java编写银行卡:包含属性卡号,密码和余额,要求卡号不能修改,密码修改需要提供？

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思路：可以新建一个银行卡类BankCard，内部属性包含一个私有的不可变常量卡号cardNo，私有的可变量密码password，私有的可变量余额cardBalance。

参考代码如下：（仅供参考）

Java运行一串代码后把电脑卡死了，代码没错，运行出一次后就再也没用了，只要一运行这个代码就卡

代码与你的电脑系统不兼容。

建议你用PHP的来做。

win7 64位。

关于那个黄金卡的JAVA代码 可以告诉我做吗

import javax.swing.JOptionPane;

/**

*

* @author __USER__

*/

public class test extends javax.swing.JFrame {

/** Creates new form test */

public test() {

initComponents();

}

//GEN-BEGIN:initComponents

// editor-fold defaultstate="collapsed" desc="Generated Code"

private void initComponents() {

jButton1 = new javax.swing.JButton();

jLabel1 = new javax.swing.JLabel();

jTextField1 = new javax.swing.JTextField();

jTextField2 = new javax.swing.JTextField();

jLabel2 = new javax.swing.JLabel();

jTextField3 = new javax.swing.JTextField();

jLabel3 = new javax.swing.JLabel();

jLabel4 = new javax.swing.JLabel();

jTextField4 = new javax.swing.JTextField();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jButton1.setText("\u5f00\u59cb\u6d4b\u8bd5");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

jLabel1.setText("\u8bf7\u8f93\u5165\u6d4b\u8bd5\u6b21\u6570\uff1a");

jTextField2.setEditable(false);

jLabel2.setText("\u6362\u5361\u80dc\u5229\u6b21\u6570\uff1a");

jTextField3.setEditable(false);

jLabel3.setText("\u4e0d\u6362\u80dc\u5229\u6b21\u6570\uff1a");

jLabel4.setText("\u603b\u8017\u65f6\uff08\u79d2\uff09\uff1a");

jTextField4.setEditable(false);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(

getContentPane());

getContentPane().setLayout(layout);

layout

.setHorizontalGroup(layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

layout

.createSequentialGroup()

.addGap(84, 84, 84)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

layout

.createSequentialGroup()

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

layout

.createSequentialGroup()

.addComponent(

jLabel3)

.addGap(

26,

26,

26)

.addComponent(

jTextField3,

javax.swing.GroupLayout.DEFAULT_SIZE,

153,

Short.MAX_VALUE))

.addGroup(

layout

.createSequentialGroup()

.addComponent(

jLabel2)

.addGap(

26,

26,

26)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(

jTextField4,

javax.swing.GroupLayout.PREFERRED_SIZE,

97,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(

jTextField2,

javax.swing.GroupLayout.DEFAULT_SIZE,

153,

Short.MAX_VALUE))))

.addGap(

119,

119,

119))

.addGroup(

layout

.createSequentialGroup()

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.TRAILING)

.addComponent(

jLabel4)

.addComponent(

jLabel1))

.addPreferredGap(

javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addComponent(

jTextField1,

javax.swing.GroupLayout.PREFERRED_SIZE,

117,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(

18,

18,

18)

.addComponent(

jButton1)

.addContainerGap()))));

layout

.setVerticalGroup(layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(

javax.swing.GroupLayout.Alignment.TRAILING,

layout

.createSequentialGroup()

.addGap(52, 52, 52)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(jLabel4)

.addComponent(

jTextField4,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(28, 28, 28)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(

jLabel2,

javax.swing.GroupLayout.PREFERRED_SIZE,

20,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(

jTextField2,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(32, 32, 32)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(

jLabel3,

javax.swing.GroupLayout.PREFERRED_SIZE,

20,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(

jTextField3,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE))

.addPreferredGap(

javax.swing.LayoutStyle.ComponentPlacement.RELATED,

67, Short.MAX_VALUE)

.addGroup(

layout

.createParallelGroup(

javax.swing.GroupLayout.Alignment.BASELINE)

.addComponent(

jLabel1,

javax.swing.GroupLayout.PREFERRED_SIZE,

20,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(

jTextField1,

javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.PREFERRED_SIZE)

.addComponent(jButton1))

.addGap(76, 76, 76)));

pack();

}// /editor-fold

//GEN-END:initComponents

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

long time = System.currentTimeMillis();

String number = jTextField1.getText();

if (number.matches("^[1-9]{1}\\d*$")) {

long count1 = 0;

long count2 = 0;

int[] cards = { 0, 0, 1 };

long times = Long.parseLong(number);

for (long i = 0L; i times; i++) {

int random = (int) (Math.random() * 3);

//表示第一次抽取的牌

int card1 = cards[random];

count1 += card1;

//表示第二次如果换牌之后的牌

int card2 = Math.abs(card1 - 1);

count2 += card2;

}

time = System.currentTimeMillis() - time;

jTextField2.setText("" + count2);

jTextField3.setText("" + count1);

jTextField4.setText("" + time/1000.0);

} else {

JOptionPane.showMessageDialog(null, "输入有误！");

}

}

/**

* @param args

* the command line arguments

*/

public static void main(String args[]) {

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new test().setVisible(true);

}

});

}

//GEN-BEGIN:variables

// Variables declaration - do not modify

private javax.swing.JButton jButton1;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JLabel jLabel4;

private javax.swing.JTextField jTextField1;

private javax.swing.JTextField jTextField2;

private javax.swing.JTextField jTextField3;

private javax.swing.JTextField jTextField4;

// End of variables declaration//GEN-END:variables

}

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