要用变量与常量，运算符，分支结构，循环结构，方法，数组，类和对象做一个类似于登录窗口一样的程序

Question

 要用变量与常量，运算符，分支结构，循环结构，方法，数组，类和对象做一个类似于登录窗口一样的程序

Answer 1

package T9;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Register extends JFrame{

	JPanel panelCenter,panelSouth;
	JLabel lblTitle;
	JButton btnReg,btnClose;
	
	JLabel lblusername,lblpassword,lblcfgpwd,lblage,lblsex,lblcardno;
	JLabel lblnation,lblhobit,lblRemark;
	
	//文本框
	JTextField txtUserName,txtAge,txtCardno;
	//密码框
	JPasswordField txtpwd,txtcfgpwd;
	//单选框
	JRadioButton rbmale,rbremale;
	//下拉列表框
	JComboBox cbNation;
	//多选框
	JCheckBox cbBasketball,cbFootball,cbsing,cbNet,cbDance,cbBook,cbGame;
	//文本区域框
	JTextArea txtRemark;
	//单选分组按钮
	ButtonGroup bgsex;
	
	public Register() {
		super("用户注册");
		
		/**
		 * 设置界面风格
		 * 1.windows操作系统的风格;
		 * 2.Solaris操作系统的风格;
		 * 3.Mac apple操作系统的风格;
		 * 
		 * */
		
		try {
			UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
//			UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
//			UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
			
		} catch (Exception e) {
			e.printStackTrace();
		} 
//		setTitle("用户注册");
		lblTitle = new JLabel("用户注册",JLabel.CENTER);
		lblTitle.setBackground(Color.RED);
		//设置字体，黑体，粗体，32号字
		lblTitle.setFont(new Font("黑体",Font.BOLD,32));
		lblTitle.setForeground(Color.RED);
		//绝对布局(坐标)
		panelCenter = new JPanel(null);
		//流布局，居中对齐
		panelSouth = new JPanel(new FlowLayout(FlowLayout.CENTER));
		panelSouth.setBackground(Color.PINK);
		panelCenter.setBackground(Color.CYAN);
		add(lblTitle,BorderLayout.NORTH);
		add(panelCenter);
		add(panelSouth,BorderLayout.SOUTH);
		btnReg = new JButton("注册(R)");
		btnClose = new JButton("关闭(X)");
		//设置热键ALT键+字母
		btnReg.setMnemonic('R');
		btnClose.setMnemonic('X');
		panelSouth.add(btnReg);
		panelSouth.add(btnClose);
		
		
		lblusername = new JLabel("用户名称：",JLabel.RIGHT);
		lblusername.setBounds(100, 30, 100, 30);
		txtUserName = new JTextField();
		txtUserName.setBounds(200, 30, 200, 30);
		panelCenter.add(lblusername);
		panelCenter.add(txtUserName);
		
		lblpassword = new JLabel("登录密码：",JLabel.RIGHT);
		lblpassword.setBounds(100, 70, 100, 30);
		txtpwd = new JPasswordField();
		txtpwd.setBounds(200, 70, 200, 30);
		panelCenter.add(lblpassword);
		panelCenter.add(txtpwd);
		
		lblcfgpwd = new JLabel("确认密码：",JLabel.RIGHT);
		lblcfgpwd.setBounds(100, 110, 100, 30);
		txtcfgpwd = new JPasswordField();
		txtcfgpwd.setBounds(200, 110, 200, 30);
		panelCenter.add(lblcfgpwd);
		panelCenter.add(txtcfgpwd);
		
		
		lblage = new JLabel("年龄：",JLabel.RIGHT);
		lblage.setBounds(100, 150, 100, 30);
		txtAge = new JTextField();
		txtAge.setBounds(200, 150, 200, 30);
		panelCenter.add(lblage);
		panelCenter.add(txtAge);

		
		lblsex = new JLabel("性别：",JLabel.RIGHT);
		lblsex.setBounds(100, 190, 100, 30);
		rbmale = new JRadioButton("男");
		//默认选中
		rbmale.setSelected(true);
		rbmale.setBounds(200, 190, 50, 30);
		rbremale = new JRadioButton("女");
		rbremale.setBounds(250, 190, 50, 30);
		bgsex = new ButtonGroup();
		bgsex.add(rbmale);
		bgsex.add(rbremale);
		
		
		panelCenter.add(lblsex);
		panelCenter.add(rbmale);
		panelCenter.add(rbremale);
		
