自考JAVA语言程序设计-习题答案和源代码(实验大纲)

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.javaimportjavax.swing.*;/***1字符统计程序<BR>*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.<BR>*@author黎明你好*/publicclassStaChar{ publicstaticvoidmain(String[]args) { Stringstr=JOptionPane.showInputDialog("请输入字符串："); char[]c=str.toCharArray(); intnumberCount=0; intletterCount=0; for(inti=0;i<c.length;i++) { if(c[i]<'9'&&c[i]>'0') numberCount++; elseif((c[i]>'A'&&c[i]<'Z')||(c[i]>'a'&&c[i]<'z')) letterCount++; } Stringresult="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.javaimportjavax.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.<BR>*@author黎明你好*/publicclassPrintPrime{ privateintnumber;//正整数 privateStringresult=""; publicPrintPrime()//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(inti=2;i<=number;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 *@parammessage-在弹出的对话框中，显示提示信息 *@parammin-要求此数必须大于等于min *@return-返回符合规则的整数 */ publicintgetIntegerNumber(Stringmessage,intmin) { Stringstr=JOptionPane.showInputDialog(null,message,"提示信息", JOptionPane.INFORMATION_MESSAGE); intnumber=-1; try { number=Integer.parseInt(str);//得到输入的正整数 } catch(Exceptione) { 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 } else returnnumber; } /** *判断是否是素数的方法 *@paramn-需要判断的数 *@return-是素数返回true，否则返回false */ publicbooleanisPrimeNumber(intn) { for(inti=2;i<n;i++) { if(n%i==0) returnfalse; } returntrue; } /**main方法*/ publicstaticvoidmain(String[]args) { newPrintPrime(); }}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*/abstractclassShape{ publicfloatarea() { return0.0f; }}/***圆形类*/classCircleextendsShape{ privatefloatR; publicCircle(floatr) { R=r; } publicfloatarea() { return(float)(Math.PI*R*R); } }/***矩形类*/classRectangleextendsShape{ privatefloatw,h; publicRectangle(floatw,floath) { this.w=w; this.h=h; } publicfloatarea() { returnw*h; }}publicclassWork11_3{ publicstaticvoidmain(Stringargs[]) { Circlec; Rectangler; c=newCircle(2.0f); r=newRectangle(3.0f,5.0f); System.out.println("圆面积"+returnArea(c)); System.out.println("长方形面积"+returnArea(r)); } staticfloatreturnArea(Shapes) { returns.area(); }}4数组排序程序源文件：Work11_4.javaimportjavax.swing.*;importjava.util.*;/***4数组排序程序.<BR>*输入整数序列,对输入的整数进行排序,输出结果.<BR>*@author黎明你好*/publicclassWork11_4{ publicstaticfinalintRISE=0; publicstaticfinalintLOWER=1; publicstaticvoidmain(String[]args) { Stringstr=JOptionPane.showInputDialog("请输入字符串："); StringTokenizertoken=newStringTokenizer(str,",.;:"); intmode=Work11_4.RISE;//排列模式，默认为升序排列 intcount=token.countTokens();//输入的整数的个数 intarray[]=newint[count]; intindex=0; while(token.hasMoreTokens()) { try { array[index]=Integer.parseInt(token.nextToken()); index++; } catch(Exceptione) { 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 Stringresult=newString(); StringmodeString=newString(); 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(inti=0;i<array.length;i++) { result=result+array[i]+"，"; } if(result!=null) JOptionPane .showMessageDialog(null,result,modeString,JOptionPane.INFORMATION_MESSAGE); } /** *给数组排序的方法 *@paramarray-需要排序的数组 *@parammode-排序的模式，可以为RISE，LOWER */ publicstaticvoidsort(intarray[],intmode) { for(inti=0;i<array.length;i++) { for(intj=0;j<array.length-1;j++) { if(mode==Work11_4.RISE&&array[j]>array[j+1]) { inttemp=array[j]; array[j]=array[j+1]; array[j+1]=temp; } if(mode==Work11_4.LOWER&&array[j]<array[j+1]) { inttemp=array[j]; array[j]=array[j+1]; array[j+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.javaimportjava.awt.