Java2实用教程上机实践9，10，11

前言

大家好呀，大家肯定遇到过学校布置的作业不会做的情况吧？这个时候大量的网上找资料，找如何做这道题，为了帮助用Java2实用教程（耿祥义张跃平主编）的学子们拿满平时分，这里整理出这本书中比较难的上机实践9（组件与事件处理）10（输入输出流）11（JDBC数据库操作）源码，请注意由于是作者手动复制粘贴，可能会出现类名错误或者包名不匹配等错误，自行调整即可，希望能帮助到有需要的人，感谢观看

上机实践9：组件与事件处理

实验 1 算术测试

MainClass.java

public class MainClass {public static void main(String args[]) {cqut.test6.ComputerFrame frame;frame = new cqut.test6.ComputerFrame();frame.setTitle("算术测试");frame.setBounds(100, 100, 650, 180);}
}

ComputerFrame.java

public class ComputerFrame extends JFrame {JMenuBar menubar;JMenu choiceGrade;JMenuItem grade1, grade2;JTextField textOne, textTwo, textResult;JButton getProblem, giveAnwser;JLabel operatorLabel, message;Teacher teacherZhang;ComputerFrame() {teacherZhang = new Teacher();teacherZhang.setMaxInteger(20);setLayout(new FlowLayout());menubar = new JMenuBar();choiceGrade = new JMenu("选择级别");grade1 = new JMenuItem("幼⼉级别");grade2 = new JMenuItem("⼉童级别");grade1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {teacherZhang.setMaxInteger(10);}});grade2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {teacherZhang.setMaxInteger(50);}});choiceGrade.add(grade1);choiceGrade.add(grade2);menubar.add(choiceGrade);setJMenuBar(menubar);textOne = new JTextField(5);textTwo = new JTextField(5);textResult = new JTextField(5);operatorLabel = new JLabel("+");operatorLabel.setFont(new Font("Arial", Font.BOLD, 20));message = new JLabel("你还没有回答呢");getProblem = new JButton("获取题⽬");giveAnwser = new JButton("确认答案");add(getProblem);add(textOne);add(operatorLabel);add(textTwo);add(new JLabel("="));add(textResult);add(giveAnwser);add(message);textResult.requestFocus();textOne.setEditable(false);textTwo.setEditable(false);getProblem.setActionCommand("getProblem");textResult.setActionCommand("answer");giveAnwser.setActionCommand("answer");teacherZhang.setJTextField(textOne, textTwo, textResult);teacherZhang.setJLabel(operatorLabel, message);getProblem.addActionListener(teacherZhang);giveAnwser.addActionListener(teacherZhang);textResult.addActionListener(teacherZhang);setVisible(true);validate();setDefaultCloseOperation(DISPOSE_ON_CLOSE);}
}

Teacher.java

import java.util.Random;
import java.awt.event.*;
import javax.swing.*;
public class Teacher implements ActionListener {int numberOne, numberTwo;String operator = "";boolean isRight;Random random; //⽤于给出随机数int maxInteger; //题⽬中最⼤的整数JTextField textOne, textTwo, textResult;JLabel operatorLabel, message;Teacher() {random = new Random();}public void setMaxInteger(int n) {maxInteger = n;}public void actionPerformed(ActionEvent e) {String str = e.getActionCommand();if (str.equals("getProblem")) {numberOne = random.nextInt(maxInteger) + 1;//1 ⾄ maxInteger 之间的随机数;numberTwo = random.nextInt(maxInteger) + 1;double d = Math.random(); // 获取(0,1)之间的随机数if (d >= 0.5)operator = "+";elseoperator = "-";textOne.setText("" + numberOne);textTwo.setText("" + numberTwo);operatorLabel.setText(operator);message.setText("请回答");textResult.setText(null);} else if (str.equals("answer")) {String answer = textResult.getText();try {int result = Integer.parseInt(answer);if (operator.equals("+")) {if (result == numberOne + numberTwo)message.setText("你回答正确");elsemessage.setText("你回答错误");} else if (operator.equals("-")) {if (result == numberOne - numberTwo)message.setText("你回答正确");elsemessage.setText("你回答错误");}} catch (NumberFormatException ex) {message.setText("请输⼊数字字符");}}}public void setJTextField(JTextField... t) {textOne = t[0];textTwo = t[1];textResult = t[2];}public void setJLabel(JLabel... label) {operatorLabel = label[0];message = label[1];}
}