		
		lblcardno = new JLabel("身份证号码：",JLabel.RIGHT);
		lblcardno.setBounds(100, 230, 100, 30);
		txtCardno = new JTextField();
		txtCardno.setBounds(200, 230, 200, 30);
		panelCenter.add(lblcardno);
		panelCenter.add(txtCardno);
		
		lblnation = new JLabel("民族：",JLabel.RIGHT);
		lblnation.setBounds(100, 270, 100, 30);
		String[] snation = {"汉族","壮族","苗族","侗族","朝鲜族","高山族","维吾尔族","其他民族"};
		cbNation = new JComboBox(snation);
		cbNation.setBounds(200, 270, 200, 30);
		panelCenter.add(lblnation);
		panelCenter.add(cbNation);

		
		
		lblhobit = new JLabel("兴趣爱好：",JLabel.RIGHT);
		lblhobit.setBounds(100, 310, 100, 30);
		cbBasketball = new JCheckBox("篮球");
		cbFootball = new JCheckBox("足球");
		cbsing = new JCheckBox("唱歌");
		cbNet = new JCheckBox("上网");
		cbDance = new JCheckBox("跳舞");
		cbBook = new JCheckBox("看书");
		cbGame = new JCheckBox("游戏");
		cbBasketball.setBounds(200, 310, 60, 30);
		cbFootball.setBounds(260, 310, 60, 30);
		cbsing.setBounds(320, 310, 60, 30);
		cbNet.setBounds(380, 310, 60, 30);
		cbDance.setBounds(200, 350, 60, 30);
		cbBook.setBounds(260, 350, 60, 30);
		cbGame.setBounds(320, 350, 60, 30);
		panelCenter.add(lblhobit);
		panelCenter.add(cbBasketball);
		panelCenter.add(cbFootball);
		panelCenter.add(cbsing);
		panelCenter.add(cbNet);
		panelCenter.add(cbDance);
		panelCenter.add(cbBook);
		panelCenter.add(cbGame);

		
		lblRemark = new JLabel("个人说明：",JLabel.RIGHT);
		lblRemark.setBounds(100, 390, 100, 30);
		txtRemark = new JTextArea();
		txtRemark.setBounds(200, 390, 200, 80);
		//创建一个滚动面板
		JScrollPane jsp = new JScrollPane(txtRemark);
		jsp.setBounds(200, 390, 200, 80);
		panelCenter.add(lblRemark);
		panelCenter.add(jsp);
		
		ActionHandle handler = new ActionHandle();
		btnReg.addActionListener(handler);
		btnClose.addActionListener(handler);
		
		
		setSize(550, 600);
		setVisible(true);
		setLocationRelativeTo(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
	}
	public static void main(String[] args) {
		new Register();
	}
	class ActionHandle implements ActionListener{

		public void actionPerformed(ActionEvent e) {
			if(e.getSource()==btnReg){
				//用户名不能为空
				if(txtUserName.getText().equals("")){
					JOptionPane.showMessageDialog(null, "用户名不能为空");
					//获取焦点
					txtUserName.requestFocus();
					return;
				}
				//密码不能为空
				if(txtpwd.getText().equals("")){
					JOptionPane.showMessageDialog(null, "密码不能为空");
					txtpwd.requestFocus();
					return;
				}
				if(!txtpwd.getText().equals(txtcfgpwd.getText())){
					JOptionPane.showMessageDialog(null, "登录密码与确认密码不一致");
					txtcfgpwd.requestFocus();
					return;
				}
				if(txtAge.getText().equals("")){
					JOptionPane.showMessageDialog(null, "请输入年龄");
					txtAge.requestFocus();
					return;
				}
				int age=0;
				try{
					age = Integer.parseInt(txtAge.getText().trim());
				}catch(Exception ex){
					JOptionPane.showMessageDialog(null, "年龄必须在0~150之间的数字字符");
					txtAge.requestFocus();
					return;
				}
				if(age<0 || age>150){
					JOptionPane.showMessageDialog(null, "年龄必须在0~150之间的数字字符");
					txtAge.requestFocus();
					return;
				}
				if(txtCardno.getText().trim().length()!=18){
					JOptionPane.showMessageDialog(null, "身份证号码必须为18位");
					txtCardno.requestFocus();
					return;
					
				}
				JOptionPane.showMessageDialog(null, "恭喜你，注册成功！！！！");
			}else if(e.getSource()==btnClose) {
				System.exit(0);
			}
			
		}
		
	}
}