如下的ATM机程序中，怎样让一个界面打开的同时前一个界面消失，还有设置一个初始金额，并且可以一直调用。

额，我刚开始学，可能写的有点繁琐，请各位大神多担待点，帮忙看看。。。

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class yin {
public static void main(String[] args) {
final String userName = "1";
final String passwrod = "1";
JFrame jFrame = new JFrame("登陆界面");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 140);
jFrame.setResizable(false);
jFrame.setLayout(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel label1 = new JLabel("账 号");
label1.setBounds(10, 10, 100, 30);
jFrame.add(label1);
JLabel label2 = new JLabel("密 码");
label2.setBounds(10, 40, 100, 30);
jFrame.add(label2);
final JTextField text1 = new JTextField();
text1.setBounds(50, 15, 130, 20);
jFrame.add(text1);
final JPasswordField text2 = new JPasswordField();
text2.setBounds(50, 45, 130, 20);
jFrame.add(text2);
JButton button1 = new JButton("确 认");
button1.setBounds(100, 70, 85, 30);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(userName.equals(text1.getText()) && passwrod.equals(text2.getText())) {
xuan();
}
}
});
JButton button2 = new JButton("退 出");
button2.setBounds(10, 70, 85, 30);
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
jFrame.add(button1);
jFrame.add(button2);
jFrame.setVisible(true);
}
public static void xuan(){
JFrame jFrame = new JFrame("我的银行");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 140);
jFrame.setResizable(false);
jFrame.setLayout(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("存 款");
button1.setBounds(10, 10, 170, 25);
JButton button2 = new JButton("取 款");
button2.setBounds(10, 40, 170, 25);
JButton button3 = new JButton("退 出");
button3.setBounds(10, 70, 170, 25);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cunkuan();
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
qukuan();
}
});
button3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
jFrame.add(button1);
jFrame.add(button2);
jFrame.add(button3);
jFrame.setVisible(true);
}
public static void cunkuan(){
JFrame jFrame = new JFrame("我的银行");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 140);
jFrame.setResizable(false);
jFrame.setLayout(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("100");
button1.setBounds(0, 0, 70, 30);
JButton button2 = new JButton("500");
button2.setBounds(0, 40, 70, 30);
JButton button3 = new JButton("1000");
button3.setBounds(0, 80, 70, 30);
JButton button4 = new JButton("2000");
button4.setBounds(130, 0, 70, 30);
JButton button5 = new JButton("5000");
button5.setBounds(130, 40, 70, 30);
JButton button6 = new JButton("其他");
button6.setBounds(130, 80, 70, 30);
JButton button7 = new JButton("返回");
button7.setBounds(70, 80, 60, 30);
JLabel label1 = new JLabel("请 选 择");
label1.setBounds(70, 0, 70, 40);
jFrame.add(label1);
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()+100;
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()+500;
}
});
button3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()+1000;
}
});
button4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()+2000;
}
});
button5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()+5000;
}
});
button6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-5000;
}
});
button7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
xuan();
}
});
jFrame.add(button1);
jFrame.add(button2);
jFrame.add(button3);
jFrame.add(button4);
jFrame.add(button5);
jFrame.add(button6);
jFrame.add(button7);
jFrame.setVisible(true);
}
public static void qukuan (){
JFrame jFrame = new JFrame("我的银行");
Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 200, 140);
jFrame.setResizable(false);
jFrame.setLayout(null);
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("100");
button1.setBounds(0, 0, 70, 30);
JButton button2 = new JButton("500");
button2.setBounds(0, 40, 70, 30);
JButton button3 = new JButton("1000");
button3.setBounds(0, 80, 70, 30);
JButton button4 = new JButton("2000");
button4.setBounds(130, 0, 70, 30);
JButton button5 = new JButton("5000");
button5.setBounds(130, 40, 70, 30);
JButton button6 = new JButton("其他");
button6.setBounds(130, 80, 70, 30);
JButton button7 = new JButton("返回");
button7.setBounds(70, 80, 60, 30);
JLabel label1 = new JLabel("请 选 择");
label1.setBounds(70, 0, 70, 40);
jFrame.add(label1);
button1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {
int qian = qian()-100;
}
});
button2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-500;
}
});
button3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-1000;
}
});
button4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-2000;
}
});
button5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-5000;
}
});
button6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int qian = qian()-5000;
}
});
button7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
xuan();
}
});
jFrame.add(button1);
jFrame.add(button2);
jFrame.add(button3);
jFrame.add(button4);
jFrame.add(button5);
jFrame.add(button6);
jFrame.add(button7);
jFrame.setVisible(true);
}
public static int qian(){
int qian=100000000;
return qian;
}
}

没人么。。。。好吧。。。我先去吃个饭。。从早上写到现在了，饿死我了快。