实验 2 布局与⽇历

CalenDdarPanel.java

import java.awt.*;
import javax.swing.*;
import java.time.*;public class CalendarPanel extends JPanel {GiveCalendar calendar;LocalDate[] dataArrays;public LocalDate currentDate;String name[] = {"⽇", "⼀", "⼆", "三", "四", "五", "六"};public CalendarPanel() {calendar = new GiveCalendar();currentDate = LocalDate.now();dataArrays = calendar.getCalendar(currentDate);showCalendar(dataArrays);}public void showCalendar(LocalDate[] dataArrays) {removeAll();GridLayout grid = new GridLayout(7, 7);setLayout(grid);JLabel[] titleWeek = new JLabel[7];JLabel[] showDay = new JLabel[42];for (int i = 0; i < 7; i++) {titleWeek[i] = new JLabel(name[i], JLabel.CENTER);
add(titleWeek[i]);}for (int i = 0; i < 42; i++) {showDay[i] = new JLabel("", JLabel.CENTER);}for (int k = 7, i = 0; k < 49; k++, i++) {add(showDay[i]);}int space = printSpace(dataArrays[0].getDayOfWeek());for (int i = 0, j = space + i; i < dataArrays.length; i++, j++) {showDay[j].setText("" + dataArrays[i].getDayOfMonth());}repaint();}public void setNext() {currentDate = currentDate.plusMonths(1);dataArrays = calendar.getCalendar(currentDate);showCalendar(dataArrays);}public void setPrevious() {currentDate = currentDate.plusMonths(-1);dataArrays = calendar.getCalendar(currentDate);showCalendar(dataArrays);}public int printSpace(DayOfWeek x) {int n = 0;switch (x) {case SUNDAY:n = 0;break;case MONDAY:n = 1;break;case TUESDAY:n = 2;break;case WEDNESDAY:n = 3;break;case THURSDAY:n = 4;break;case FRIDAY:n = 5;break;case SATURDAY:n = 6;break;}return n;}
}

GiveCalendar.java

import java.time.*;
public class GiveCalendar {public LocalDate [] getCalendar(LocalDate date) {date = date.withDayOfMonth(1);int days = date.lengthOfMonth();LocalDate dataArrays[] = new LocalDate[days];for (int i = 0; i < days; i++) {dataArrays[i] = date.plusDays(i);}return dataArrays;}
}

ShowCalendar.java

public class ShowCalendar extends JFrame {CalendarPanel showCalendar;JButton nextMonth;JButton previousMonth;JLabel showYear, showMonth;public ShowCalendar() {showCalendar = new CalendarPanel();add(showCalendar);nextMonth = new JButton("下⼀个⽉");previousMonth = new JButton("上⼀个⽉");showYear = new JLabel();showMonth = new JLabel();JPanel pNorth = new JPanel();showYear.setText("" + showCalendar.currentDate.getYear() + "年");showMonth.setText("" + showCalendar.currentDate.getMonthValue() + "⽉");pNorth.add(showYear);pNorth.add(previousMonth);pNorth.add(nextMonth);pNorth.add(showMonth);add(pNorth,java.awt.BorderLayout.NORTH);nextMonth.addActionListener((e) -> {showCalendar.setNext();showYear.setText("" + showCalendar.currentDate.getYear() + "年");showMonth.setText("" + showCalendar.currentDate.getMonthValue() + "⽉");});previousMonth.addActionListener((e) -> {showCalendar.setPrevious();showYear.setText("" + showCalendar.currentDate.getYear() + "年");showMonth.setText("" + showCalendar.currentDate.getMonthValue() + "⽉");});setSize(290, 260);setVisible(true);setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);}public static void main(String args[]) {new ShowCalendar();}
}