*;importjava.awt.event.*;importjavax.swing.*;importunit9.MyFileFilter;importjava.io.*;/***5字符串处理程序.<BR>*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.<BR>*@author黎明你好*/publicclassCheckBracketsextendsJFrameimplementsActionListener,ItemListener{ privatestaticfinallongserialVersionUID=1L; privateJFileChooserfileChooser; privateJButtonopenFileButton; privateJComboBoxcomboBox; privateJTextFieldshowRowStringField; privateJTextFieldshowMessageField; privateJTextAreatextArea; privateJPanelnorthPanel,control_panel; privateStringrowString[]; privateFilefile=null; publicCheckBrackets() { super("检测圆、花括号匹配程序"); fileChooser=newJFileChooser(System.getProperty("user.dir")); openFileButton=newJButton("打开文件"); showRowStringField=newJTextField(); showMessageField=newJTextField(20); textArea=newJTextArea(); comboBox=newJComboBox(); northPanel=newJPanel(); control_panel=newJPanel(); rowString=newString[1000]; fileChooser.addChoosableFileFilter(newMyFileFilter("txt"));//文件筛选 textArea.setLineWrap(true); showRowStringField.setEditable(false); showRowStringField.setBackground(Color.WHITE); showMessageField.setEditable(false); showMessageField.setBackground(Color.WHITE); openFileButton.addActionListener(this); comboBox.addItemListener(this); comboBox.addItem("请选择"); control_panel.add(openFileButton); control_panel.add(newJLabel("选择代码行:")); control_panel.add(comboBox); control_panel.add(newJLabel("检测结果:")); control_panel.add(showMessageField); northPanel.setLayout(newGridLayout(2,1,10,10)); northPanel.add(control_panel); northPanel.add(showRowStringField); this.add(northPanel,BorderLayout.NORTH); this.add(newJScrollPane(textArea),BorderLayout.CENTER); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setBounds(50,50,550,500); this.setVisible(true); this.validate(); } publicvoidactionPerformed(ActionEvente) { showMessageField.setText(""); intmessage=fileChooser.showOpenDialog(this); if(message==JFileChooser.APPROVE_OPTION) { file=fileChooser.getSelectedFile(); comboBox.removeAllItems(); comboBox.addItem("请选择"); readFile(file); } } publicvoiditemStateChanged(ItemEvente) { intindex=comboBox.getSelectedIndex(); if(index>=1) { showRowStringField.setText(rowString[index-1]); charc[]=rowString[index-1].toCharArray(); intcount1=0; intcount2=0; for(inti=0;i<c.length;i++) { if(c[i]=='{') count1++; if(c[i]=='}') count1--; if(c[i]=='(') count2++; if(c[i]==')') 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"); elseif(count2!=0) showMessageField.setText("第"+index+"行，小括号'()'匹配错误"); elseif(count1!=0&&count2!=0) showMessageField.setText("第"+index+"行，大、小括号都匹配错误"); elseif(count1==0&&count2==0) showMessageField.setText("括号匹配正确"); } } publicvoidreadFile(Filef) { if(f!=null) try { FileReaderfile=newFileReader(f); BufferedReaderin=newBufferedReader(file); Strings=newString(); inti=0; textArea.setText(""); while((s=in.readLine())!=null) { textArea.append((i+1)+"："+s+"\n"); rowString[i]=s; comboBox.addItem(i+1); i++; } } catch(Exceptione) { System.out.println(""+e.toString()); } } publicstaticvoidmain(String[]args) { newCheckBrackets(); }}6计算器程序。