java实验答案

1、 实验一水仙花数：class shuixianhua/水仙花数public static void main(String arg)int i,a,a1,b,b1,c;for(i=100;i<1000;i+) a=i%10; a1=i/10; b=a1%10; b1=a1/10; c=b1%10; if(i=(a*a*a+b*b*b+c*c*c) System.out.println(i); 输出如下：153370371407打印出100以内素数：public class sushu /* * param args */public static void main(String arg

2、s) / TODO Auto-generated method stubint i,j,k=0;for(i=2;i<100;i+)if(i=2)System.out.println(i);i+;for(j=2;j<i;j+)if(i%j!=0)k=1;if(k=1)System.out.println(i);求1！+2！+20！public class jiecheng public static void main(String args) int i,sum=0,k;for(i=1;i<=20;i+)k=ji(i); sum=k+sum; System.out.print

3、(sum);static int ji(int n) if(n=1)return 1;else return ji(n-1)*n;习题2.6public class Testpublic static void main(String args)/第19题,打出图形.菱形 int n=3; for(int i=1;i<=n;i+) for(int k=n-1;k>=i;k-) System.out.print(" "); for(int j=1;j<=2*i-1;j+)/打印* System.out.print("*"); System

4、.out.println(); 编写程序，命令行窗口输出希腊字母表。（希腊字母表开始为，最后一个为）import java.applet.*;import java.awt.*;public class myapplet extends Applet public void paint(Graphics g) String str="" for(char a=''a<''a+) str+=a; g.drawString(str, 2, 10); 实验二设计一个名为figure的图形软件包（package）。包中包含三角形、矩形、圆三个类

5、。要求：（1）每个类都要构造方法并为成员设置get和set方法；（2）每个类都要有计算周长和面积的成员方法；（3）完成该软件包后的编码后，在另一个包的含有main方法的类中编写代码，分别使用图形软件包中的三个类，生成三个对象，并打印出其周长和面积。Triangle.javapackage figure;public class Triangleprivate double a,b,c; public Triangle(double x,double y,double z)a = x;b = y;c = z;public void get()public void set(double x,do

6、uble y,double z)a = x;b = y;c = z;public double Perimeter()double per = a + b + c; return per;public double Area()double area = 0;double p=(a+b+c)/2;double s = p*(p-a)*(p-b)*(p-c);area = (double)Math.sqrt(s);return area;Rectangle.javapackage figure;public class Rectangleprivate double length;private

7、 double width;public Rectangle(double l,double w)length = l;width = w;public void get()public void set(double l,double w)length = l;width = w;public double Perimeter()double per = 2*(length + width); return per;public double Area()double area = length * width;return area;Circle.javapackage figure;pu

8、blic class Circleprivate double r;private double PI = 3.14;public Circle(double x)r = x;public double get() return r;public void set(double x)r = x;public double Perimeter()double per = 2*(PI * r); return per;public double Area()double area = PI*(double)Math.pow(r,2);return area;figureTest.javapacka

9、ge Test;import figure.Circle;import figure.Rectangle;import figure.Triangle;public class figureTestpublic static void main(String args)Circle c =new Circle(3.2);System.out.println(c.Area();System.out.println(c.Perimeter();Rectangle r = new Rectangle(3,4);System.out.println(r.Area();System.out.printl

10、n(r.Perimeter();Triangle t = new Triangle(3,4,4);System.out.println(t.Area();System.out.println(t.Perimeter();编写类Factorial，为其添加两个静态方法（方法名自定义）。其中一个使用递归计算n的阶乘，一个使用非递归计算n的阶乘。构造main方法进行测试。public class Fac public static void main(String args) int n = 5;long fac = digui(n);long fac2 = nonDigui(n);/循环方法pri

11、vate static long nonDigui(int n) long fac = 1L;for(int i = 1; i<=n ;i+)fac = fac * i;return fac;/递归private static long digui(int n) if(n = 1)return 1;return n * digui(n-1);按照要求使用Java进行编码。1) 设计一个教师类Teacher，属性有编号（no）、姓名（name）、年龄（age）、所属学院（seminary），为这些属性设置相应的get和set方法；2) 为Teacher类添加方法equals；（当两个教师对

12、象的no相同时返回true）3) 为Teacher类添加方法toString，通过该方法可以返回“编号为*、姓名为*、年龄为*的*学院老师”形式的字符串。4) 构造main方法进行测试。Teacher.javapublic class Teacher public static int num; public int no; public String name; public int age; public String seminary; public Teacher() super(); public Teacher(int no, String name, int age, Strin

13、g seminary) super(); this.no = no; = name; this.age = age; this.seminary = seminary; public static int getNum() return num; public static void setNum(int num) Teacher.num = num; public int getAge() return age; public void setAge(int age) this.age = age; public String getName() return name;

