可否给出一个java基础项目一试？

littlev19 2005-10-29 03:05:14

能不能给JAVA刚学不久的一个小项目？经典一些的好。
可否给出一个java基础项目一试？

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yy80680169 2005-11-10

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虽然简单了点

/*******************************************************************************
* 项目：计算器语言：Java 工具：JCreator 作者: QQ403170387 时间：2005.10.10
******************************************************************************/

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

/* 类Calculator为主类实现main方法 */
class Calculator extends JFrame
{
public Calculator()
{
super("计算器");
setSize(300, 240);
Container contentPane = getContentPane();
contentPane.add(new CalculatorPanel());
}

public static void main(String[] args)
{
Calculator cal = new Calculator();
cal.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
cal.setVisible(true);
}
}
//---------------------------------

class CalculatorPanel extends JPanel
{

private static boolean descv = true;

private static String d;

private static double a, b, c;
private static boolean isfir=true;

private JLabel displayLabel = new JLabel("0");

private JPanel northPanel = new JPanel();

private JPanel centerPanel = new JPanel();

private JButton backButton= new JButton("BackSpace");

public CalculatorPanel() {

setLayout(new BorderLayout());
add(northPanel, BorderLayout.NORTH);
add(centerPanel);

northPanel.setLayout(new BorderLayout());
northPanel.add(displayLabel);
northPanel.add(backButton, BorderLayout.EAST);
centerPanel.setLayout(new GridLayout(4, 4, 3, 3));

InsertAction in = new InsertAction();
CommandAction co = new CommandAction();
backButton.addActionListener(in);

final String s[] = { "7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3",
"-", "0", ".", "=", "+" };
final ActionListener[] a = { in, in, in, co, in, in, in, co, in, in, in, co,
in, in, co, co };
for (int count = 0; count < a.length; count++)
addButton(s[count], a[count]);

}

private void addButton(String lable, ActionListener listener)
{
JButton button = new JButton(lable);
button.addActionListener(listener);
centerPanel.add(button);
}

private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
String str = e.getActionCommand();
String a = displayLabel.getText().trim();

if (str.equals("BackSpace"))
{
String aa = a.substring(0,a.length()-1);

displayLabel.setText(aa);
if (aa.indexOf('.') != -1)
descv = false;
else
descv = true;
}
else if (str.equals("."))
{

if (a.equals("0"))
{
displayLabel.setText("0.");
descv = false;
}
else if (descv == true)
{
displayLabel.setText(displayLabel.getText() + ".");
descv = false;
}

} else if (a.equals("0")) {
displayLabel.setText(str);
} else {
displayLabel.setText(displayLabel.getText() + str);
}
}

}

private class CommandAction implements ActionListener
{
boolean booladd = true, booldele = true, boolmult = true,
booldivi = true;
boolean[] bool = { booladd, booldele, boolmult, booldivi };

public void actionPerformed(ActionEvent e)
{

String[] s1 = { "+", "-", "*", "/" };

Add add = new Add();
Dele dele = new Dele();
Mult mult = new Mult();
Divi divi = new Divi();
Calculate[] calculate = { add, dele, mult, divi };

for (int count = 0; count < s1.length; count++)
{

if (e.getActionCommand().equals(s1[count]))
{
isfir=true;
d = e.getActionCommand();
a = Double.parseDouble(displayLabel.getText());
displayLabel.setText("");

if (displayLabel.getText().indexOf('.') != -1)
descv = false;
else
descv = true;
}

if (e.getActionCommand().equals("=") && s1[count].equals(d))
{
if ( isfir == true)
{
b = Double.parseDouble(displayLabel.getText().trim());
isfir=false;
}
if (bool[count] == true)
{
c = calculate[count].calc(a, b);
bool[count] = false;
} else {
c = calculate[count].calc(c, b);
}

if ((int) c == c)
displayLabel.setText("" + (int) c);
else
displayLabel.setText("" + c);
}
}

if (displayLabel.getText().indexOf('.') != -1)
descv = false;
else
descv = true;

}
}
}

abstract class Calculate {
abstract double calc(double d1, double d2);
}

class Add extends Calculate {
double calc(double d1, double d2) {
return d1 + d2;
}
}

class Dele extends Calculate {
double calc(double d1, double d2) {
return d1 - d2;
}
}

class Mult extends Calculate {
double calc(double d1, double d2) {
return d1 * d2;
}
}

class Divi extends Calculate {
double calc(double d1, double d2) {
return d1 / d2;
}
}
//来自QQ：403170387的空间（QQ-ZONE）

littlev19 2005-11-10