期末复习JAVA题

1、1. 分解质因数 package d2;import java.util.Scanner;public class Zys public static void main(Stringargs)Scanner sc=new Scanner(System.in);System.out.print("请输入一个数：");int a=sc.nextInt();int n=2;System.out.println(a+"=");while(a>=n)if(a%n=0)System.out.print(n+"*");a=a/n;if(a%

2、n!=0)n+;2. 判断是否是回文数 ackage c2;import java.util.Scanner;public class huiwenshu public static void main(Stringargs)/System.out.println("请输入一个数");Scanner a=new Scanner(System.in);System.out.println("请输入一个数");String b=a.nextLine();boolean c=false;for(int i=0;i<b.length();i+)if(b.c

3、harAt(i)!=b.charAt(b.length()-i-1)c=false;elsec=true;if(c=true)System.out.println("是回文数");elseSystem.out.println("不是回文数")3. 数组逆序输出public class sz public static void main(Stringargs)int a=1,2,3,4,5,6,7,8,9,0;for(int i=9;i>=0;i-)System.out.println(ai);4. 水仙花数public class sxh pub

4、lic static void main(Stringargs)int a,b,c;for(int i=100;i<=999;i+)a=i/10%10;b=i%10;c=i/100;if(i=a*a*a+b*b*b+c*c*c)System.out.println(i);5. 素数public class Sushu public static void main(String args)for(int i=100;i<=200;i+)boolean b=false;for(int j=2;j<=Math.sqrt(i);j+ )if(i%j=0) b=true;break;

5、elseb=false;if (b=false)System.out.println(i);6最大公约数和最小公倍数import java.util.Scanner;public class Sz public static void main(String args) int a, b, m;Scanner s = new Scanner(System.in);System.out.print("键入一个整数： ");a = s.nextInt();System.out.print("再键入一个整数： ");b = s.nextInt();deff c

6、d = new deff();m = cd.deff(a, b);int n = a * b / m;System.out.println("最大公约数: " + m);System.out.println("最小公倍数: " + n);class deff public int deff(int x, int y) int t;if (x < y) t = x;x = y;y = t;while (y != 0) if (x = y)return x;else int k = x % y;x = y;y = k;return x;1、题目：一个数

7、如果恰好等于它的因子之和，这个数就称为 "完数 "。例如6=123.编程     找出1000以内的所有完数。 public class shishu public static void main(String args) int i;for (i = 2; i <= 1000; i+) int sum = 0;for (int j = 1; j <=i/2; j+) if (i % j = 0) / System.out.println(j);sum = sum + j;if (sum = i) System

8、.out.println(i); 2. 假如我们在开发一个系统时需要对员工进行建模，员工包含3个属性：姓名、工号以及工资。经理也是员工，除了含有员工的属性外，另外还有一个奖金属性。请使用继承的思想设计出员工类和经理类。要求类中提供必要的方法进行属性访问。public class manager extends ygprotected int award;public static void main(Stringargs)yg a=new yg();a.setdata("张晓晓","01234",5000);a.print();manager

9、b=new manager();b.setdata("黄洋洋","01235",6000);b.award=20000;b.print();System.out.println("奖金"+b.award);class yg protected String name;protected String num;protected int salary;void setdata(String xm,String gh,int gz)name =xm;num=gh;salary=gz;public void print()System.ou

10、t.println("姓名："+name);System.out.println("工号"+num);System.out.println("工资"+salary);3. 以点类作为基类，从点派生出圆，从圆派生圆柱，设计成员函数输出它们的面积和体积。package third;public class Circle extends pointprotected int r;Circle(int r,int x,int y)super(x,y);this.r=r;public double area()return 3.14*r*r;p

11、ackage third; public class Cyliner extends Circle protected int h;Cyliner(int h,int x,int y,int r)super(x,y,r);this.h=h;public double volume()return area()*h;public static void main(Stringargs)Circle a=new Circle(2,2,4);Cyliner b=new Cyliner(2,2,3,4);System.out.println("圆的面积是："+a.area();Sy

12、stem.out.println("圆的体积是："+b.volume();public class point protected int x;protected int y;point()this.x=0;this.y=0;point(int x,int y)this.x=x;this.y=y;4.定义一个抽象基类Shape，它包含三个抽象方法center()、diameter()、getArea()，从Shape类派生出Square和Circle类，这两个类都用center()计算对象的中心坐标，diameter()计算对象的外界圆直径，getArea()方法计算对象的

