自考JAVA语言程序设计（一）课后习题答案和源代码（实验大纲）

1、实验大纲1 字符统计程序程序运行结果：统计字符源文件：StaChar.javaimport javax.swing.*;/* * 1 字符统计程序 * 利用对话框读入字符串 统计输入字符行中数字字符、英文字母个数. * author 黎明你好 */public class StaCharpublic static void main(String args)String str = JOptionPane.showInputDialog(请输入字符串：);char c = str.toCharArray();int numberCount = 0;int letterCount = 0;for

2、 (int i = 0; i c.length; i+)if (ci 0)numberCount+;else if (ci A & ci a & ci z)letterCount+;String result = 输入内容：n + str + n数字字符： + numberCount + 个； + n字母： + letterCount+ 个;JOptionPane.showMessageDialog(null, result, 结果：, JOptionPane.INFORMATION_MESSAGE);2 找质数程序程序运行结果：输出质数原文件：PrintPrime.javaimport ja

3、vax.swing.JOptionPane;/* * 2 找质数程序,利用对话框读入整数,输出2至这个整数之间的质数. * author 黎明你好 */public class PrintPrimeprivate int number;/ 正整数private String result = ;public PrintPrime()/ 构造方法number = getIntegerNumber(输入整数n, 0);/ 要求是=0的整数if (number 0)return;/ 出现错误，程序结束else/ 如果大于等于2，开始用循环计算结果for (int i = 2; i = number;

4、 i+) / 计算素数和if (isPrimeNumber(i)result += i + ;/ 显示最后的和JOptionPane.showMessageDialog(null, number + 之前所有素数为：n “ + result + ”, 显示结果,JOptionPane.INFORMATION_MESSAGE);/* * 通过图形界面，得到符合规则的正整数的方法 * param message - 在弹出的对话框中，显示提示信息 * param min - 要求此数必须大于等于min * return - 返回符合规则的整数 */public int getIntegerNumb

5、er(String message, int min)String str = JOptionPane.showInputDialog(null, message, 提示信息,JOptionPane.INFORMATION_MESSAGE);int number = -1;trynumber = Integer.parseInt(str); / 得到输入的正整数catch( Exception e )JOptionPane.showMessageDialog(null, 输入非数字字符n程序结束, 错误警告, JOptionPane.ERROR_MESSAGE);return -1; / 输入

6、的不是数字字符，程序结束if (number min)JOptionPane.showMessageDialog(null, 输入的数不符合规则，不是正整数n程序结束, 错误警告,JOptionPane.ERROR_MESSAGE);return -1; / 输入的数不是大于2的正整数时候，程序结束elsereturn number;/* * 判断是否是素数的方法 * param n - 需要判断的数 * return - 是素数返回true，否则返回false */public boolean isPrimeNumber(int n)for (int i = 2; i n; i+)if (n

7、 % i = 0)return false;return true;/* main方法 */public static void main(String args)new PrintPrime();3 类的继承定义，包括几何形状类Shape、圆形类Circle.、矩形类Rectangle/* * 几何图形类，抽象类 */abstract class Shapepublic float area()return 0.0f;/* * 圆形类 */class Circle extends Shapeprivate float R;public Circle(float r)R = r;public

8、float area()return (float) (Math.PI * R * R);/* * 矩形类 */class Rectangle extends Shapeprivate float w, h;public Rectangle(float w, float h)this.w = w;this.h = h;public float area()return w * h;public class Work11_3public static void main(String args)Circle c;Rectangle r;c = new Circle(2.0f);r = new R

9、ectangle(3.0f, 5.0f);System.out.println(圆面积 + returnArea(c);System.out.println(长方形面积 + returnArea(r);static float returnArea(Shape s)return s.area();4 数组排序程序源文件：Work11_4.javaimport javax.swing.*;import java.util.*;/* * 4 数组排序程序. * 输入整数序列,对输入的整数进行排序,输出结果. * author 黎明你好 */public class Work11_4public s

10、tatic final int RISE = 0;public static final int LOWER = 1;public static void main(String args)String str = JOptionPane.showInputDialog(请输入字符串：);StringTokenizer token = new StringTokenizer(str, ,.;: );int mode = Work11_4.RISE;/ 排列模式，默认为升序排列int count = token.countTokens();/ 输入的整数的个数int array = new in

11、tcount;int index = 0;while (token.hasMoreTokens()tryarrayindex = Integer.parseInt(token.nextToken();index+;catch( Exception e )JOptionPane.showMessageDialog(null, 输入非法字符, 错误警告, JOptionPane.ERROR_MESSAGE);return;/ 输入非法字符时候，直接结束程序sort(array, mode);/ 按mode模式，进行排序String result = new String();String mode