实验 3 英语单词拼写训练

LetterLabel.java

import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;public class LetterLabel extends JTextField implements FocusListener {LetterLabel() {setEditable(false);addFocusListener(this);//【代码 1】 //将当前对象注册为⾃⾝的焦点视器setBackground(Color.white);setFont(new Font("Arial", Font.PLAIN, 30));}public static LetterLabel[] getLetterLabel(int n) {LetterLabel a[] = new LetterLabel[n];for (int k = 0; k < a.length; k++)a[k] = new LetterLabel();return a;}public void focusGained(FocusEvent e) {setBackground(Color.cyan);}public void focusLost(FocusEvent e) {setBackground(Color.white);}public void setText(char c) {setText("" + c);}
}

RondomString.java

public class RondomString { //负责随机排列单词中的字⺟String str = "";public String getRondomString(String s) {StringBuffer strBuffer = new StringBuffer(s);int m = strBuffer.length();for (int k = 0; k < m; k++) {int index = (int) (Math.random() * strBuffer.length());//Math.random()返回(0,1)之间的随机数char c = strBuffer.charAt(index);str = str + c;strBuffer = strBuffer.deleteCharAt(index);}return str;}
}

SpellingWordFrame.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;public class SpellingWordFrame extends JFrame implements KeyListener, ActionListener {JTextField inputWord;JButton button;test8.LetterLabel label[];JPanel northP, centerP;Box wordBox;String hintMessage = "⽤⿏标单击字⺟，按左右箭头交换字⺟，将其排列成所输⼊的单词";JLabel messaageLabel = new JLabel(hintMessage);String word = "";SpellingWordFrame() {inputWord = new JTextField(12);button = new JButton("确定");button.addActionListener(this);inputWord.addActionListener(this);northP = new JPanel();northP.add(new JLabel("输⼊单词:"));northP.add(inputWord);northP.add(button);centerP = new JPanel();wordBox = Box.createHorizontalBox();centerP.add(wordBox);add(northP, BorderLayout.NORTH);add(centerP, BorderLayout.CENTER);add(messaageLabel, BorderLayout.SOUTH);setBounds(100, 100, 350, 180);setVisible(true);validate();setDefaultCloseOperation(DISPOSE_ON_CLOSE);}public void actionPerformed(ActionEvent e) {word = inputWord.getText();int n = word.length();test8.RondomString rondom = new test8.RondomString();String randomWord = rondom.getRondomString(word);wordBox.removeAll();messaageLabel.setText(hintMessage);if (n > 0) {label = test8.LetterLabel.getLetterLabel(n);for (int k = 0; k < label.length; k++) {label[k].setText("" + randomWord.charAt(k));wordBox.add(label[k]);label[k].addKeyListener(this); //将当前窗⼝注册为 label[k]的键盘监视器}validate();inputWord.setText(null);label[0].requestFocus();}}public void keyPressed(KeyEvent e) {test8.LetterLabel sourceLabel = (test8.LetterLabel) e.getSource();int index = -1;if (e.getKeyCode() == KeyEvent.VK_LEFT) {for (int k = 0; k < label.length; k++) {if (label[k] == sourceLabel) {index = k;break;}}if (index != 0) { //交换⽂本框中的字⺟String temp = label[index].getText();label[index].setText(label[index - 1].getText());label[index - 1].setText(temp);label[index - 1].requestFocus();}} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) { //判断按下的是否是→键for (int k = 0; k < label.length; k++) {if (label[k] == sourceLabel) {index = k;break;}}if (index != label.length - 1) {String temp = label[index].getText();label[index].setText(label[index + 1].getText());label[index + 1].setText(temp);label[index + 1].requestFocus();}}validate();}public void keyTyped(KeyEvent e) {}public void keyReleased(KeyEvent e) {String success = "";for (int k = 0; k < label.length; k++) {String str = label[k].getText();success = success + str;}if (success.equals(word)) {messaageLabel.setText("恭喜你，你成功了");for (int k = 0; k < label.length; k++) {label[k].removeKeyListener(this);label[k].removeFocusListener(label[k]);label[k].setBackground(Color.white);}inputWord.requestFocus();}}
}

