编程期末复习

1、编程题：1编写一个输出Hello World！的程序，用两种方式实现（Application、Applet）。application程序public class apublic static void main(String args)System.out.println(Hello World!);2、applet程序public class b extends java.applet.Appletpublic paint(java.awt.Graphics g)g.outstring(Hello World!,10,10);2.求10个数中的最小值并输出。import java.util.

2、Scanner;public class Test public static void main(String args)int num=new int10;int min;Scanner scan=new Scanner(System.in);System.out.print(请输入10个数字:);for(int i=0; i10; i+)numi=scan.nextInt();min=num0;for(int i=1; inumi) min=numi;System.out.println(最小值是+min);3.建立一个学生类，其中成员变量为学号，姓名，及三门课成绩。另外建立一个包含主方

3、法的类，定义2个学生类的对象，求出这2个学生三门课总分的最高分，并将最高分这个学生的信息输出。class student String name,no; float eng,math,chi; public student(String name1,String no1,float eng1,float math1,float chi1)name=name1;no=no1;eng=eng1;math=math1;chi=chi1;float sum() return(eng+math+chi);void print() System.out.println(name:+name+t no:+n

4、o+t total:+sum();public class maxpublic static void main(String args)student s1=new student(lily,001,80,90,50);student s2=new student(lucy,002,70,70,70);if (s1.sum()s2.sum() s1.print();else s2.print();4请编写一个实现如下功能的Application：比较从键盘输入的两个整数是否相等，并根据比较结果显示“相等”或“不相等”。import java.util.Scanner;public class

5、 COMPare public static void main(String args )Scanner tr=new Scanner(System.in);int b=tr.nextInt();int a=tr.nextInt();if(a=b) System.out.println(相等);else System.out.println(不相等);5.编写一个Application,利用数组求出”HELLO”,”JAVA”PROGRAM”三个字符串的平均长度。class Average public static void main(String args) String array =

6、 new String3;array0 = HELLO;array1 = JAVA;array2 = PROGRAM;int total = array0.length();total += array1.length();total += array2.length();System.out.println(平均字符串长度为： + total/3);6、习题(6_13)： import java.util.*;class StudentString num;String name;String sex;boolean cleader;float math;float chn;float en

7、g;public Student(String newNum,String newName,String newSex,boolean newCleader,float newMath,float newChn,float newEng)num=newNum;name=newName;sex=newSex;cleader=newCleader;math=newMath;chn=newChn;eng=newEng;public float sum()return math+chn+eng;public float ave()return sum()/3;public void output()S

8、ystem.out.println(num+t+name+t+sex+t+cleader+tt+math+t+chn+t+eng+t+sum()+t+ave();public class book6_13_2public static void main(String args)String newNum,newName,newSex;boolean newCleader;float newMath,newChn,newEng;Student s=new Student3;for(int i=1;i=s.length;i+)System.out.println(请输入第+i+个学生的信息);S

9、canner reader=new Scanner(System.in);System.out.print(请输入该学生学号：);newNum=reader.nextLine();System.out.print(请输入该学生姓名：);newName=reader.nextLine();System.out.print(请输入该学生性别：);newSex=reader.nextLine();System.out.print(请输入该学生是否为班干部：);newCleader=reader.nextBoolean();System.out.print(请输入该学生数学成绩：);newMath=r

10、eader.nextFloat();System.out.print(请输入该学生语文成绩：);newChn=reader.nextFloat();System.out.print(请输入该学生英语成绩：);newEng=reader.nextFloat();si-1=new Student(newNum,newName,newSex,newCleader,newMath,newChn,newEng);System.out.println(学号t姓名t性别t班干部否t数学t语文t英语t总分t平均分);for(int i=1;i=s.length;i+)si-1.output();7、/第5章第

11、11题import java.io.*;public class Exercises5_11 public static void main(String args) throws IOException String str; BufferedReader buf; buf=new BufferedReader(new InputStreamReader(System.in); System.out.print(请输入字符串，输入exit退出：); do str=buf.readLine(); System.out.println(str); while(!str.equals(exit);

12、 8、定义一个Person类，该类具有姓名、身高、体重、年龄属性，能够对上述相关信息进行输出display()。由Person类派生出China类，增加爱好属性。.class Person private String name; private int age; private float hight; private float weight; public Person(String n,int a,float h,float w) name=n; age=a; hight=h; weight=w; public void show() System.out.println(Person

13、 name =+name +,age= + age + , hight= + hight + , weight= + weight + ); class China extends Person private String hobby; public China(String n,int a,float h,float w,String hob)super(n,a,h,w); hobby=hob; public void display() System.out.println( China hobby= + hobby + ); public class E8_1 public stati

