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1、package 計(jì)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;
im
2、port 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.UnsupportedLook
3、AndFeelException;
import ;
import javax.swing.text.BadLocationException;
public class Counter1 extends JFrame implements ActionListener {
public static final int DEF_DIV_SCALE = 10; //默認(rèn)的精度
private JMenuBar jmBar = new JMenuBar(); // 菜單條
private JMenu edit = new JMenu("編輯(E)");
privat
4、e JMenu find = new JMenu("查看(V)");
private JMenu help = new JMenu("幫助(H)");
// 創(chuàng)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();
// 創(chuàng)建文本域
private JTextField txt = new
5、 JTextField();
// 創(chuàng)建文本標(biāo)簽
private JLabel jlm = new JLabel();
private boolean flag = false; // 是否可以消除文本
private double a = 0; // 數(shù)字a的值
private double b = 0; // 數(shù)字b的值
private double result = 0; // 兩個(gè)數(shù)字運(yùn)算的結(jié)果
private String sign = ""; // 標(biāo)記運(yùn)算法則
private double m = 0; // 暫時(shí)儲(chǔ)存數(shù)據(jù)
// 創(chuàng)建按
6、鈕
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.RE
7、D);
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);
setT
8、itle("計(jì)算器");
setResizable(false);
init();
// Container contentPane = getContentPane();
// Controller c = new Controller(this);
// contentPane.addKeyListener(c);
}
private void init() {
// 設(shè)置第一個(gè)JPanel里面的內(nèi)容
panTxt.setSize(230, 20);
panTxt.setLocation(15, 5);
// panTxt.
9、setBorder(BorderFactory.createLineBorder(Color.RED));
panTxt.setLayout(new BorderLayout()); // 設(shè)置布局管理器
txt.setHorizontalAlignment(JTextField.RIGHT); // 使光標(biāo)定位在右邊
txt.setBorder(BorderFactory.createLoweredBevelBorder()); // 設(shè)置邊框凹下去
txt.setEditable(false); // 設(shè)置是否可以編輯
txt.setBackground(Co
10、lor.WHITE);
// txt.setEnabled(true); //設(shè)置是否激活
// txt.setFocusable(false); // 設(shè)置是否可以獲得焦點(diǎn)（顯示光標(biāo)）
txt.setText("0");
add(panTxt);
panTxt.add(txt);
Controller c = new Controller(this);
txt.addKeyListener(c);
// 設(shè)置第二個(gè)JPanel里面的內(nèi)容
panBack.setSize(190, 25);
panBack.setLocation(
11、52, 35);
// 畫出邊框便于查看
// panBack.setBorder(BorderFactory.createLineBorder(Color.RED));
GridLayout layPanBack = new GridLayout(); // 創(chuàng)建布局管理器
layPanBack.setHgap(5); // 設(shè)置布局管理器的邊距
panBack.setLayout(layPanBack); // 設(shè)置布局管理器
// 添加按鈕
jbBack.setFont(new Font("宋體", 0, 12));
panBack.a
12、dd(jbBack);
panBack.add(jbCE);
panBack.add(jbC);
add(panBack);
// 設(shè)置第三個(gè)JPanel里面的內(nèi)容
panMen.setSize(40, 140);
panMen.setLocation(5, 65);
GridLayout layPanMen = new GridLayout(4, 1); // 創(chuàng)建布局管理器
layPanMen.setVgap(5); // 設(shè)置布局管理器的邊距
panMen.setLayout(layPanMen);
// panMen.se
13、tBorder(BorderFactory.createLineBorder(Color.RED));
panMen.add(jbMC);
panMen.add(jbMR);
panMen.add(jbMS);
panMen.add(jbM);
add(panMen);
// 設(shè)置第四個(gè)JPanel里面的內(nèi)容
panNum.setSize(200, 140);
panNum.setLocation(50, 65);
// panNum.setBorder(BorderFactory.createLineBorder(Color.RED)
14、);
add(panNum);
GridLayout layPanNum = new GridLayout(4, 5); // 創(chuàng)建布局管理器
panNum.setLayout(layPanNum);
newButtonNum();
// 添加菜單項(xiàng)
jmBar.add(edit);
jmBar.add(find);
jmBar.add(help);
// 設(shè)置文本標(biāo)簽的屬性和添加文本標(biāo)簽
jlm.setBorder(BorderFactory.createBevelBorder(1));
jlm.setSize(25,
15、 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);
NewBu
16、tton 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
17、.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 Ne
18、wButton("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(j
19、b9);
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.a
20、dd(jbMinus);
panNum.add(jbDot);
panNum.add(jbAdd);
panNum.add(jbEquals);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); // 設(shè)置和win7的布局一樣
} catch (ClassNotFoundException e) {
e.printStackTrace();
} c
21、atch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
new Counter1().setVisible(true);
}
private class NewButton extends JButton {
public N
22、ewButton(String s, Color c) {
super(s);
// setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
setBorder(BorderFactory.createEmptyBorder());
setForeground(c);
setFocusable(false); // 設(shè)置是否可以獲得焦點(diǎn)（顯示光標(biāo)）
addActionListener(Counter1.this);
}
}
// 實(shí)現(xiàn)監(jiān)聽
public
23、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.getActionCo
24、mmand() == "*") {
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(tx
25、t.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 == "/" && b
26、 != 0) {
result = doubleDiv(a, b, 15);
} else {
result = b;
}
} catch (NumberFormatException nfe) {
result = 0;
}
a = result;
if (sign == "/" && b == 0) {
txt.setText("0");
} else {
txt.setText(result + "");
}
flag = true;
} else if
27、 (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,
28、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
29、 + "");
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());
30、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() =
31、= "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 isDo
32、c = false;
for (int i = 0; i < txt.getText().length(); i++) {
if (txt.getText().charAt(i) == '.') {
isDoc = true;
}
}
if (!isDoc || e.getActionCommand() != ".") {
if (flag) {
txt.setText("");
flag = false;
}
if (txt.getText().equals("0") && e.