12、String = new String();if (mode = Work11_4.RISE)modeString = 升序排列结果为：;if (mode = Work11_4.LOWER)modeString = 降序排列结果为：;for (int i = 0; i array.length; i+)result = result + arrayi + ，;if (result != null)JOptionPane.showMessageDialog(null, result, modeString, JOptionPane.INFORMATION_MESSAGE);/* * 给数组排序的

13、方法 * param array - 需要排序的数组 * param mode - 排序的模式，可以为RISE，LOWER */public static void sort(int array, int mode)for (int i = 0; i array.length; i+)for (int j = 0; j arrayj + 1)int temp = arrayj;arrayj = arrayj + 1;arrayj + 1 = temp;if (mode = Work11_4.LOWER & arrayj arrayj + 1)int temp = arrayj;arrayj =

14、 arrayj + 1;arrayj + 1 = temp;5 字符串处理程序，括号匹配程序运行结果：括号匹配检测源文件：CheckBrackets.javaimport java.awt.*;import java.awt.event.*;import javax.swing.*;import unit9.MyFileFilter;import java.io.*;/* * 5 字符串处理程序. * 输入程序的源程序代码行,找出可能存在圆括号，花括号不匹配的错误. * author 黎明你好 */public class CheckBrackets extends JFrame implem

15、ents ActionListener, ItemListenerprivate static final long serialVersionUID = 1L;private JFileChooser fileChooser;private JButton openFileButton;private JComboBox comboBox;private JTextField showRowStringField;private JTextField showMessageField;private JTextArea textArea;private JPanel northPanel,

16、control_panel;private String rowString;private File file = null;public CheckBrackets()super(检测圆、花括号匹配程序);fileChooser = new JFileChooser(System.getProperty(user.dir);openFileButton = new JButton(打开文件);showRowStringField = new JTextField();showMessageField = new JTextField(20);textArea = new JTextArea

17、();comboBox = new JComboBox();northPanel = new JPanel();control_panel = new JPanel();rowString = new String1000;fileChooser.addChoosableFileFilter(new MyFileFilter(txt);/文件筛选textArea.setLineWrap(true);showRowStringField.setEditable(false);showRowStringField.setBackground(Color.WHITE);showMessageFiel

18、d.setEditable(false);showMessageField.setBackground(Color.WHITE);openFileButton.addActionListener(this);comboBox.addItemListener(this);comboBox.addItem(请选择);control_panel.add(openFileButton);control_panel.add(new JLabel( 选择代码行:);control_panel.add(comboBox);control_panel.add(new JLabel(检测结果:);control

19、_panel.add(showMessageField);northPanel.setLayout(new GridLayout(2, 1, 10, 10);northPanel.add(control_panel);northPanel.add(showRowStringField);this.add(northPanel, BorderLayout.NORTH);this.add(new JScrollPane(textArea), BorderLayout.CENTER);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);this.s

20、etBounds(50, 50, 550, 500);this.setVisible(true);this.validate();public void actionPerformed(ActionEvent e)showMessageField.setText();int message = fileChooser.showOpenDialog(this);if (message = JFileChooser.APPROVE_OPTION)file = fileChooser.getSelectedFile();comboBox.removeAllItems();comboBox.addIt

21、em(请选择);readFile(file);public void itemStateChanged(ItemEvent e)int index = comboBox.getSelectedIndex();if (index = 1)showRowStringField.setText(rowStringindex - 1);char c = rowStringindex - 1.toCharArray();int count1 = 0;int count2 = 0;for (int i = 0; i c.length; i+)if (ci = )count1+;if (ci = )coun

22、t1-;if (ci = ()count2+;if (ci = )count2-;System.out.println(大括号 + count1 + ,小括号： + count2);if (count1 != 0)showMessageField.setText(第 + index + 行，大括号匹配错误);else if (count2 != 0)showMessageField.setText(第 + index + 行，小括号()匹配错误);else if (count1 != 0 & count2 != 0)showMessageField.setText(第 + index + 行，

23、大、小括号都匹配错误);else if (count1 = 0 & count2 = 0)showMessageField.setText(括号匹配正确);public void readFile(File f)if (f != null)tryFileReader file = new FileReader(f);BufferedReader in = new BufferedReader(file);String s = new String();int i = 0;textArea.setText();while (s = in.readLine() != null)textArea.a

