);NewButton jbAdd = new NewButton(“+“, Color.RED);NewButton jbEquals = new NewButton(“=“, Color.RED);panNum.add(jb7);panNum.add(jb8);panNum.add(jb9);panNum.add(jbDivide);panNum.add(jbSqrt);panNum.add(jb4);panNum.add(jb5);panNum.add(jb6);panNum.add(jbRide);panNum.add(jbPer);panNum.add(jb1);panNum.add(jb2);panNum.add(jb3);panNum.add(jbCut);panNum.add(jbReciprocal);panNum.add(jb0);panNum.add(jbMinus);panNum.add(jbDot);panNum.add(jbAdd);panNum.add(jbEquals);public static void main(String args) try UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName(); / 设置和win7的布局一样 catch (ClassNotFoundException e) e.printStackTrace(); catch (InstantiationException e) e.printStackTrace(); catch (IllegalAccessException e) e.printStackTrace(); catch (UnsupportedLookAndFeelException e) e.printStackTrace();new Counter1().setVisible(true);private class NewButton extends JButton public NewButton(String s, Color c) super(s);/ setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED);setBorder(BorderFactory.createEmptyBorder();setForeground(c);setFocusable(false); / 设置是否可以获得焦点（显示光标）addActionListener(Counter1.this);/ 实现监听public void actionPerformed(ActionEvent e) if (e.getActionCommand() = “+“) a = Double.parseDouble(txt.getText();sign = “+“;flag = true; else if (e.getActionCommand() = “-“) a = Double.parseDouble(txt.getText();sign = “-“;flag = true; else if (e.getActionCommand() = “*“) a = Double.parseDouble(txt.getText();sign = “*“;flag = true; else if (e.getActionCommand() = “/“) a = Double.parseDouble(txt.getText();sign = “/“;flag = true; else if (e.getActionCommand() = “=“) try b = Double.parseDouble(txt.getText(); catch (NumberFormatException nfe) b = 0;try if (sign = “+“) result = doubleAdd(a, b); else if (sign = “-“) result = doubleSub(a, b); else if (sign = “*“) result = doubleMul(a, b); else if (sign = “/“ else result = b; catch (NumberFormatException nfe) result = 0;a = result;if (sign = “/“ else txt.setText(result + “);flag = true; else if (e.getActionCommand() = “C“) a = 0;result = 0;sign = “;txt.setText(“0“); else if (e.getActionCommand() = “CE“) txt.setText(“0“); else if (e.getActionCommand() = “Backspace“) try if (txt.getText().length() 1) txt.setText(txt.getText(0, txt.getText().length() - 1); else txt.setText(“0“); catch (BadLocationException e1) txt.setText(“0“); else if (e.getActionCommand() = “sqrt“) a = Double.parseDouble(txt.getText();result = Math.sqrt(a);a = result;txt.setText(result + “);flag = true; else if (e.getActionCommand() = “%“) b = Double.parseDouble(txt.getText();result = doubleMul(doubleDiv(b, 100), a);txt.setText(result + “);flag = true; else if (e.getActionCommand() = “1/x“) a = Double.parseDouble(txt.getText();result = 1 / a;a = result;txt.setText(result + “);flag = true; else if (e.getActionCommand() = “+/-“) txt.setText(“ + (-Double.parseDouble(txt.getText(); else if (e.getActionCommand() = “MC“) m = 0;jlm.setText(“); else if (e.getActionCommand() = “MR“) txt.setText(m + “); else if (e.getActionCommand() = “MS“) m = Double.parseDouble(txt.getText();jlm.setText(“ M“);flag = true; else if (e.getActionCommand() = “M+“) m += Double.parseDouble(txt.getText();flag = true; else boolean isDoc = false;for (int i = 0; i 1) txt.setText(txt.getText(0, txt.getText().length() - 1); else txt.setText(“0“); catch (BadLocationException e1) txt.setText(“0“); else if (e.getKeyChar() = %) b = Double.parseDouble(txt.getText();result = doubleMul(doubleDiv(b, 100), a);txt.setText(result + “);flag = true; else if (e.getKeyChar() = 0x30 for (int i = 0; i txt.getText().length(); i+) if (txt.getText().charAt(i) = .) isDoc = true;if (!isDoc | e.getKeyChar() != .) if (flag) txt.setText(“);flag = false;if (txt.getText().equals(“0“) txt.setText(txt.getText() + e.getKeyChar();private class Controller extends KeyAdapter private Counter1 frame;public Controller(Counter1 frame) this.frame = frame;public void keyPressed(KeyEvent e) frame.keyAction(e);/ 提供相对精确的加法运算public static double doubleAdd(double d1, double d2) BigDecimal bd1 = new BigDecimal(Double.toString(d1);BigDecimal bd2 = new BigDecimal(Double.toString(d2);retur