14、c void main(String args) China cc =new China(wenwen,23,168,104,sing); cc.show(); cc.display(); 9、创建一个图形类，包括计算图形面积的方法。创建两个子类长方形、圆形，分别继承图形类，重写子类中的计算图形面积的方法。写一个测试类，分别创建一个长方形和圆形类的对象，并且分别计算这两个图形的面积./filename：app8_2.java 抽象类的说明abstract class Shape protected String name; public Shape(String xm) name=xm; Sy

15、stem.out.print(名称：+name); abstract public double getArea();class Circle extends Shape private final double PI=3.14; private double radius; public Circle(String shapeName,double r) super(shapeName); radius=r; public double getArea() return PI*radius*radius; class Rectangle extends Shape private doubl

16、e width; private double height; public Rectangle(String shapeName,double width,double height) super(shapeName); this.width=width; this.height=height; public double getArea() return width*height; public class E8_2 public static void main(String args) Shape rect =new Rectangle(长方形,6.5,10.3); System.ou

17、t.println(；面积=+rect.getArea(); Shape circle=new Circle(圆,10.2); System.out.println(；面积=+circle.getArea(); 10、编写一个“Student”类，该类拥有属性：校名、学号、性别、出生日期。方法包含构造方法和输出方法。再编写“Student”类的子类：Undergraduate（大学生）。Undergraduate类除拥有父类属性和方法外，还有其自己的属性和方法：附加属性包括系（department）、专业(major)；方法包含构造方法和输出方法。class Student String na

18、me; int sNum; String sex; String birth; String sname; int Score; public Student(String name1,int sNum1, String sex1,String birth1, String sname1,int Score1) name=name1; sNum=sNum1; sex=sex1; birth=birth1; sname=sname1; Score=Score1; void show() System.out.println(所在学校：+name); System.out.println(学号：+

19、sNum); System.out.println(性别：+sex); System.out.println(生日：+birth); System.out.println(姓名：+sname); System.out.println(成绩：+Score); class Undergraduate extends Student String department; String major; public Undergraduate(String name1,int sNum1, String sex1,String birth1, String sname1,int Score1,Strin

20、g department1,String major1) super(name1,sNum1,sex1, birth1, sname1, Score1); department=department1; major=major1; void show1() super.show(); System.out.println(系部：+department); System.out.println(专业：+major); public class aa public static void main(String arg) Undergraduate B=new Undergraduate(湖南*学

21、院,男,1988/08/08,许翼,95,信息工程系,计算机网络); B.show1(); 11、按以下要求编写程序(1) 编写Animal接口，接口中声明run() 方法(2) 定义Bird类和Fish类实现Animal接口(3) 编写Bird类和Fish类的测试程序，并调用其中的run()方法Bird类的run()方法输出鸟儿在飞.Fish类的run()方法输出鱼儿在游.解答：public interface Animal void run();class Bird implements Animal public void run() System.out.println(鸟儿在飞.);

22、class Fish implements Animal public void run() System.out.println(鱼儿在游.);public class TestAnimal public static void main(String args) Bird bird = new Bird();bird.run();Fish fish = new Fish();fish.run();12、按以下要求编写程序(1) 创建一个Rectangle类，添加width和height两个成员变量(2) 在Rectangle中添加两种方法分别计算矩形的周长和面积(3) 编程利用Rectan

23、gle输出一个矩形的周长和面积public class Rectangle float width, height;public Rectangle(float width, float height) this.width = width;this.height = height;public float getLength()return (this.width + this.height) * 2;public float getArea()return this.width * this.height;public static void main(String args) Recta

24、ngle rect = new Rectangle(10, 20);System.out.println(周长是： + rect.getLength();System.out.println(面积是： + rect.getArea();13、由person类派生出student类和teacher类import java.io.*;import java.util.*;class personprivate String name,sex,birth;public person(String n1, String s1, String b1)name=n1;sex=s1;birth=b1;voi

25、d display()System.out.println(name: +name+nSex: +sex+nbirthday: +birth);class student extends personprivate String cl;private int no;private float total; public student(String c,int num,float to,String n2,String s2,String b2) super(n2,s2,b2); cl=c; no=num; total=to;void displays()System.out.println(

26、-Display-nThe students );display();System.out.println(Class: +cl+nNo: +no+nTotal score: +total);class teacher extends personprivate String dp;private float wage; public teacher(String d,float w,String n2,String s2,String b2) super(n2,s2,b2); dp=d; wage=w;void displayt()System.out.println(-Display-nT