24、ppend(i + 1) + ： + s + n);rowStringi = s;comboBox.addItem(i + 1);i+;catch( Exception e )System.out.println( + e.toString();public static void main(String args)new CheckBrackets();6 计算器程序。程序运行结果：简易计算器程序原文件: Calculator.javaimport java.awt.*;import java.awt.event.*;import javax.swing.*;/* * 计算器程序. * 三个

25、文本框，加、减、乘、除按钮 在前两个文本框分别输入两个运算数 点击按钮后，在第三个文本框中显示计算结果. * author 黎明你好 */public class Calculator extends JFrame implements ActionListenerprivate static final long serialVersionUID = 1L;private JTextField oneField, twoField, resultField;private JButton addButton, subtractButton, multiplyButton, divideBut

26、ton, cleanButton;private JPanel panel1, panel2, panel3;public Calculator()super(简易计算器);oneField = new JTextField(10);twoField = new JTextField(10);resultField = new JTextField(20);addButton = new JButton(+);subtractButton = new JButton();multiplyButton = new JButton(*);divideButton = new JButton(/);

27、cleanButton = new JButton(CE);panel1 = new JPanel();panel2 = new JPanel();panel3 = new JPanel();oneField.setHorizontalAlignment(JTextField.RIGHT);twoField.setHorizontalAlignment(JTextField.RIGHT);resultField.setHorizontalAlignment(JTextField.RIGHT);resultField.setEditable(false);resultField.setBackg

28、round(Color.WHITE);resultField.setForeground(Color.RED);panel3.setLayout(new GridLayout(1, 4, 5, 5);panel3.add(addButton);panel3.add(subtractButton);panel3.add(multiplyButton);panel3.add(divideButton);panel3.add(cleanButton);addButton.addActionListener(this);subtractButton.addActionListener(this);mu

29、ltiplyButton.addActionListener(this);divideButton.addActionListener(this);cleanButton.addActionListener(this);panel1.add(new JLabel(输入x：);panel1.add(oneField);panel2.add(new JLabel(输入y：);panel2.add(twoField);this.setLayout(new FlowLayout();this.add(panel1);this.add(panel2);this.add(panel3);this.add(

30、resultField);this.setBounds(200, 100, 300, 200);this.setVisible(true);this.validate();this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void actionPerformed(ActionEvent e)double x = 0;double y = 0;tryx = Double.parseDouble(oneField.getText();y = Double.parseDouble(twoField.getText();catch(

31、NumberFormatException e1 )resultField.setText(请输入数字字符);if (e.getSource() = addButton)resultField.setText(X + Y = + (x + y);else if (e.getSource() = subtractButton)resultField.setText(X - Y = + (x - y);else if (e.getSource() = multiplyButton)resultField.setText(X Y = + (x * y);else if (e.getSource()

32、= divideButton)if (y = 0)resultField.setText(除数不能为0);elseresultField.setText(X Y = + (x / y);if (e.getSource() = cleanButton)oneField.setText();twoField.setText();resultField.setText();public static void main(String args)new Calculator();7 选择框应用程序。程序运行结果：选择框程序源文件: Work11_7.javaimport java.awt.*;impo

33、rt java.awt.event.*;import javax.swing.*;/* * 7 选择框应用程序. * 使用选择框选择商品,在文本框显示商品的单价、产地等信息. * author 黎明你好 */public class Work11_7 extends JFrame implements ActionListenerprivate static final long serialVersionUID = 1L;private JPanel panel1, panel2;private Goods goods1, goods2, goods3, goods4;private JTe

34、xtField showNameText; / 显示商品名字private JTextField showCostText; / 显示单价private JTextField showPlaceText;/ 显示产地private JTextField showWeightText; / 显示重量private ButtonGroup group;public Work11_7()super(选择框应用程序);panel1 = new JPanel();panel2 = new JPanel();group = new ButtonGroup();goods1 = new Goods(高露洁牙

35、膏, 10.45, 广州, 850);goods2 = new Goods(飘柔洗发露, 16.90, 天津, 1530.5);goods3 = new Goods(老干妈肉酱, 9.80, 贵阳, 210);goods4 = new Goods(可比克薯片, 8.50, 吉林, 45);showNameText = new JTextField(10);showCostText = new JTextField(10);showPlaceText = new JTextField(10);showWeightText = new JTextField(10);addGoods(goods1)

36、;addGoods(goods2);addGoods(goods3);addGoods(goods4);panel2.setLayout(new GridLayout(4, 2);panel2.add(new JLabel(商品名称：);panel2.add(showNameText);panel2.add(new JLabel(商品单价：);panel2.add(showCostText);panel2.add(new JLabel(商品产地：);panel2.add(showPlaceText);panel2.add(new JLabel(商品重量：);panel2.add(showWei

