JAVA课堂练习.doc

1.将矩阵行列互调并输出。public class ArrayExe public static void main(String args) int count1=1;int count2=0;int array=new int33; ArrayExe arr=new ArrayExe();/for(int i=0;iarray.length;i+)for(int j=0;jarrayi.length;j+)arrayij=count1+;System.out.println(原矩阵中元素:);arr.prin(array); for(int i=0;iarray.length;i+)for(int j=i;jarrayi.length;j+)count2=arrayij;arrayij=arrayji;arrayji=count2;System.out.println(行列互调后的结果:);arr.prin(array);/ public void prin(int array) int count=0;for(int i=0;iarray.length;i+)for(int j=0;jarrayi.length;j+) System.out.print(arrayij+t); count+; if(count%3=0) System.out.println(); System.out.println();2.计算购物结算,用户可以享受购物8折的优惠，请计算实际消费金额, (1)创建Java类Pay(2)在Pay.java文件中声明变量存储信息(3)计算总金额,消费总额 = 各商品的消费金额之和 * 折扣public class Paypublic static void main(String args) / TODO Auto-generated method stubfloat applePrice,orangePrice;int appleNum,orageNum;float appleAmount,orangeAmount;float amount;float discountAmount;/给变量赋值applePrice=2.5f; /float类型后加上forangePrice=3;appleNum=3;orageNum=2;amount=applePrice*appleNum+orangePrice*orageNum;discountAmount=amount*0.8f; /discountAmount是float类型，所以是.8fSystem.out.println(打折后的金额：+discountAmount);2. 打印购物小票并计算积分.import java.util.Scanner;public class Array2 public static void main(String args) int count;int array=new int10;int array2=new int10; for(count=0;count5;count+)Scanner input=new Scanner(System.in);System.out.print(请输入第+(count+1)+个会员的积分:); arraycount=input.nextInt(); System.out.println();System.out.println(序号tt历史积分tt最新积分);for(int i=0;i5 ;i+)array2i=arrayi+500;System.out.println(i+1)+tt+arrayi+tt+array2i);3.求110之间的所有偶数和（使用for循环）public class sum public static void main(String args) int countSum=0; for(int count=2;count=10;count+=2) countSum+=count; System.out.println(1-10之间偶数之和：ncountSum=+countSum);4. 依次录入同学学习JAVA的成绩，统计各个分数段的成绩的人数。import java.util.Scanner;public class javaGrade public static void main(String args) Scanner input=new Scanner(System.in);int count1=0,count2=0,count3=0,count4=0,count5=0,count6=0 ; System.out.println(输入所有JAVA成绩：);for(int i=0;i5;i+)int stb=input.nextInt();switch(stb/10)case 9:count1+; break;case 8:count2+; break;case 7:count3+; break;case 6:count4+; break;case 10:count5+; break; default:count6+; break;System.out.println(100分的人数:+count5);System.out.println(90-100分的人数:+count1);System.out.println(80-90分的人数:+count2);System.out.println(70-80分的人数:+count3);System.out.println(60-70分的人数:+count4);System.out.println(小于分的人数:+count6); 5. 以表格的形式输出笔购物金额及总金额 升序排列金额数据import java.util.Scanner;import java.util.Arrays;public class ArrayExe public static void main(String args) int count;double Price=new double5;double sum=0;/输入部分for(count=0;count5;count+)Scanner input=new Scanner(System.in);System.out.print(请输入第+(count+1)+笔购物金额:); Pricecount=input.nextDouble(); System.out.println();/输出部分System.out.println(序号tt金额(元);for(int i=0;i5 ;i+)System.out.println(i+1)+tt+Pricei);sum+=Pricei;System.out.println(总金额tt+sum);System.out.println();/表格输出部分Arrays.sort(Price);System.out.println(-);System.out.print(|序号t|);for(int i=0;i5;i+)System.out.print(i+1)+t|);System.out.print(总金额+t|);System.out.println();System.out.println(-);System.out.print(|金额t|);for(int