14、 public void setName(String name) = name; public int getNo() return no; public void setNo(int no) this.no = no; public String getSeminary() return seminary; public void setSeminary(String seminary) this.seminary = seminary; public boolean equals(Object otherObject)if (otherObject = null)re

15、turn false; if (getClass() != otherObject.getClass()return false; Teacher other = (Teacher) otherObject; return no = other.no;public String toString()return "编号:" + getNo() + "姓名:" + getName() + "年龄:" + getAge()+ "学院老师:"+ getSeminary();-TestTeacher.javapublic

16、class TestTeacher public static void main(String args) Teacher t1 = new Teacher(1,"zhangsan",43,"计算机"); System.out.println(t1.getNo(); System.out.println(t1.getName(); System.out.println(t1.getAge(); System.out.println(t1.getSeminary(); System.out.println("t1.toString():&quo

17、t; + t1); t1.setName("wangwu"); t1.setAge(50); t1.setSeminary("国际经贸"); System.out.println(t1.getNo(); System.out.println(t1.getName(); System.out.println(t1.getAge(); System.out.println(t1.getSeminary(); Teacher.setNum(Teacher.getNum() + 1); System.out.println(Teacher.getNum(); T

18、eacher t2 = new Teacher(2,"lisi",44,"经管"); Teacher.setNum(Teacher.getNum() + 1); System.out.println(Teacher.getNum(); Teacher t3 = new Teacher(3,"zhouwu",45,"信息"); Teacher.setNum(Teacher.getNum() + 1); System.out.println(Teacher.getNum();System.out.println(t2)

19、设计一个带表头的单链表（链表中的元素属于同一类型对象，但对象的类型可以随意），提供以下操作：（1）insert：在某个位置插入对象；（2）delete：在某个位置删除对象；（3）delete：删除链表中与x相同的元素；（4）size：返回当前链表中对象的个数；（5）isEmpty：判断链表是否为空；（6）traverse：遍历链表，打印出所有的元素；（7）getData：取得某个位置的对象。构造main函数进行测试。public class Code private int data;private Code next;public int getData() return data;publ

20、ic void setData(int data) this.data = data;public Code getNext() return next;public void setNext(Code next) this.next = next;public class List public Code head;List()this.head=new Code();head.setData(0);List(int n)this.head=new Code();Code p,temp;p=head;for(int i=0;i<n;i+)temp=new Code();temp.set

21、Data(i+1);p.setNext(temp);p=p.getNext();head.setData(n);/判断是否为空public void IsEmptyList() if (this.head=NULL) System.out.println("空链表"); else System.out.println("非空");Public void I/遍历节点public void TraverseList()int Size=0;Code temp;temp=head;while(temp.getNext()!=null)Size+;temp=t

22、emp.getNext();System.out.println(temp.getData();System.out.println(Size);/删除节点public void DeleteCode(int n)if(n>head.getData()System.out.println("找不到第"+n+"个节点");return;Code temp;temp=head;for(int i=0;i<n-1;i+)temp=temp.getNext();temp.setNext(temp.getNext().getNext();head.se

23、tData(head.getData()-1);/插入节点public void InsertCode(int n,int d)if(n>head.getData()+1)System.out.println("找不到第"+n+"个节点");return;Code p=new Code();p.setData(d);Code temp;temp=head;for(int i=0;i<n-1;i+)temp=temp.getNext();p.setNext(temp.getNext();temp.setNext(p);public static

24、 void main(String args)List l=new List(5);l.rList();l.iCode(3,8);l.rList();l.dCode(4);l.rList(); 实验三1、按照要求使用Java进行编码。1) 编写一个抽象类Shape，其中有抽象方法getArea（）和getPerimeter（）2) 在Shape类的基础上派生出Rectangle和Circle类，二者都实现了计算面积的方法getArea（）和计算周长的方法getPerimeter（）；构造main函数，生成Rectangle和Circle对象，并用Shape类型的变量调用Rectangle和Ci

25、rcle对象的getArea（）和getPerim（）方法。Shape.Javaimport java.io.*;public class Shape /* * param args * author * date Dec 4 */public static void main(String args) throws IOException float radius ; / 定义圆的周长 float a,b,c; / 定义三角形的三边长 float w,h; / 定义矩形的宽和长 int select; / 功能选项序号 BufferedReader buf = new BufferedRea

26、der(new InputStreamReader(System.in); String str; Graphics gp; while(true)/ 控制程序循环 PrintMenu(); while(true) str=buf.readLine(); try if(str.length()>1 | str.charAt(0)>52 | str.charAt(0)<48) System.out.print("输入不合法！请输入（0-3）的整数: "); continue; select=Integer.parseInt(str); while(selec