27、he teachers );display();System.out.println(Department profession:+dp+nWage:+wage);public class sttry public static void main(String args) throws IOException String n2,s2,b2,c,d;int num,ch;float to,w; Scanner reader=new Scanner(System.in); BufferedReader buf; buf=new BufferedReader(new InputStreamRea

28、der(System.in);while(true)System.out.println(-Meun-n1.Input studentn2.Input teachern3.ExitnEnter:);ch=reader.nextInt();switch(ch)case 1:System.out.println(-Input-);System.out.print(Input students name:);/n2=reader.next(); n2=buf.readLine(); System.out.print(Input sex:);s2=reader.next();System.out.pr

29、int(Input birthday:);b2=reader.next();System.out.print(Input class:);c=reader.next();System.out.print(Input No:);num=reader.nextInt();System.out.print(Input total score:);to=reader.nextFloat();student obj1=new student(c,num,to,n2,s2,b2);obj1.displays();break;case 2:System.out.println(-Input-);System

30、.out.print(Input teachers name:);/n2=reader.next(); n2=buf.readLine(); System.out.print(Input sex:);s2=reader.next();System.out.print(Input birthday:);b2=reader.next();System.out.print(Input department profession:);d=reader.next();System.out.print(Input wage:);w=reader.nextFloat();teacher obj2=new t

31、eacher(d,w,n2,s2,b2);obj2.displayt();break;case 3:System.exit(0);default:System.out.println(Error!Please enter again!);14、设计一个窗口，在窗口中摆放两个按钮，若按钮被点击了，就将该按钮上的标记改为“已按过”。/e1.java 简单的事件处理程序（已加入事件处理）import java.awt.*; import javax.swing.*;import java.awt.event.*;public class e1 extends JFrame implements Ac

32、tionListener static e1 frm=new e1(); static Button b1=new Button(button1); static Button b2=new Button(button2); public static void main(String args) b1.addActionListener(frm); /把监听者frm向事件源b1注册 b2.addActionListener(frm); /把监听者frm向事件源b2注册 frm.setTitle(操作事件); frm.setLayout(new FlowLayout(); frm.setSiz

33、e(260,170); frm.add(b1); frm.add(b2); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) if (e.getSource()=b1) b1.setLabel(已按过); else b2.setLabel(已按过); 15、设计一个窗口，其中包含两个标签（一个用于给出提示信息，另一个用来输出结果）和一个文本框。要求从文本框中获取用户给出的一个整数，并将该数的绝对值在第二个标签上输

34、出。 /e2.java 简单的事件处理程序（已加入事件处理）import java.awt.*; import javax.swing.*;import java.awt.event.*;public class e2 extends JFrame implements ActionListener static e2 frm=new e2(); static JButton b1=new JButton(提交); static JLabel l1=new JLabel(请输入一个整数); static JLabel l2=new JLabel(显示结果); static JTextField

35、 t1=new JTextField(10); public static void main(String args) b1.addActionListener(frm); /把监听者frm向事件源b1注册 / frm.setTitle(操作事件); frm.setLayout(null); frm.setSize(460,370); l1.setBounds(20,10,100,25); t1.setBounds(140,10,170,25); l2.setBounds(20,30,170,25); b1.setBounds(70,135,150,25); frm.add(b1); frm

36、.add(l1); frm.add(l2); frm.add(t1); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) int x=Integer.parseInt(t1.getText(); l2.setText(Math.abs(x)+ ); 16、13-6/第13章第6题import java.awt.*;import javax.swing.*;import java.awt.event.*;impor

37、t java.awt.Rectangle;public class Exercises13_6 extends JFrame implements ActionListener static Exercises13_6 frm = new Exercises13_6(); static JButton b1 =new JButton(); static int i=0; public static void main(String args) b1.addActionListener(frm); /把监听者frm向事件源b1注册 frm.setSize(300, 200); frm.setTi

38、tle(JFrame); frm.add(b1); b1.setBounds(new Rectangle(71, 40, 147, 49); b1.setText(开始点击); frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frm.setVisible(true); public void actionPerformed(ActionEvent e) i+; b1.setText(被点击+i+次); 17、Lab68/copy.java 简单的事件处理程序（已加入事件处理）import java.awt.*; ;import javax

39、.swing.*;import java.awt.event.*;public class copy implements ActionListener JButton b; JTextField L,R; public void display() JFrame f=new JFrame(); f.setSize(400,150); f.setBackground(Color.lightGray); f.setLayout(new FlowLayout(FlowLayout.LEFT); L=new JTextField(10); R=new JTextField(10); b=new JButton(复制); f.add(L); f.add(R); f.add(b); b.addActionListener(this); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true); public void actionPerformed(Actio