33、getActionCommand() != ".") {
txt.setText("");
}
txt.setText(txt.getText() + e.getActionCommand());
}
}
}
// 實(shí)現(xiàn)鍵盤監(jiān)聽
public void keyAction(KeyEvent e) {
if (e.getKeyChar() == '+') {
a = Double.parseDouble(txt.getText());
sign = "+";
flag = true;
} else
34、if (e.getKeyChar() == '-') {
a = Double.parseDouble(txt.getText());
sign = "-";
flag = true;
} else if (e.getKeyChar() == '*') {
a = Double.parseDouble(txt.getText());
sign = "*";
flag = true;
} else if (e.getKeyChar() == '/') {
a = Double.parseDouble(txt.getText())
35、;
sign = "/";
flag = true;
} else if (e.getKeyChar() == '=') {
try {
b = Double.parseDouble(txt.getText());
} catch (NumberFormatException nfe) {
b = 0;
}
try {
if (sign == "+") {
result = doubleAdd(a, b);
} else if (sign == "-") {
result
36、= doubleSub(a, b);
} else if (sign == "*") {
result = doubleMul(a, b);
} else if (sign == "/") {
if (b == 0) {
txt.setText("除數(shù)不能為0");
} else {
result = doubleDiv(a, b, 15);
}
} else {
result = b;
}
} catch (NumberFormatException nfe
37、) {
result = 0;
}
a = result;
if (sign == "/" && b == 0) {
txt.setText("0");
} else {
txt.setText(result + "");
}
flag = true;
} else if (e.getKeyChar() == 'c' || e.getKeyChar() == 'C') {
a = 0;
result = 0;
sign = "";
txt.setText("0");
} e
38、lse if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {
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.getKey
39、Char() == '%') {
b = Double.parseDouble(txt.getText());
result = doubleMul(doubleDiv(b, 100), a);
txt.setText(result + "");
flag = true;
} else {
if (e.getKeyChar() >= 0x30 && e.getKeyChar() <= 0x39
|| e.getKeyChar() == '.') {
boolean isDoc = false;
for (int i
40、= 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") && e.getKeyChar() != '.') {
41、
txt.setText("");
}
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) {
42、 frame.keyAction(e);
}
}
// 提供相對(duì)精確的加法運(yùn)算
public static double doubleAdd(double d1, double d2) {
BigDecimal bd1 = new BigDecimal(Double.toString(d1));
BigDecimal bd2 = new BigDecimal(Double.toString(d2));
return bd1.add(bd2).doubleValue();
}
// 提供相對(duì)精確的減法運(yùn)算
public static dou
43、ble doubleSub(double d1, double d2) {
BigDecimal bd1 = new BigDecimal(Double.toString(d1));
BigDecimal bd2 = new BigDecimal(Double.toString(d2));
return bd1.subtract(bd2).doubleValue();
}
// 提供相對(duì)精確的乘法運(yùn)算
public static double doubleMul(double d1, double d2) {
BigDecimal bd1 = new B
44、igDecimal(Double.toString(d1));
BigDecimal bd2 = new BigDecimal(Double.toString(d2));
return bd1.multiply(bd2).doubleValue();
}
// 提供相對(duì)精確的除法運(yùn)算，當(dāng)發(fā)生除不盡的情況時(shí)，精確到 小數(shù)點(diǎn)以后10位，以后的數(shù)字四舍五入。
public static double doubleDiv(double d1, double d2) {
return doubleDiv(d1, d2, DEF_DIV_SCALE);
}
/
45、/ 提供（相對(duì)）精確的除法運(yùn)算。當(dāng)發(fā)生除不盡的情況時(shí)，由scale參數(shù)指 定精度，以后的數(shù)字四舍五入。
public static double doubleDiv(double d1, double d2, int scale) {
if (scale < 0) {
throw new IllegalArgumentException(
"The scale must be a positiveinteger or zero");
}
BigDecimal bd1 = new BigDecimal(Double.toString(d1));
BigDecimal bd2 = new BigDecimal(Double.toString(d2));
return bd1.divide(bd2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
}
}
java計(jì)算器源代碼