程序运行结果：简易计算器程序原文件:Calculator.javaimportjava.awt.*;importjava.awt.event.*;importjavax.swing.*;/***计算器程序.<BR>*三个文本框，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.<BR>*@author黎明你好*/publicclassCalculatorextendsJFrameimplementsActionListener{ privatestaticfinallongserialVersionUID=1L; privateJTextFieldoneField,twoField,resultField; privateJButtonaddButton,subtractButton,multiplyButton,divideButton,cleanButton; privateJPanelpanel1,panel2,panel3; publicCalculator() { super("简易计算器"); oneField=newJTextField(10); twoField=newJTextField(10); resultField=newJTextField(20); addButton=newJButton("+"); subtractButton=newJButton("－"); multiplyButton=newJButton("*"); divideButton=newJButton("/"); cleanButton=newJButton("CE"); panel1=newJPanel(); panel2=newJPanel(); panel3=newJPanel(); oneField.setHorizontalAlignment(JTextField.RIGHT); twoField.setHorizontalAlignment(JTextField.RIGHT); resultField.setHorizontalAlignment(JTextField.RIGHT); resultField.setEditable(false); resultField.setBackground(Color.WHITE); resultField.setForeground(Color.RED); panel3.setLayout(newGridLayout(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); multiplyButton.addActionListener(this); divideButton.addActionListener(this); cleanButton.addActionListener(this); panel1.add(newJLabel("输入x：")); panel1.add(oneField); panel2.add(newJLabel("输入y：")); panel2.add(twoField); this.setLayout(newFlowLayout()); this.add(panel1); this.add(panel2); this.add(panel3); this.add(resultField); this.setBounds(200,100,300,200); this.setVisible(true); this.validate(); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } publicvoidactionPerformed(ActionEvente) { doublex=0; doubley=0; try { x=Double.parseDouble(oneField.getText()); y=Double.parseDouble(twoField.getText()); } catch(NumberFormatExceptione1) { resultField.setText("请输入数字字符"); } if(e.getSource()==addButton) { resultField.setText("X+Y="+(x+y)); } elseif(e.getSource()==subtractButton) { resultField.setText("X-Y="+(x-y)); } elseif(e.getSource()==multiplyButton) { resultField.setText("X¡ÁY="+(x*y)); } elseif(e.getSource()==divideButton) { if(y==0) resultField.setText("除数不能为0"); else resultField.setText("X¡ÂY="+(x/y)); } if(e.getSource()==cleanButton) { oneField.setText(""); twoField.setText(""); resultField.setText(""); } } publicstaticvoidmain(String[]args) { newCalculator(); }}7选择框应用程序。程序运行结果：选择框程序源文件:Work11_7.javaimportjava.awt.*;importjava.awt.event.*;importjavax.swing.*;/***7选择框应用程序.<BR>*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.<BR>*@author黎明你好*/publicclassWork11_7extendsJFrameimplementsActionListener{ privatestaticfinallongserialVersionUID=1L; privateJPanelpanel1,panel2; privateGoodsgoods1,goods2,goods3,goods4; privateJTextFieldshowNameText;//显示商品名字 privateJTextFieldshowCostText;//显示单价 privateJTextFieldshowPlaceText;//显示产地 privateJTextFieldshowWeightText;//显示重量 