13、面积。编写编写应用程序使用Rectangle类和Circle类。package W1;public abstract class Shape abstract void center();abstract void diameter();abstract void getArea();package W1;public class Square extends ShapeOverridevoid center() Overridevoid diameter() Overridevoid getArea() package W1;public class Circle extends Shape

14、Overridevoid center() Overridevoid diameter() Overridevoid getArea() package W1;public class Rectangle extends Squarepackage W1;public class Test public static void main(String args)Circle c = new Circle();Square r = new Rectangle();c.center();c.diameter();c.getArea();r.center();r.diameter();r.getAr

15、ea();实现一个名为Person的类和它的子类Employee， Manager是Employee的子类，设计一个接口Add用于涨工资，普通员工一次能涨10，经理能涨20。具体要求如下：（1）Person类中的属性有：姓名name（String类型），地址address（String类型）并写出该类的构造方法；（2）Employee类中的属性有：工号ID（String型），工资wage（double类型），工龄（int型），写出该类的构造方法；（3）Manager类中的属性有：级别level（String类型），写出该类的构造方法；public class person priva

16、te String name; private String address; public person(String name2, String address2) public void Person(String n,String a) this.setName(n); this.setAddress(a); public void setName(String n) = n; public void setAddress(String a) this.address = a; private String getName() return ; p

17、rivate String getAddress() return this.address; lass Empolyee extends person private int employeeNo; private double pay; private int age; public Empolyee(String name,String address,int empolyeeNO, double pay,int age) super(name,address); this.setEmployeeNo(empolyeeNO); this.setPay(pay); this.setAge(

18、age); public void setEmployeeNo(int e) this.employeeNo = e; public void setPay(double p) this.pay = p; public void setAge(int a) this.age = a; public int getEmployeeNo() return this.employeeNo; public double getPay() return this.pay; public int getAge() return this.age; class Manager extends Empolye

19、e private int level; public Manager(String name,String address,int empolyeeNO,double pay, int age,int level) super(name,address,empolyeeNO,pay,age); this.setLevel(level); public void setLevel(int l) this.level = l; public int getLevel() return this.level; public void printInfo() System.out.println(&

20、quot;姓名："+this.getName()+",工号："+this.getEmployeeNo() +",工龄："+this.getAge()+",级别："+this.getLevel() +",地址："+this.getAddress(); System.out.println("原工资："+this.getPay(); System.out.println("涨工资后的工资："+new Add().addPay(this.getLevel(), this.

21、getPay(); private String getAddress() return null;private String getName() return null; class Add public double addPay(int level,double pay) if(level=0) pay = (1+0.1)*pay; else if(level=1) pay = (1+0.2)*pay; else System.out.println("级别只能为0或1，0表示普通员工，1则表示经理，操作无效！"); return pay; public class

22、 ExtendsDemo public static void main(String args) Manager m1 = new Manager("张三","南京路",0001,2000,10,0); Manager m2 = new Manager("李四","长江路",0002,3000,15,1); m1.printInfo(); System.out.println("*"); m2.printInfo(); 编写一个测试类，产生一个员工和一个经理并输出其具有的信息。1.定义一个接口

23、Assaultable(可攻击的)，该接口有一个抽象方法attack()。2.定义一个接口Mobile（可移动的）,该接口有一个抽象方法move()。3.定义一个抽象类Weapon,实现Assaultable接口和Mobile接口，但并没有给出具体的实现方法。4.定义3个类：Tank,Flighter,WarShip都继承自Weapon,分别用不同的方式实现Weapon类中的抽象方法。5.写一个类Army,代表一支军队，这个类有一个属性是Weapon数组w（用来存储该军队所拥有的所有武器）；该类还提供一个构造方法，在构造方法里通过传一个int类型的参数来限定该类所能拥有的最大武器数量,并用这一

24、大小来初始化数组w。该类还提供 一个方法addWeapon(Weapon wa),表示把参数wa所代表的武器加入到数组w中。在这个类中还定义两个方法attackAll()和moveAll()，让w数组中的所有武器攻击和移动。6.写一个主方法去测试以上程序。class Army private Weapon w = null; private int size = 0; private Army() public Army(int i) w = new Weaponi; public void addWeapon(Weapon weapon) if (size >= w.length) S

