Java图形用户界面实验
package com.zhangyufan.gui;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestCalculator {
public static void main(String args[]) {
Calculator calculator = new Calculator();
}
}
class Calculator extends Frame implements ActionListener, WindowListener{
private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;
private String lastCommand;
private double result;
private boolean start;
private JMenuBar menubar;
private JMenuItem m_exit;
private JMenuItem m2_ejz;
private JMenuItem m2_bjz;
private Dialog dialog;
private Label label_dialog;
private JButton button_sqrt;
private JButton button_remainder;
private JButton button_CE;
private JButton button_cancel;
private JButton button_1;
private JButton button_2;
private JButton button_3;
private JButton button_4;
private JButton button_5;
private JButton button_6;
private JButton button_7;
private JButton button_8;
private JButton button_9;
private JButton button_0;
private JButton button_plus;
private JButton button_minus;
private JButton button_multiply;
private JButton button_divide;
private JButton button_point;
private JButton button_equal;
private JButton button_log;
private JButton button_tan;
private JButton button_cos;
private JButton button_sin;
private JButton button_exp;
public Calculator() {
super("小明同学的Swing版计算器");
this.setLocation(350, 150);
this.setSize(450, 400);
this.setResizable(true);
this.setLayout(new GridLayout(7, 1));
this.addmyMenu();
displayField = new JTextField(30);
this.add(displayField);
displayField.setEditable(true);
start = true;
result = 0;
lastCommand = "=";
JPanel panel0 = new JPanel();
panel0.setLayout(new GridLayout(1, 4, 4, 4));
JPanel panel1 = new JPanel();
panel1.setLayout(new GridLayout(1, 5, 4, 4));
this.add(panel1);
button_sqrt = new JButton("sqrt");
button_remainder = new JButton("%");
button_exp = new JButton("exp");
button_CE = new JButton("退位");
button_cancel = new JButton("c");
JPanel panel2 = new JPanel();
panel2.setLayout(new GridLayout(1, 5, 4, 4));
this.add(panel2);
button_7 = new JButton("7");
button_8 = new JButton("8");
button_9 = new JButton("9");
button_log = new JButton("log");
button_divide = new JButton("/");
JPanel panel3 = new JPanel();
panel3.setLayout(new GridLayout(1, 5, 4, 4));
this.add(panel3);
button_4 = new JButton("4");
button_5 = new JButton("5");
button_6 = new JButton("6");
button_tan = new JButton("tan");
button_multiply = new JButton("*");
JPanel panel4 = new JPanel();
panel4.setLayout(new GridLayout(1, 5, 4, 4));
this.add(panel4);
button_1 = new JButton("1");
button_2 = new JButton("2");
button_3 = new JButton("3");
button_cos = new JButton("cos");
button_minus = new JButton("-");
JPanel panel5 = new JPanel();
panel5.setLayout(new GridLayout(1, 5, 4, 4));
this.add(panel5);
button_0 = new JButton("0");
button_point = new JButton(".");
button_equal = new JButton("=");
button_sin = new JButton("sin");
button_plus = new JButton("+");
panel1.add(button_sqrt);
panel1.add(button_remainder);
panel1.add(button_exp);
panel1.add(button_CE);
panel1.add(button_cancel);
panel2.add(button_7);
panel2.add(button_8);
panel2.add(button_9);
panel2.add(button_log);
panel2.add(button_divide);
panel3.add(button_4);
panel3.add(button_5);
panel3.add(button_6);
panel3.add(button_tan);
panel3.add(button_multiply);
panel4.add(button_1);
panel4.add(button_2);
panel4.add(button_3);
panel4.add(button_cos);
panel4.add(button_minus);
panel5.add(button_0);
panel5.add(button_point);
panel5.add(button_equal);
panel5.add(button_sin);
panel5.add(button_plus);
button_sqrt.addActionListener(this);
button_remainder.addActionListener(this);
button_exp.addActionListener(this);
button_CE.addActionListener(this);
button_cancel.addActionListener(this);
button_7.addActionListener(this);
button_8.addActionListener(this);
button_9.addActionListener(this);
button_log.addActionListener(this);
button_divide.addActionListener(this);
button_4.addActionListener(this);
button_5.addActionListener(this);
button_6.addActionListener(this);
button_tan.addActionListener(this);
button_multiply.addActionListener(this);
button_1.addActionListener(this);
button_2.addActionListener(this);
button_3.addActionListener(this);
button_cos.addActionListener(this);
button_minus.addActionListener(this);
button_0.addActionListener(this);
button_point.addActionListener(this);
button_equal.addActionListener(this);
button_sin.addActionListener(this);
button_plus.addActionListener(this);
this.addWindowListener(new WinClose());
this.setVisible(true);
