Question

java初学者求小程序代码

rt

Answer 1

//java计算器===========import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.util.Dictionary;import javax.swing.*;public class Calculator extends JFrame {
private JTextField jtf;
private JPanel panel1, panel2, panel3, panel4;
private num numActionListener;
private JTextField jtf1;
private boolean IfResult = true;
private boolean point;
private String oper = "=";
private double result = 0;
private JMenuBar mybar;
private JMenu menu1, menu2, menu3;
private JMenuItem edititem1, edititem2, help1, help2, help3;
private JRadioButtonMenuItem seeitem1, seeitem2;
private JCheckBoxMenuItem seeitem3;
private ButtonGroup bgb;
private String back;
private DecimalFormat df;
private boolean Resultr = false;
private boolean flag = false; public Calculator(String title) {
super(title);
this.setLayout(new BorderLayout(10, 5));
panel1 = new JPanel(new GridLayout(1, 3, 10, 10));
panel2 = new JPanel(new GridLayout(4, 5, 5, 5));
panel3 = new JPanel(new BorderLayout(5, 5));
panel4 = new JPanel(new GridLayout(5, 1, 3, 5)); df = new DecimalFormat("0.#####"); mybar = new JMenuBar();
menu1 = new JMenu("编辑(E)");
menu2 = new JMenu("查看(V)");
menu3 = new JMenu("帮助(H)"); menu1.setMnemonic('E');
menu2.setMnemonic('V');
menu3.setMnemonic('H'); menu1.setFont(new Font("宋体", Font.PLAIN, 12));
menu2.setFont(new Font("宋体", Font.PLAIN, 12));
menu3.setFont(new Font("宋体", Font.PLAIN, 12)); edititem1 = new JMenuItem("复制(C)");
edititem2 = new JMenuItem("粘贴(P)"); edititem1.setIcon(new ImageIcon("icons/copy.png"));
edititem2.setIcon(new ImageIcon("icons/paste.png")); bgb = new ButtonGroup(); seeitem1 = new JRadioButtonMenuItem("标准型(T)");
seeitem2 = new JRadioButtonMenuItem("科学型(S)");
seeitem3 = new JCheckBoxMenuItem("数字分组(I)"); help1 = new JMenuItem("关于计算器(A)");
help2 = new JMenuItem("帮助主题(H)"); help1.addActionListener(new clear()); help1.setIcon(new ImageIcon("icons/about.png"));
help2.setIcon(new ImageIcon("icons/help.png")); bgb.add(seeitem1);
bgb.add(seeitem2); menu1.add(edititem1);
menu1.add(edititem2); menu2.add(seeitem1);
menu2.add(seeitem2);
menu2.addSeparator();
menu2.add(seeitem3); menu3.add(help1);
menu3.addSeparator();
menu3.add(help2); mybar.add(menu1);
mybar.add(menu2);
mybar.add(menu3);
this.setJMenuBar(mybar); edititem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
InputEvent.CTRL_MASK)); edititem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_P,
InputEvent.CTRL_MASK)); seeitem1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_T,
InputEvent.CTRL_MASK)); seeitem2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
InputEvent.CTRL_MASK)); seeitem3.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_I,
InputEvent.CTRL_MASK)); help1.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,
InputEvent.CTRL_MASK));
help2.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_H,
InputEvent.CTRL_MASK)); jtf = new JTextField(20);
jtf.setEditable(false);
jtf.setBackground(Color.white);
jtf.setHorizontalAlignment(JTextField.RIGHT);
jtf.setText("0");
jtf.setBorder(BorderFactory.createLoweredBevelBorder()); numActionListener = new num();
init(); } public void init() {
// panel 面板按钮的添加 addButton(panel1, "Blackspace", new clear(), Color.red);
addButton(panel1, "CE", null, Color.red);
addButton(panel1, "C", new clear(), Color.red); addButton(panel2, "7", numActionListener, Color.blue);
addButton(panel2, "8", numActionListener, Color.blue);
addButton(panel2, "9", numActionListener, Color.blue);
addButton(panel2, "/", new signs(), Color.red);
addButton(panel2, "sqrt", new signs(), Color.blue); addButton(panel2, "4", numActionListener, Color.blue);
addButton(panel2, "5", numActionListener, Color.blue);
addButton(panel2, "6", numActionListener, Color.blue);
addButton(panel2, "*", new signs(), Color.red);
addButton(panel2, "%", new signs(), Color.blue); addButton(panel2, "1", numActionListener, Color.blue);
addButton(panel2, "2", numActionListener, Color.blue);
addButton(panel2, "3", numActionListener, Color.blue);