i=0;i0&age100) this.age=age; else throw new Exception(年龄必须在1-100之间); public void printAge() System.out.println(年龄:+this.age); public class testPerson public static void main(String args) Person person=new Person(); try person.setAge(101); person.printAge(); catch(Exception e) e.printStackTrace(); public class testPerson public static void main(String args) Person person=new Person(); try person.setAge(101); person.printAge(); catch(Exception e) e.printStackTrace(); public class testPerson public static void main(String args) Person person=new Person(); try person.setAge(101); person.printAge(); catch(Exception e) e.printStackTrace(); (2)按照控制台提示输入13之间任一个数字，程序将输出相应的课程名称根据键盘输入进行判断。如果输入正确，输出对应课程名称。如果输入错误，给出错误提示不管输入是否正确，均输出“欢迎提出建议”语句import java.util.Scanner;public class Courses public static void main(String args) int n; try Scanner input=new Scanner(System.in); System.out.print(请输入数字:1,2或3：); n=input.nextInt(); switch(n) case 1: System.out.println(英语); break; case 2: System.out.println(数学); break; case 3: System.out.println(语文); break; default: System.out.println(必须使用1-3); catch(Exception e) System.err.println(发生异常,必须使用1-3); finally System.out.println(欢迎提出建议); 8事件的操作import java.awt.*;import javax.swing.*;import java.awt.event.*;public class FirstFrame public static class moniter1 implements ActionListener public void actionPerformed(ActionEvent arg0) System.out.print(我被击中了); public static class moniter2 implements ActionListener public void actionPerformed(ActionEvent arg0) System.out.print(你被击中了); public static void main(String args) / TODO Auto-generated method stub JFrame jf = new JFrame(); jf.setTitle(this is my first Frame!); jf.setBounds(10,10,400,400); jf.setVisible(true); GridLayout gridLayout=new GridLayout(3,3,10,20); jf.setLayout(gridLayout); JButton btn1 = new JButton(我); btn1.addActionListener(new moniter1(); jf.add(btn1); JButton btn2 = new JButton(你); btn2.addActionListener(new moniter2(); jf.add(btn2); jf.add(new JButton(3); jf.add(new JButton(4); jf.add(new JButton(5); jf.add(new JButton(6); jf.add(new JButton(7); jf.add(new JButton(8); jf.add(new JButton(9); jf.validate(); 控件综合实验import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.print.DocFlavor.URL;import javax.swing.*;import javax.swing.border.Border;import javax.swing.border.EtchedBorder;import javax.swing.border.TitledBorder;SuppressWarnings( serial, unused )public class SwingRegister extends JFrame public SwingRegister() this.init();public void init() this.setTitle(用户注册);this.setBounds(100, 100, 340,600);/this.createUI();this.setVisible(true);this.setDefaultCloseOperation(EXIT_ON_CLOSE); JTextField nameTxt = new JTextField(); JPasswordField pwd = new JPasswordField(); JPanel panel = new JPanel();public void createUI() / 添加边框Border border = BorderFactory.createEtchedBorder(EtchedBorder.LOWERED);TitledBorder tBorder = BorderFactory.createTitledBorder(border, 注册面板,TitledBorder.CENTER, TitledBorder.TOP);panel.setBorder(tBorder);panel.setLayout(null);this.add(panel);/密码JLabel pwdLbl = new JLabel(输入密码:);pwdLbl.setBounds(10, 80, 60, 25);panel.add(pwdLbl);pwd.setBounds(80, 80, 120, 22);panel.add(pwd);/性别JLabel genderLbl = new JLabel(性别:);genderLbl.setBounds(10, 