privateButtonGroupgroup; publicWork11_7() { super("选择框应用程序"); panel1=newJPanel(); panel2=newJPanel(); group=newButtonGroup(); goods1=newGoods("高露洁牙膏",10.45,"广州",850); goods2=newGoods("飘柔洗发露",16.90,"天津",1530.5); goods3=newGoods("老干妈肉酱",9.80,"贵阳",210); goods4=newGoods("可比克薯片",8.50,"吉林",45); showNameText=newJTextField(10); showCostText=newJTextField(10); showPlaceText=newJTextField(10); showWeightText=newJTextField(10); addGoods(goods1); addGoods(goods2); addGoods(goods3); addGoods(goods4); panel2.setLayout(newGridLayout(4,2)); panel2.add(newJLabel("商品名称：")); panel2.add(showNameText); panel2.add(newJLabel("商品单价：")); panel2.add(showCostText); panel2.add(newJLabel("商品产地：")); panel2.add(showPlaceText); panel2.add(newJLabel("商品重量：")); panel2.add(showWeightText); this.setLayout(newFlowLayout()); this.add(panel1); this.add(panel2); this.setBounds(200,100,400,200); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } publicvoidaddGoods(Goodsgoods) { JCheckBoxbox=newJCheckBox(goods.getName()); group.add(box); box.addActionListener(this); panel1.add(box); } publicvoidactionPerformed(ActionEvente) { Stringname=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())) setGoodsText(goods4); } publicvoidsetGoodsText(Goodsgoods) { showNameText.setText(""+goods.getName()); showPlaceText.setText(""+goods.getPlace()); showCostText.setText(""+goods.getCost()+"元"); showWeightText.setText(""+goods.getWeight()+"克"); } publicstaticvoidmain(Stringargs[]) { newWork11_7(); }}用到的商品类源文件：Goods.java/***商品类*/classGoods{ privateStringname;//商品名称 privatedoublecost;//商品单价,单位元 privateStringplace;//商品产地 privatedoubleweight;//商品重量，单位克 publicGoods(Stringname,doublecost,Stringplace,doubleweight) { =name; this.cost=cost; this.place=place; this.weight=weight; } publicStringgetName() { returnname; } publicStringgetPlace() { returnplace; } publicdoublegetCost() { returncost; } publicdoublegetWeight() { returnweight; }}8菜单应用程序。程序运行结果：菜单练习程序源文件：MenuFrame.javaimportjava.awt.*;importjava.awt.event.*;importjavax.swing.*;/***菜单应用程序.<BR>*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.<BR>*当选择某个菜单项时，弹出一个对话框显示菜单项的选择信息.<BR>*@author黎明你好*/publicclassMenuFrameextendsJFrameimplementsActionListener{ privatestaticfinallongserialVersionUID=1L; privateJMenuBarmenubar; privateJMenufile_menu,edit_menu,look_menu,arrangeIcons_menu,tool_menu; privateJMenuItemnew_item,open_item; privateJMenuItemcopy_item,paste_item; privateJMenuItemrefresh_item,byGroup_item,auto_item; privateJTextAreatextArea; publicMenuFrame() { super("菜单应用程序"); textArea=newJTextArea(); menubar=newJMenuBar(); file_menu=newJMenu("文件"); edit_menu=newJMenu("编辑"); look_menu=newJMenu("查看"); tool_menu=newJMenu("工具栏"); arrangeIcons_menu=newJMenu("排列图标"); new_item=newJMenuItem("新建"); open_item=newJMenuItem("打开"); copy_item=newJMenuItem("复制"); paste_item=newJMenuItem("粘贴"); refresh_item=newJMenuItem("刷新"); byGroup_item=newJMenuItem("按组排列"); auto_item=newJMenuItem("自动排列"); menubar.add(file_menu); menubar.add(edit_menu); menubar.add(look_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_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(50,50,250,200); this.setVisible(true); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } publicvoidactionPerformed(ActionEvente) { Stringname=e.getActionCommand(); JOptionPane.showMessageDialog(this,name+"背选中","提示信息",JOptionPane.INFORMATION_MESSAGE); } publicstaticvoidmain(String[]args) { newMenuFrame(); }}9多线程应用程序。程序运行结果：多线程程序源文件ThreadFrame.javaimportjava.awt.BorderLayout;importjava.awt.event.*;importjavax.swing.*;***多线程应用程序.<BR>*爸爸和妈妈不断往盘子中放桃子.<BR>*三个儿子不断吃盘子汇总的桃子，吃的速度不一样.<BR>*不能同时操作盘子,盘子最多可以放5个桃子.