显示一个输入的三位整数的各位数字&一个Person类

帮同学写了一个公选课要交的作业：

题目1、显示一个三位整数的各位数字

输入一个整数，分别显示其百位、十位和个位数字，图形用户界面如图所示。要求：整数文本框可编辑，其他文本框仅用于显示不可编辑；整数文本框响应文本编辑事件；当输入数据错误时，处理异常，弹出对话框，提示重新输入信息。

题目2、定义一个父类Person，属性包含姓名、地址、城市、国家、邮编，方法包括构造方法、分别设置各个属性、分别返回各个属性、显示所有属性。Person子类有两个：学生类和教师类。

学生类自己的属性包括主修专业、学号、年级、成绩（成绩每名同学包括3门成绩），增加的方法包括设置和返回增加的属性，显示方法以及构造方法，

教师类自己的属性包括部门、收入，增加的方法包括设置和返回增加的属性，显示方法以及构造方法。

 

其中第一个可以运行，毕竟硬指标在这里检验，但是写的第二个就不知道符合要求了不，只是尽量这么写。

 

两题代码如下：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
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.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;

public class DisplayTest extends JFrame implements ActionListener {

	public static final int WIDTH = 240;
	public static final int HEIGHT = 195;
	public static final int COLUMN=25;

	private Container container;
	private JTextField infTF;
	private JPanel panelD;//输入数字所在面板
	private JPanel panelB;//百位数所在面板
	private JPanel panelS;//十位数所在面板
	private JPanel panelG;//个位数所在面板
	private JPanel panel;
	private JLabel labelD;
	private JLabel labelB;
	private JLabel labelS;
	private JLabel labelG;
	private JTextField tfD;// 输入数字的文本框
	private JTextField tfB;// 百位数的文本框
	private JTextField tfS;
	private JTextField tfG;
	private JButton button_ok;
	private JButton button_quit;

	public DisplayTest() {
		super("三位数显示");
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			// 把外观设置成所使用的平台的外观,即这个程序在哪个平台运行,显示的窗口,对话框外观将是哪个平台的外观.
		} catch (Exception e) {
		}
		setSize(WIDTH, HEIGHT);
		this.setBackground(Color.lightGray);
		infTF = new JTextField("@SCUEC  计科院09自动化  *** ");
		infTF.setEditable(false);
		container = getContentPane();
		
		panelD=new JPanel();
		panelB=new JPanel();
		panelS=new JPanel();
		panelG=new JPanel();
		panel=new JPanel();

		labelD = new JLabel("整数");
		labelB = new JLabel("百位");
		labelS = new JLabel("十位");
		labelG = new JLabel("个位");
		
		tfD = new JTextField(COLUMN);
		tfB = new JTextField(COLUMN);
		tfB.setEditable(false);
		tfS = new JTextField(COLUMN);
		tfS.setEditable(false);
		tfG = new JTextField(COLUMN);
		tfG.setEditable(false);

		button_ok=new JButton("确定");
		button_ok.addActionListener(this);
		button_quit=new JButton("退出");
		button_quit.addActionListener(this);
		
		setLayout(new GridLayout(6, 1));
		
		panelD.add(labelD);
		panelD.add(tfD);
		panelB.add(labelB);
		panelB.add(tfB);
		panelS.add(labelS);
		panelS.add(tfS);
		panelG.add(labelG);
		panelG.add(tfG);
		panel.add(button_ok);
		panel.add(button_quit);
		
		container.add(panelD);
		container.add(panelB);
		container.add(panelS);
		container.add(panelG);
		container.add(panel);
		container.add(infTF, BorderLayout.SOUTH);
		
		Dimension frameSize = getSize();
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		setLocation((screenSize.width - frameSize.width) / 2,
				(screenSize.height - frameSize.height) / 2);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
	
	@Override
	public void actionPerformed(ActionEvent event) {

		if(event.getSource()==button_ok){
			try{
				int i = Integer.parseInt(tfD.getText());
				if(i>999||i<100){
					JOptionPane.showMessageDialog(container, "输入错误，请重新输入一个三位数");
					tfD.setText("");
				}else{
					tfB.setText("" + (i /100));
					tfS.setText("" + (i /10 % 10));
					tfG.setText("" + i % 10);
				}
			}catch(NumberFormatException e){
				JOptionPane.showMessageDialog(this,"\""+tfD.getText()+"\" 不能转换成整数，请重新输入!");
				tfD.setText("");
			}
		}
		
		if(event.getSource()==button_quit){
			System.exit(0);
		}
	}

	public static void main(String[] args) {
		new DisplayTest();
	}
}

效果如图：

 

public class PersonTest {
	public static void main(String[] args) {
		Person[] people = new Person[2];
		people[0] = new Teacher("Yanghai", "minyuanroad 708#", "Wuhan",
				"China", 430074, "Science Computer", 100000);
		people[1] = new Student("Lirentian", "minyuanroad 708#", "Wuhan",
				"China", 430074, "automic", "09064047", 2009, 90, 89, 91);

		for (Person p : people)
			System.out.println(p.getName() + ", " + p.getDescription()
					+ p.getCity() + "," + p.getCountry() + "," + p.getCode());
	}
}

abstract class Person {
	public Person(String aName, String aAddress, String aCity, String aCountry,
			int aCode) {
		name = aName;
		address = aAddress;
		city = aCity;
		country = aCountry;
		code = aCode;
	}

	public abstract String getDescription();

	public String getName() {
		return name;
	}

	public String getAddress() {
		return address;
	}

	public String getCity() {
		return city;
	}

	public String getCountry() {
		return country;
	}

	public int getCode() {
		return code;
	}

	private String name;
	private String address;
	private String city;
	private String country;
	private int code;
}

class Teacher extends Person {
	public Teacher(String n, String ad, String city, String country, int code,
			String dep, double s) {
		super(n, ad, city, country, code);
		department = dep;
		salary = s;
	}

	public double getSalary() {
		return salary;
	}

	public String getDepartment() {
		return department;
	}

	public String getDescription() {
		return String.format("an employee with a salary of $%.2f", salary)
				+ " at " + department + " department,SCUEC ";
	}

	public void raiseSalary(double byPercent) {
		double raise = salary * byPercent / 100;
		salary += raise;
	}

	private double salary;
	private String department;
}

class Student extends Person {
	public Student(String n, String ad, String city, String country, int code,
			String m, String num, int g, int s1, int s2, int s3) {
		// pass n to superclass constructor
		super(n, ad, city, country, code);
		major = m;
		number = num;
		grade = g;
		score1 = s1;
		score2 = s2;
		score3 = s3;
	}

	public String getDescription() {
		return "a student majoring in " + major + "," + "he is at grade "
				+ grade + ",and his number is " + number
				+ ", his three course's score:" + "\"" + score1 + ", " + score2
				+ ", " + score3 + "\"" + "\n" + " at SCUEC,";
	}

	private String major;
	private String number;
	private int grade;
	private int score1, score2, score3;
}