WordMainClass.java

public class WordMainClass {public static void main(String args[]) {new SpellingWordFrame();}
}

实验 4 字体对话框

FontDialog.java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;public class FontDialog extends JDialog implements ItemListener, ActionListener {FontFamilyNames fontFamilyNames;int fontSize = 38;String fontName;JComboBox fontNameList, fontSizeList;JLabel label;Font font;JButton yes, cancel;static int YES = 1, NO = 0;int state = -1;FontDialog(JFrame f) {super(f);setTitle("字体对话框");font = new Font("宋体", Font.PLAIN, 12);fontFamilyNames = new FontFamilyNames();setModal(true);yes = new JButton("Yes");cancel = new JButton("cancel");yes.addActionListener(this);cancel.addActionListener(this);label = new JLabel("hello,奥运", JLabel.CENTER);fontNameList = new JComboBox();fontSizeList = new JComboBox();String name[] = fontFamilyNames.getFontName();fontNameList.addItem("字体");for (int k = 0; k < name.length; k++)fontNameList.addItem(name[k]);fontSizeList.addItem("大小");for (int k = 8; k < 72; k = k + 2)fontSizeList.addItem(new Integer(k));fontNameList.addItemListener(this);fontSizeList.addItemListener(this);JPanel pNorth = new JPanel();pNorth.add(fontNameList);pNorth.add(fontSizeList);add(pNorth, BorderLayout.NORTH);add(label, BorderLayout.CENTER);JPanel pSouth = new JPanel();pSouth.add(yes);pSouth.add(cancel);add(pSouth, BorderLayout.SOUTH);setBounds(100, 100, 280, 170);setDefaultCloseOperation(DISPOSE_ON_CLOSE);validate();}public void itemStateChanged(ItemEvent e) {if (e.getSource() == fontNameList) {fontName = (String) fontNameList.getSelectedItem();font = new Font(fontName, Font.PLAIN, fontSize);} else if (e.getSource() == fontSizeList) {Integer m = (Integer) fontSizeList.getSelectedItem();fontSize = m.intValue();font = new Font(fontName, Font.PLAIN, fontSize);}label.setFont(font);label.repaint();validate();}public void actionPerformed(ActionEvent e) {if (e.getSource() == yes) {state = YES;setVisible(false);} else if (e.getSource() == cancel) {state = NO;setVisible(false);}}public int getState() {return state;}public Font getFont() {return font;}
}

FontDialogMainClass.java

public class FontDialogMainClass {public static void main(String args[]) {FrameHaveDialog win = new FrameHaveDialog();}
}

FontFamilyNames.java

import java.awt.GraphicsEnvironment;
public class FontFamilyNames {String allFontNames[];public String[] getFontName() {GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();allFontNames = ge.getAvailableFontFamilyNames();return allFontNames;}
}

FrameHaveDialog.java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class FrameHaveDialog extends JFrame implements ActionListener {JTextArea text;JButton buttonFont;FrameHaveDialog() {buttonFont = new JButton("设置字体");text = new JTextArea("java2实用教程");buttonFont.addActionListener(this);add(buttonFont, BorderLayout.NORTH);add(text);setBounds(60, 60, 300, 300);setVisible(true);validate();setDefaultCloseOperation(DISPOSE_ON_CLOSE);}public void actionPerformed(ActionEvent e) {if (e.getSource() == buttonFont) {FontDialog dialog = new FontDialog(this);dialog.setVisible(true);if (dialog.getState() == FontDialog.YES) {text.setFont(dialog.getFont());text.repaint();}if (dialog.getState() == FontDialog.NO) {text.repaint();}}}
}