}
private void addmyMenu() {
JMenuBar menubar = new JMenuBar();
this.add(menubar);
JMenu m1 = new JMenu("选项");
JMenu m2 = new JMenu("进制转换");
JMenuItem m1_exit = new JMenuItem("退出");
m1_exit.addActionListener(this);
JMenuItem m2_ejz = new JMenuItem("二进制");
m2_ejz.addActionListener(this);
JMenuItem m2_bjz = new JMenuItem("八进制");
m2_bjz.addActionListener(this);
JMenuItem m2_sljz = new JMenuItem("十六进制");
m2_sljz.addActionListener(this);
JMenuItem m2_dao_shu = new JMenuItem("倒数");
m2_dao_shu.addActionListener(this);
JMenu m3 = new JMenu("帮助");
JMenuItem m3_Help = new JMenuItem("用法");
m3_Help.addActionListener(this);
dialog = new Dialog(this, "提示", true);
dialog.setSize(240, 80);
label_dialog = new Label("", Label.CENTER);
dialog.add(label_dialog);
dialog.addWindowListener(this);
m1.add(m1_exit);
menubar.add(m1);
m2.add(m2_ejz);
m2.add(m2_bjz);
m2.add(m2_sljz);
m2.add(m2_dao_shu);
menubar.add(m2);
m3.add(m3_Help);
menubar.add(m3);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource().equals(button_1) || e.getSource().equals(button_2) || e.getSource().equals(button_3)
|| e.getSource().equals(button_4) || e.getSource().equals(button_5) || e.getSource().equals(button_6)
|| e.getSource().equals(button_7) || e.getSource().equals(button_8) || e.getSource().equals(button_9)
|| e.getSource().equals(button_0) || e.getSource().equals(button_point)
|| e.getSource().equals(button_cancel) || e.getSource().equals(button_CE)) {
String input = e.getActionCommand();
if (start) {
displayField.setText("");
start = false;
if (input.equals("+/-"))
displayField.setText(displayField.getText() + "-");
}
if (!input.equals("+/-")) {
String str = displayField.getText();
if (input.equals("退位")) {
if (str.length() > 0)
displayField.setText(str.substring(0, str.length() - 1));
}else if (input.equals("c")) {
displayField.setText("");
start = true;
} else
displayField.setText(displayField.getText() + input);
}
}else if (e.getActionCommand() == "二进制") {
int n = Integer.parseInt(displayField.getText());
displayField.setText(Integer.toBinaryString(n));
}else if (e.getActionCommand() == "八进制") {
int n = Integer.parseInt(displayField.getText());
displayField.setText(Integer.toOctalString(n));
}else if (e.getActionCommand() == "十六进制") {
int n = Integer.parseInt(displayField.getText());
displayField.setText(Integer.toHexString(n));
}else if (e.getActionCommand() == "倒数") {
Double n = Double.parseDouble(displayField.getText());
displayField.setText(String.valueOf(1 / n));
}else if (e.getActionCommand() == "退出") {
System.exit(0);
}else if (e.getActionCommand() == "用法") {
label_dialog.setText("欢迎使用小明同学的Swing版计算器，进制转换先录入数字最后再点击几进制选项，sqrt,exp等键是先输运算符再输数字。");
dialog.setLocation(400, 250);
dialog.setVisible(true);
}else {
String command = e.getActionCommand();
if (start) {
lastCommand = command;
} else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand = command;
start = true;
}
}
}
public void calculate(double x) {
double d = 0;
if (lastCommand.equals("+"))
result += x;
else if (lastCommand.equals("-"))
result -= x;
else if (lastCommand.equals("*"))
result *= x;
else if (lastCommand.equals("/"))
result /= x;
else if (lastCommand.equals("%"))
result %= x;
else if (lastCommand.equals("="))
result = x;
else if (lastCommand.equals("sqrt")) {
d = Math.sqrt(x);
result = d;
} else if (lastCommand.equals("exp")) {
d = Math.exp(x);
result = d;
} else if (lastCommand.equals("log")) {
d = Math.log(x);
result = d;
} else if (lastCommand.equals("tan")) {
d = Math.tan(x);
result = d;
} else if (lastCommand.equals("cos")) {
d = Math.cos(x);
result = d;
} else if (lastCommand.equals("sin")) {
d = Math.sin(x);
result = d;
}
displayField.setText("" + result);
}
public void windowClosing(WindowEvent e) {
if (e.getSource() == dialog)
dialog.setVisible(false);
else
System.exit(0);
}
public void windowOpened(WindowEvent e) {
}
public void windowActivated(WindowEvent e) {
}
public void windowDeactivated(WindowEvent e) {
}
public void windowClosed(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowDeiconified(WindowEvent e) {
}
public static void main(String args[]) {
Calculator calculator = new Calculator();
}
}
class WinClose implements WindowListener {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
public void windowOpened(WindowEvent e) {
}
public void windowActivated(WindowEvent e) {
}
public void windowDeactivated(WindowEvent e) {
}
public void windowClosed(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowDeiconified(WindowEvent e) {
}
}