girdlayout.java

java 银行系统 初级水平 可用于走投无路时的参考

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

public class Girdlayout extends JFrame{
Label t,x1,x2;
double result,h;
Button b1,b2,b3,b4,b5;
Button b11,b22,b33,b44,b55;
Button y1;
TextField txt1,txt2,txt3,txt4;
Saving m1;
Withdraw m2;
Search m3;
Changmima m4;
String a,b;
Frame d;
public Girdlayout(){



result=0.0;
m1=new Saving(); 
m2=new Withdraw();
m3=new Search();
m4=new Changmima();
setSize(300,300);
setTitle("登录成功");
GridBagLayout gridbag=new GridBagLayout();

setLayout(gridbag);

GridBagConstraints c=new GridBagConstraints();
c.fill=GridBagConstraints.BOTH;

c.weighty=0.5;

t=new Label("请选择你要进行的操作:",Label.CENTER);
c.gridwidth=GridBagConstraints.REMAINDER;
gridbag.setConstraints(t,c);
add(t);
c.weightx=0.5;
c.weighty=0;


c.gridwidth=2;
b1=new Button("存款");
gridbag.setConstraints(b1,c);
  a=new String();
  txt1=new TextField(8);
  txt1.setBounds(new Rectangle(115,59,180,33));
  m1.add(txt1);
b1.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              
              b11=new Button("确定");
             b11.setBounds(new Rectangle(78,220,86,30));
             b11.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
                 a=txt1.getText();       
              result+=Double.parseDouble(a);
              txt1.setText("");
               m1.dispose(); }});
              m1.add(b11);
b22=new Button("取消");
b22.setBounds(new Rectangle(193,220,86,30));
b22.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
             txt1.setText("");}});
m1.add(b22);
m1.show();
}}); 
add(b1);



d=new Frame();
d.setSize(400,300);
d.setTitle("取款失败");
y1=new Button("确定");

y1.setBounds(new Rectangle(78,220,86,30));
x1=new Label("你的取款额大于你的余款额!");
x1.setBounds(new Rectangle(45,58,167,33));
x2=new Label("你的余款额:");
x2.setBounds(new Rectangle(45,105,167,33));
d.setLayout(null);
txt4=new TextField(8);
txt4.setEditable(false);
txt4.setBounds(new Rectangle(45,150,180,33));
y1.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              d.dispose();}});
d.add(y1);
d.add(x1);
d.add(x2);
d.add(txt4);




c.gridheight=2;
b2=new Button("取款");
gridbag.setConstraints(b2,c);
txt2=new TextField(8);
txt2.setBounds(new Rectangle(115,59,180,33));
m2.add(txt2);
 b=new String();
b2.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
       b44=new Button("确定");
b44.setBounds(new Rectangle(78,220,86,30));
b44.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              b=txt2.getText();       
              h=Double.parseDouble(b);
               if(h<=result){
              txt2.setText("");
              result=result-h;
             m2.dispose();}
             else{txt2.setText("");txt4.setText(""+result);d.show();
                m2.dispose();}
}});
m2.add(b44);
b55=new Button("取消");
b55.setBounds(new Rectangle(193,220,86,30));
b55.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              txt2.setText("");}});
             m2.add(b55);
            m2.show();}});
add(b2);



c.gridheight=3;
b3=new Button("查询余额");
gridbag.setConstraints(b3,c);
txt3=new TextField();
txt3.setEditable(false);
txt3.setBounds(new Rectangle(115,59,180,33));

m3.add(txt3);
b3.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
txt3.setText(""+result);
b33=new Button("退出");
b33.setBounds(new Rectangle(78,220,86,30));
b33.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              m3.dispose();}});
              m3.add(b33);
             m3.show();}});
add(b3);



c.gridheight=4;
b4=new Button("修改密码");
gridbag.setConstraints(b4,c);
b4.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              m4.show();}});
add(b4);


c.gridwidth=GridBagConstraints.REMAINDER;
b5=new Button("退出");
gridbag.setConstraints(b5,c);
b5.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent e){
              dispose();}});
add(b5);








}




}