上机实践 10 输⼊和输出流

实验 1 分析成绩单

AnalysisResult.java

import java.io.*;public class AnalysisResult {public static void main(String[] args) {File fRead = new File("score.txt");File fWrite = new File("scoreAnalysis.txt");try{Writer out = new FileWriter(fWrite,true);BufferedWriter bufferWrite = new BufferedWriter(out);Reader in = new FileReader(fRead);BufferedReader bufferRead =new BufferedReader(in) ;String str = null;while((str=bufferRead.readLine())!=null) {double totalScore= Fenxi.getTotalScore(str);str = str+" 总分:"+totalScore;System.out.println(str);bufferWrite.write(str);bufferWrite.newLine();}bufferRead.close();bufferWrite.close();}catch(IOException e) {System.out.println(e.toString());}}
}

Fenxi.java

import java.util.*;public class Fenxi {public static double getTotalScore(String s) {Scanner scanner = new Scanner(s);scanner.useDelimiter("[^0123456789.]+");double totalScore=0;while(scanner.hasNext()){try{ double score = scanner.nextDouble();totalScore = totalScore+score;}catch(InputMismatchException exp){String t = scanner.next();}}return totalScore;}
}

实验 2 统计英⽂单词

OutputWordMess.java

import java.util.*;public class OutputWordMess {public static void main(String args[]) {Vector<String> allWord,noSameWord;WordStatistic statistic =new WordStatistic();statistic.setFileName("hello.txt");statistic.wordStatistic();allWord=statistic.getAllWord();noSameWord=statistic.getNoSameWord();System.out.println("共有"+allWord.size()+"个英⽂单词");System.out.println("有"+noSameWord.size()+"个互不相同英⽂单词");System.out.println("按出现频率排列:");int count[]=new int[noSameWord.size()];for(int i=0;i<noSameWord.size();i++) {String s1 = noSameWord.elementAt(i);for(int j=0;j<allWord.size();j++) {String s2=allWord.elementAt(j);if(s1.equals(s2))count[i]++;}}for(int m=0;m<noSameWord.size();m++) {for(int n=m+1;n<noSameWord.size();n++) {if(count[n]>count[m]) {String temp=noSameWord.elementAt(m);noSameWord.setElementAt(noSameWord.elementAt(n),m);noSameWord.setElementAt(temp,n);int t=count[m];count[m]=count[n];count[n]=t;}}}for(int m=0;m<noSameWord.size();m++) {double frequency=(1.0*count[m])/allWord.size();System.out.printf("%s:%-7.3f",noSameWord.elementAt(m),frequency);}}
}

WordStatistic.java

import java.io.*;
import java.util.*;public class WordStatistic {Vector<String> allWord,noSameWord;File file = new File("english.txt");Scanner sc = null;String regex;WordStatistic() {allWord = new Vector<String>();noSameWord = new Vector<String>();regex= "[\\s\\d\\p{Punct}]+";try{sc = new Scanner(file) ;sc.useDelimiter(regex);}catch(IOException exp) {System.out.println(exp.toString());}}void setFileName(String name) {file = new File(name);try{sc = new Scanner(file);sc.useDelimiter(regex);}catch(IOException exp) {System.out.println(exp.toString());}}public void wordStatistic() {try{while(sc.hasNext()){String word = sc.next();allWord.add(word);if(!noSameWord.contains(word))noSameWord.add(word);}}catch(Exception e){}}public Vector<String> getAllWord() {return allWord;}public Vector<String> getNoSameWord() {return noSameWord;}
}