<BR>*@author黎明你好*/publicclassThreadFrameextendsJFrameimplementsRunnable,ActionListener{ privatestaticfinallongserialVersionUID=1L; privateJPanelpanel; privateJButtonbutton; privateJTextAreatextArea; privateThreadfatherThread,motherThread,childOneThread,childTwoThread,childThreeThread; privateintpeachCount=0;//盘子桃子数量 publicstaticfinalintEAT=0;//动作，吃桃子 publicstaticfinalintPRODUCE=1;//动作，放桃子 publicstaticfinalintCOUNTDISH=5;//盘子可以放桃子总数 publicstaticfinalintCOUNT=50;//总的执行次数，防止程序一直执行下去 privateintnumber=0; publicThreadFrame() { super("多线程应用程序"); fatherThread=newThread(this); motherThread=newThread(this); childOneThread=newThread(this); childTwoThread=newThread(this); childThreeThread=newThread(this); panel=newJPanel(); button=newJButton("开始程序"); textArea=newJTextArea(); button.addActionListener(this); panel.add(button); this.add(panel,BorderLayout.NORTH); this.add(newJScrollPane(textArea),BorderLayout.CENTER); this.setBounds(10,10,500,700); this.setVisible(true); this.validate(); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } publicvoidactionPerformed(ActionEvente) { fatherThread.start(); motherThread.start(); childOneThread.start(); childTwoThread.start(); childThreeThread.start(); } publicvoidrun() { if(Thread.currentThread()==fatherThread) { while(number<COUNT) { dish(PRODUCE,"爸爸-"); try { Thread.sleep(100); } catch(InterruptedExceptione) { e.printStackTrace(); } number++; } } if(Thread.currentThread()==motherThread) { while(number<COUNT) { dish(PRODUCE,"妈妈-"); try { Thread.sleep(200); } catch(InterruptedExceptione) { e.printStackTrace(); } number++; } } if(Thread.currentThread()==childOneThread) { while(number<COUNT) { dish(EAT,"老大-"); try { Thread.sleep(1000); } catch(InterruptedExceptione) { e.printStackTrace(); } number++; } } if(Thread.currentThread()==childTwoThread) { while(number<COUNT) { dish(EAT,"老二-"); try { Thread.sleep(500); } catch(InterruptedExceptione) { e.printStackTrace(); } number++; } } if(Thread.currentThread()==childThreeThread) { while(number<COUNT) { dish(EAT,"老三-"); try { Thread.sleep(300); } catch(InterruptedExceptione) { e.printStackTrace(); } number++; } } } /** *对盘子操作的方法 *@paramaction-动作，分为吃EAT，和放PRODUCE *@paramname-动作的产生者 */ publicsynchronizedvoiddish(intaction,Stringname) { if(action==EAT) { while(true) { if(peachCount>=1) break; else { try { textArea.append("eatpeachwait"+name+"吃桃子等待\n"); wait(); } catch(InterruptedExceptione) { e.printStackTrace(); } } } peachCount--; textArea.append(name+"吃掉一个桃子\n"); textArea.append("----------------盘子中桃子数量为："+peachCount+"个\n"); } if(action==PRODUCE) { while(true) { if(peachCount<COUNTDISH) break; else { try { textArea.append("producepeachwait"+name+"放桃子等待\n"); wait(); } catch(InterruptedExceptione) { e.printStackTrace(); } } } peachCount++; textArea.append(name+"放上一个桃子\n"); textArea.append("----------------盘子中桃子数量为："+peachCount+"个\n"); } notify(); } publicstaticvoidmain(String[]args) { newThreadFrame(); }}10数据文件应用程序。原文件：OpenAndSaveFile.javaimportjava.awt.*;importjava.awt.event.*;importjavax.swing.*;importjava.io.*;/***保存和打开文件*@author黎明你好*/publicclassOpenAndSaveFileextendsJFrameimplementsActionListener{ privatestaticfinallongserialVersionUID=1L; privateJFileChooserfileChooser;//文件选择对话框 privateJPanelnorthPanel;//布局用的panel privateJButtonopenFileButton,saveFileButton;//打开和保存文件按钮 privateJLabellabel;//