java实验答案

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[] args) {// 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(sum);}static int ji(int n){if(n==1)return 1;elsereturn ji(n-1)*n;}}习题2.6public class Test{public 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.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α，最后一个为ω）import java.applet.*;import java.awt.*;public class myapplet extends Applet{public void paint(Graphics g){String str="";for(char a='α';a<'ω';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。

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 Triangle{private 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,double 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 Rectangle{private double length;private 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;public class Circle{private 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.javapackage Test;import figure.Circle;import figure.Rectangle;import figure.Triangle;public class figureTest{public 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.println(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private 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, String 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;}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)return 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 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():" + 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());Teacher 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)}}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。