实验 3 读取压缩⽂件

ReadZipFile.java

import java.io.*;
import java.util.zip.*;public class ReadZipFile {public static void main(String[] args) {File f=new File("book.zip");File dir=new File("mybook");byte b[]=new byte[100];dir.mkdir();try{ZipInputStream in=new ZipInputStream(new FileInputStream(f));ZipEntry zipEntry=null;while((zipEntry=in.getNextEntry())!=null) {File file=new File(dir,zipEntry.getName());FileOutputStream out=new  FileOutputStream(file);int n=-1;System.out.println(file.getAbsolutePath()+"的内容：");while((n=in.read(b,0,100))!=-1) {String str=new String(b,0,n);System.out.println(str);out.write(b,0,n);}out.close();}in.close();}catch(IOException ee) {System.out.println(ee);}}
}

上机实践 11 JDBC 数据库操作

实验 1 抽取样本

ComputerAverPrice.java

public static void main(String args[]) {Connection con=null;Statement sql;ResultSet rs;try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");}catch(Exception e){ }try{con = DriverManager.getConnection("jdbc:Access://Book.accdb","","");}catch(SQLException e){System.out.println(e);}try{sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);rs=sql.executeQuery("SELECT*FROM bookList");rs.last();int max = rs.getRow();System.out.println("表共有"+max+"条记录,随机抽取 10 条记录：");int [] a =GetRandomNumber.getRandomNumber(max,10);float sum = 0;for(int i:a){rs.setFetchDirection(i);float price = rs.getFloat(3);sum = sum+price;}con.close();System.out.println("平均价格:"+sum/a.length);}catch(SQLException e) { }}
}

etRandomNumber.java

public class GetRandomNumber {public static int[] getRandomNumber(int max, int amount) {Vector<Integer> vector = new Vector<Integer>();for (int i = 1; i <= max; i++) {vector.add(i);}int result[] = new int[amount];while (amount > 0) {int index = new Random().nextInt(vector.size());int m = vector.elementAt(index);vector.removeElementAt(index);result[amount - 1] = m;amount--;}return result;}
}

实验 2 ⽤户转账

 TurnMoney.java

import java.sql.*;public class TurnMoney {public static void main(String args[]) {Connection con = null;Statement sql;ResultSet rs;try {Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");} catch (ClassNotFoundException e) {System.out.println("" + e);}try {double n = 100;con = DriverManager.getConnection("jdbc:odbc:tom", "", "");con.setAutoCommit(false);sql = con.createStatement();rs = sql.executeQuery("SELECT * FROM card1 WHERE number='zhangsan'");rs.next();double amountOne = rs.getDouble("amount");System.out.println("转账操作之前 zhangsan 的钱款数额:" + amountOne);rs = sql.executeQuery("SELECT * FROM card2 WHERE number='xidanShop'");rs.next();double amountTwo = rs.getDouble("amount");System.out.println("转账操作之前 xidanShop 的钱款数额:" + amountTwo);amountOne = amountOne - n;amountTwo = amountTwo + n;sql.executeUpdate("UPDATE card1 SET amount =" + amountOne + " WHERE number ='zhangsan'");sql.executeUpdate("UPDATE card2 SET amount =" + amountTwo + " WHERE number ='xidanShop'");con.commit();con.setAutoCommit(true);rs = sql.executeQuery("SELECT * FROM card1 WHERE number='zhangsan'");rs.next();amountOne = rs.getDouble("amount");System.out.println("转账操作之后 zhangsan 的钱款数额:" + amountOne);rs = sql.executeQuery("SELECT * FROM card2 WHERE number='xidanShop'");rs.next();amountTwo = rs.getDouble("amount");System.out.println("转账操作之后 xidanShop 的钱款数额:" + amountTwo);con.close();} catch (SQLException e) {try {con.rollback();} catch (SQLException exp) {}System.out.println(e.toString());}}
}