27、t > 3 | select <0) System.out.print("输入不合法！请输入（0-3）的整数: "); continue; break; catch(Exception ne) System.out.print("输入的不是（0-3）之间的整数,请重新输入: "); continue; switch(select)/ 处理用户要执行的功能 case 1: / 处理圆的情况 System.out.println("请输入圆的半径: "); while(true) try str=buf.readLine();

28、 radius = Float.parseFloat(str); /Circle circle =new Circle(radius); if(radius<=0) System.out.print("圆的半径应为大于0的实数,请重新输入圆的半径: "); continue; System.out.println("圆的半径为： " + radius); gp = new Circle(radius); gp.area(); gp.perimeter(); break;/ 退出循环 catch( NumberFormatException ne)

29、System.out.println("输入的数据不合要求!n请重新输入圆的半径: "); continue; break; case 2: / 处理矩形的情况 System.out.println("请输入矩形的长和宽"); while(true) try System.out.print("输入矩形的长 : "); str=buf.readLine(); w=Float.parseFloat(str); System.out.print("输入矩形的宽 : "); str=buf.readLine(); h=F

30、loat.parseFloat(str); if(w<=0) | (h<=0) System.out.print("输入的数据不符合要求!请重新输入矩形的长和宽: "); continue; / Rectangle rect=new Rectangle(w,h); gp = new Rectangle(w,h); System.out.println("矩形的长和宽为: " + w + "t" + h); gp.area(); gp.perimeter(); break; / 退出循环 catch(Exception ne

31、) System.out.print("输入的数据不符合要求!请重新输入矩形的长和宽: "); break; case 3:/ 处理三角形的情况 while(true) try System.out.println("请输入三角形的三边长"); System.out.print("输入a : "); str=buf.readLine(); a=Float.parseFloat(str); System.out.print("输入b : "); str=buf.readLine(); b=Float.parseFlo

32、at(str); System.out.print("输入c : "); str=buf.readLine(); c=Float.parseFloat(str); if(!(a+b>c && a+c>b && b+c>a)/ a,b,c不能构成三角形的情况，要求重新输入 System.out.print("您输入的三边不能构成三角形!请重新输入三角形的三边长: "); continue; /输入的三边长可以构成三角形的情况，计算并输出在不久的三角形的面积和周长 / Triangle tri = new T

33、riangle(a,b,c); System.out.println("三角形的三边长分别为: " + a + "t" + b + "t" + c); gp = new Triangle(a,b,c); gp.area(); gp.perimeter(); break;/ 退出循环 catch(Exception ne) /出现异常的处理操作 System.out.print("输入的数据不符合要求!请重新输入三角形的三边长: "); break; case 0: /退出 System.out.println(&q

34、uot;感谢使用!"); System.exit(0); /end of switch /end of while 程序循环/ end of main()public static void PrintMenu() System.out.println("t操作菜单");System.out.println("1、求圆的面积和周长");System.out.println("2、求矩形的面积和周长");System.out.println("3、求三角形的面积和周长");System.out.printl

35、n("0、退出");System.out.print("请选择要执行的操作: "); /end of PrintMenu()/end of classRectangle.javapackage exp015S1_2;public class Rectangle implements Graphics /* * param args */ float weight,height; public Rectangle(float w,float h) weight=w; height=h; /求面积 public void area() System.out.

36、println("面积为: "+ weight*height); public void perimeter() System.out.println("周长为: "+ 2*weight*height); Circle.javapackage exp015S1_2;public class Circle implements Graphics/* * param args */ float radius; / 定义圆的周长 /Circle类的构造函数 public Circle(float r) radius = r; /求面积 public void

37、area() System.out.println("面积为: "+ Math.PI*radius*radius); /求周长 public void perimeter() System.out.println("周长为: "+ 2*Math.PI*radius); Graphics.javapackage exp015S1_2;/* * author Administrator * */public interface Graphics abstract void area(); /求图形面积方法abstract void perimeter();

38、/求图形周长方法2、以电话为父类，移动电话和固定电话为两个子类，并使移动电话实现接口：可移动。固定电话又有子类：无绳电话。定义接口及各类，明确他们的继承关系。package edu.sdust.sc;public interface Motive package edu.sdust.sc;abstract class Phoneabstract void call();class MobilePhone extends Phone implements Motivepublic void call()class Telephone extends Phonepublic void call()

39、class NotThreadPhone extends Telephonepublic void call()public class PhoneImpl public static void main(String args)3、在实验2中所实现的Teacher类的基础上，修改Teacher类的代码，要求：由多个Teacher对象所形成的数组可以使用Arrays.sort方法进行排序（编号由低到高排序）。public class Teacherprivate int no;private String name;private int age;private String seminary

40、;public Teacher(int n, String na, int a, String s)no = n;name = na;age = a;seminary = s; public int getNo()return no; public int getAge()return age; public String getName()return name; public String getSeminary()return seminary;Public void setNo(int no)this.no=no;Public void setName(String name)=name;Publi