110, 60, 25);panel.add(genderLbl);ButtonGroup group = new ButtonGroup();JRadioButton fRdo = new JRadioButton(男, true);fRdo.setBounds(80, 110, 50, 25);group.add(fRdo);JRadioButton mRdo = new JRadioButton(女, false);mRdo.setBounds(140, 110, 50, 25);group.add(mRdo);panel.add(fRdo);panel.add(mRdo);/姓名JLabel nameLbl = new JLabel(输入姓名:);nameLbl.setBounds(10, 50, 60, 25);panel.add(nameLbl);/final JTextField nameTxt = new JTextField();nameTxt.setBounds(80, 50, 120, 22);panel.add(nameTxt);/学历JLabel ediLbl = new JLabel(学历:);ediLbl.setBounds(10, 140, 60, 25);panel.add(ediLbl);/下拉列表JComboBox edicbo = new JComboBox();edicbo.addItem(高中);edicbo.addItem(大专);edicbo.addItem(本科);edicbo.addItem(其它);edicbo.setBounds(80, 140, 80, 22);panel.add(edicbo);/爱好JLabel hobbyLbl = new JLabel(爱好:);hobbyLbl.setBounds(10, 170, 60, 25);panel.add(hobbyLbl);/复选框JCheckBox hobbyChk = new JCheckBox(睡觉);hobbyChk.setBounds(80, 170, 60, 25);panel.add(hobbyChk);JCheckBox hobbyChk2 = new JCheckBox(运动, true);hobbyChk2.setBounds(150, 170, 60, 25);panel.add(hobbyChk2);JCheckBox hobbyChk3 = new JCheckBox(爬山);hobbyChk3.setBounds(220, 170, 60, 25);panel.add(hobbyChk3);/自我介绍JLabel intrLbl = new JLabel(自我介绍:);intrLbl.setBounds(10, 200, 60, 25);panel.add(intrLbl);/Swing中,文本域默认是不带滚动条的,必须放置在JScrollPane中,才会滚动条JTextArea intrArea = new JTextArea();JScrollPane scrollPane = new JScrollPane(intrArea,JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);scrollPane.setBounds(20, 230, 240, 110);panel.add(scrollPane);/放置图片JLabel imgLbl = new JLabel();imgLbl.setBounds(5, 350, 324, 47);panel.add(imgLbl); Object url = this.getClass().getResource(149.gif);/Icon icon = new ImageIcon();imgLbl.setIcon(icon);/按钮JButton btn = new JButton( 提交 );btn.setBounds(50, 420, 70, 22);btn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent arg0) /* 参数1: 父组件 参数2: 提示信息 参数3: 标题信息 * 参数4: 指定按钮类型 参数5: 指定图标类型 * 返回值:用户所选选项的整数*/int option = JOptionPane.showConfirmDialog(null, 你确定提交吗?,提交提示, JOptionPane.OK_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE);if (option = JOptionPane.OK_OPTION) System.out.println(ok,submit!); else System.out.println(no, cancel););btn.addActionListener(new ActionListener() public void actionPerformed(ActionEvent arg0) String str1=姓名:;str1=str1+nameTxt.getText();str1=str1+密码:; str1=str1+pwd.getPassword().toString(); JTextField answerTxt = new JTextField();answerTxt.setBounds(80, 350,180, 22);answerTxt.setText(str1);panel.add(answerTxt););panel.add(btn);JButton btn2 = new JButton( 重置 );btn2.setBounds(150, 420, 70, 22);panel.add(btn2);btn2.addActionListener(new ActionListener() public void actionPerformed(ActionEvent arg0) /重置处理代码.);/JLabel answerLabel = new JLabel(个人信息);answerLabel.setBounds(10, 350,80, 25);panel.add(answerLabel); public static void main(String args) new SwingRegister(); 11.(1)创建一个文件并输出文件的相关信息(2) 在以上文件中写入I am a student!(3) 使用缓冲区技术完成以上操作import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;public class FileTest public static void main(String args) /1.创建一个文件并输出文件的相关信息 File file=new File(myText.txt);/创建文件 if(file.exists() file.delete(); else try file.createNewFile(); catch(Exception e) e.printStackTrace(); String name=file.ge