addButton(panel2, "-", new signs(), Color.red);
addButton(panel2, "1/x", new signs(), Color.blue); addButton(panel2, "0", numActionListener, Color.blue);
addButton(panel2, "-/+", new clear(), Color.blue);
addButton(panel2, ".", new dot(), Color.blue);
addButton(panel2, "+", new signs(), Color.red);
addButton(panel2, "=", new signs(), Color.red); JButton btns = new JButton(""); btns.setBorder(BorderFactory.createLoweredBevelBorder());
btns.setEnabled(false);
btns.setPreferredSize(new Dimension(10, 10));
// panel4面板按钮的添加
panel4.add(btns);
addButton(panel4, "MC", null, Color.red);
addButton(panel4, "MR", null, Color.red);
addButton(panel4, "MS", null, Color.red);
addButton(panel4, "M+", null, Color.red);
// 将面板添加倒顶层容器中 panel3.add(panel1, BorderLayout.NORTH);
panel3.add(panel2, BorderLayout.CENTER);
add(jtf, BorderLayout.NORTH);
add(panel3);
add(panel4, BorderLayout.WEST); pack();
this.setResizable(false);
this.setLocation(300, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} // 按钮的添加方法
public void addButton(JPanel p, String name, ActionListener action, Color c) {
JButton btn = new JButton(name);
p.add(btn);
btn.setForeground(c);
btn.addActionListener(action);
} public void addButton(JPanel p, String name, ActionListener action) {
JButton btn = new JButton(name);
p.add(btn);
btn.addActionListener(action);
} public void getResult(double x) {
if (oper.equals("+")) {
result += x;
} else if (oper.equals("-"))
result -= x;
else if (oper.equals("*"))
result *= x;
else if (oper.equals("/"))
result /= x;
else if (oper.equals("="))
result = x;
else if (oper.equals("s"))
result = Math.sqrt(x);
jtf.setText(df.format(result));
} class num implements ActionListener { public void actionPerformed(ActionEvent evt) {
String str = evt.getActionCommand();
if (IfResult) {
jtf.setText("");
IfResult = false; } jtf.setText(jtf.getText().trim() + str);
if (jtf.getText().equals("0")) {
jtf.setText("0");
IfResult = true;
flag = true;
}
} } class signs implements ActionListener { public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
if (command.equals("sqrt")) {
double i = Double.parseDouble(jtf.getText());
if (i >= 0) {
jtf.setText(String.valueOf(df.format(Math.sqrt(i))));
} else
jtf.setText("负数不能开平根!!");
} else if (command.equals("1/x")) {
if (Double.parseDouble(jtf.getText()) == 0) {
jtf.setText("除数不能为零");
} else
jtf.setText(df.format((1 / Double.parseDouble(jtf.getText()
.trim()))));
} else if (command.equals("%")) {
jtf
.setText(df.format(Double.parseDouble(jtf.getText()
.trim()) / 100));
} else {
// 测试点
if (flag)
IfResult = false;
if (IfResult) {
oper = command;
} else {
getResult(Double.parseDouble(jtf.getText()));
oper = command;
IfResult = true;
}
}
}
} // 清除的一些按钮类监听对象。
class clear implements ActionListener {
public void actionPerformed(ActionEvent arg0) {
String getaction = arg0.getActionCommand();
if (getaction.equals("C")) {
jtf.setText("0");
result = 0;
IfResult = true;
} else if (getaction.equals("-/+")) {
double i = 0 - Double.parseDouble(jtf.getText().trim());
jtf.setText(df.format(i)); } else if (getaction.equals("Blackspace")) {
// 测试点
if (Double.parseDouble(jtf.getText()) > 0
|| jtf.getText().charAt(0) == '负') {
if (jtf.getText().length() > 1) {
jtf.setText(jtf.getText().substring(0,
jtf.getText().length() - 1));
} else {
IfResult = true;
jtf.setText("0");
}
} else {
if (jtf.getText().length() > 2
|| jtf.getText().charAt(0) == '负') {
jtf.setText(jtf.getText().substring(0,
jtf.getText().length() - 1));
} else {
IfResult = true;
jtf.setText("0");
}
}
}
}
} // 内部类
class dot implements ActionListener { public void actionPerformed(ActionEvent evt) {
IfResult = false;
if (jtf.getText().trim().indexOf(".") == -1)
jtf.setText(jtf.getText() + "."); }
} public static void main(String[] args) throws Exception {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
new Calculator("Java版计算器").setVisible(true); }}

Answer 2

我这里有那些程序的源代码还有生成好的文件。你需要的话留下邮箱我发给你。或者你去这个地址下载去，这个也是我上传的 http://download.csdn.net/source/2174840