37、ghtText);this.setLayout(new FlowLayout();this.add(panel1);this.add(panel2);this.setBounds(200, 100, 400, 200);this.setVisible(true);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void addGoods(Goods goods)JCheckBox box = new JCheckBox(goods.getName();group.add(box);box.addActionListener(

38、this);panel1.add(box);public void actionPerformed(ActionEvent e)String name = e.getActionCommand();if (name.equals(goods1.getName()setGoodsText(goods1);if (name.equals(goods2.getName()setGoodsText(goods2);if (name.equals(goods3.getName()setGoodsText(goods3);if (name.equals(goods4.getName()setGoodsTe

39、xt(goods4);public void setGoodsText(Goods goods)showNameText.setText( + goods.getName();showPlaceText.setText( + goods.getPlace();showCostText.setText( + goods.getCost() + 元);showWeightText.setText( + goods.getWeight() + 克);public static void main(String args)new Work11_7();用到的商品类源文件：Goods.java/* *

40、商品类 */class Goodsprivate String name;/ 商品名称private double cost;/ 商品单价,单位元private String place;/ 商品产地private double weight;/ 商品重量，单位克public Goods(String name, double cost, String place, double weight) = name;this.cost = cost;this.place = place;this.weight = weight;public String getName()retu

41、rn name;public String getPlace()return place;public double getCost()return cost;public double getWeight()return weight;8 菜单应用程序。程序运行结果：菜单练习程序源文件：MenuFrame.javaimport java.awt.*;import java.awt.event.*;import javax.swing.*;/* * 菜单应用程序. * 一个菜单，一个菜单条含三个下拉式菜单，每个下拉式菜单又有2到3个菜单项. * 当选择某个菜单项时，弹出一个对话框显示菜单项的选

42、择信息. * author 黎明你好 */public class MenuFrame extends JFrame implements ActionListenerprivate static final long serialVersionUID = 1L;private JMenuBar menubar;private JMenu file_menu, edit_menu, look_menu, arrangeIcons_menu, tool_menu;private JMenuItem new_item, open_item;private JMenuItem copy_item,

43、paste_item;private JMenuItem refresh_item, byGroup_item, auto_item;private JTextArea textArea;public MenuFrame()super(菜单应用程序);textArea = new JTextArea();menubar = new JMenuBar();file_menu = new JMenu(文件);edit_menu = new JMenu(编辑);look_menu = new JMenu(查看);tool_menu = new JMenu(工具栏);arrangeIcons_menu

44、 = new JMenu(排列图标);new_item = new JMenuItem(新建);open_item = new JMenuItem(打开);copy_item = new JMenuItem(复制);paste_item = new JMenuItem(粘贴);refresh_item = new JMenuItem(刷新);byGroup_item = new JMenuItem(按组排列);auto_item = new JMenuItem(自动排列);menubar.add(file_menu);menubar.add(edit_menu);menubar.add(loo

45、k_menu);file_menu.add(new_item);file_menu.add(open_item);edit_menu.add(copy_item);edit_menu.add(paste_item);look_menu.add(refresh_item);look_menu.add(tool_menu);look_menu.add(arrangeIcons_menu);arrangeIcons_menu.add(byGroup_item);arrangeIcons_menu.add(auto_item);new_item.addActionListener(this);open

46、_item.addActionListener(this);copy_item.addActionListener(this);paste_item.addActionListener(this);refresh_item.addActionListener(this);byGroup_item.addActionListener(this);auto_item.addActionListener(this);this.setJMenuBar(menubar);this.add(textArea, BorderLayout.CENTER);this.setBounds(50, 50, 250,

47、 200);this.setVisible(true);this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);public void actionPerformed(ActionEvent e)String name = e.getActionCommand();JOptionPane.showMessageDialog(this, name + 背选中, 提示信息, JOptionPane.INFORMATION_MESSAGE);public static void main(String args)new MenuFrame();9 多线

48、程应用程序。程序运行结果：多线程程序源文件ThreadFrame.javaimport java.awt.BorderLayout;import java.awt.event.*;import javax.swing.*;* * 多线程应用程序. * 爸爸和妈妈不断往盘子中放桃子. * 三个儿子不断吃盘子汇总的桃子，吃的速度不一样. * 不能同时操作盘子,盘子最多可以放5个桃子. * author 黎明你好 */public class ThreadFrame extends JFrame implements Runnable, ActionListenerprivate static final long serialVersionUID = 1L;