package com.deitel.jhtp3.ch17;//創建一個包import java.awt.*;import javax.swing.*;public class BankUI extends JPanel {	protected final static String names[] = {"Account number",    "Frist name", "Last name", "Balance",    "Transaction Amount"};//定義一個靜態的final字符串數組    protected JLabel labels[];//聲明一個JLable對象的引用    protected JTextField fields[];//聲明一個JTextField對象的引用    protected JButton doTask, doTask2;//聲明兩個JButton的引用    protected JPanel innerPanelCenter, innerPanelSouth;//申明兩個JPanel面板    protected int size = 4;    public static final int ACCOUNT = 0, FIRST = 1,    LAST = 2, BALANCE = 3, TRANSCTION = 4;//定義幾個靜態的final變量    public BankUI() {//構造函數    	this (4);    }    public BankUI(int mySize) {//帶參數的構造方法    	size = mySize;    	labels = new JLabel[size];//把聲明一個JLable對象的引用    	fields = new JTextField[size];//同上    	    	for(int i = 0; i < labels.length; i++) {    		labels[i] = new JLabel(names[i]);//給引用賦值    	}    	for(int i = 0; i <  fields.length; i++) {    		fields[i] = new JTextField();//給引用賦值    	}    	innerPanelCenter = new JPanel();//給申明的引用賦值    	innerPanelCenter.setLayout(new GridLayout(size, 2));//設置布局管理器    	    	for(int i = 0; i< size; i++) {    		innerPanelCenter.add(labels[i]);    		innerPanelCenter.add(fields[i]);      	}      	doTask = new JButton();      	doTask2 = new JButton();      	innerPanelSouth = new JPanel();      	innerPanelSouth.add(doTask2);      	innerPanelSouth.add(doTask);      	      	setLayout(new BorderLayout());      	add(innerPanelCenter, BorderLayout.CENTER);      	add(innerPanelSouth, BorderLayout.SOUTH);      	validate();    }        public JButton getDoTask() {    	return doTask;    }        public JButton getDoTask2() {    	return doTask2;    }        public JTextField[] getFields() {    	return fields;    }        public void clearField() {    	for(int i = 0; i < size; i++) {    		fields[i].setText("");    	}    }        public void setFieldValues(String[] s)                 throws IllegalArgumentException {        if(s.length != size) {        	throw new IllegalArgumentException ("There must be"        	+ size + "String in the array");        	        }        for(int i = 0; i < size; i++) {        	fields[i].setText(s[i]);        }    }        public String[] getFieldValues() {    	String values[] = new String[size];    	    	for(int i = 0; i < size; i++) {    		values[i] = fields[i].getText();    	}    	return values;    }}