25、ystem.out.println("军队装备足够了!"); return; else wsize = weapon; size+; public void attacAll() for (Weapon wea : w) if (wea != null) wea.attack(); public void moveAll() for (Weapon wea : w) if (wea != null) wea.move(); package A1;class Flighter extends Weapon public void attack() System.out.pri

26、ntln("Flighter attacks"); public void move() System.out.println("Flighter moves"); public class NotSimple public static void main(String args) Army a = new Army(3); a.addWeapon(new Tank(); a.addWeapon(new Flighter(); a.addWeapon(new WarShip(); a.attacAll(); a.moveAll(); interface

27、 Assaultable abstract public void attack();interface Mobile abstract public void move();abstract class Weapon implements Assaultable, Mobile class Tank extends Weapon public void attack() System.out.println("Tank attacks"); public void move() System.out.println("Tank moves"); pac

28、kage A1;class WarShip extends Weapon public void attack() System.out.println("WarShip attacks"); public void move() System.out.println("WarShip moves"); class Army private Weapon w = null; private int size = 0; private Army() public Army(int i) w = new Weaponi; public void addWea

29、pon(Weapon weapon) if (size >= w.length) System.out.println("军队装备足够了!"); return; else wsize = weapon; size+; public void attacAll() for (Weapon wea : w) if (wea != null) wea.attack(); public void moveAll() for (Weapon wea : w) if (wea != null) wea.move(); package A1;class Flighter exten

30、ds Weapon public void attack() System.out.println("Flighter attacks"); public void move() System.out.println("Flighter moves"); package A1;public class NotSimple public static void main(String args) Army a = new Army(3); a.addWeapon(new Tank(); a.addWeapon(new Flighter(); a.addWe

31、apon(new WarShip(); a.attacAll(); a.moveAll(); interface Assaultable abstract public void attack();interface Mobile abstract public void move();abstract class Weapon implements Assaultable, Mobile package A1; class Tank extends Weapon public void attack() System.out.println("Tank attacks")

32、; public void move() System.out.println("Tank moves"); package A1;class WarShip extends Weapon public void attack() System.out.println("WarShip attacks"); public void move() System.out.println("WarShip moves"); 一个公司有2辆小汽车(car)，一辆公共汽车(bus)，其中：第一小辆汽车每天跑300公里；第二辆小汽车每天跑400公

33、里；公共汽车每天跑500公里，已知小汽车每百公里耗油量为7升，公共汽车每百公里耗油量为10升，用接口编程计算每天所有交通工具的耗油量。public interface Vehicle int getfuel();import c1.Vehicle;public class bus implements Vehicle int kil;bus(int k1)kil=k1;public int getfuel()return(10*kil/100);import c1.Vehicle;class car implements Vehicle int kil; car(int k1)kil=k1;p

34、ublic int getfuel()return(7*kil/100);import c1.bus;import c1.car;import pany1;import c1.Vehicle;public class company1 Vehicle a;company1()a=new Vehicle3;a0=new car(300);a1=new bus(500);a2=new car(400);int rf()int i=0;for(i=0;i<a.length;i+)i=i+ai.getfuel();return (i);public static void main(String

35、args)company1 c=new company1();System.out.println("sum="+c.rf();编写创建一个box类，在其中定义三个变量表示一个立方体的长、宽和高，定义一个构造方法对这三个变量进行初始化，然后定义一个方法求立方体的体积。创建一个对象，求给定尺寸的立方体的体积。public class Box double length;double wide;double high;Box(double l,double w,double h)this.length=l;this.wide=w;this.high=h;public void

36、volume()double v;v=length*wide*high;System.out.println("box的体积是："+v);public class Test public static void main(Stringargs)Box a=new Box(2,2,3);a.volume();定义一个学生类student，属性包括学号、班号、姓名、性别、年龄、班级总人数；方法包括获得学号、获得班号、获得姓名、获得性别、获得年龄、获得班级总人数、修改学号、修改班号、修改姓名、修改性别、修改年龄、以及一个tostring（）方法将student类中的所有属性组合成

37、一个字符串。定义一个学生数组对象。设计程序进行测试。public class Student private String num;private String grade;private String name;private String sex;private int age;private int count ;Student(String nu,String gr,String na,String se,int ag,int co) this.num=nu; this.grade=gr;=na;this.sex=se; this.age=ag; this.count

38、=co;public String getNum() return num;public void setNum(String num) this.num = num;public String getGrade() return grade;public void setGrade(String grade) this.grade = grade;public String getName() return name;public void setName(String name) = name;public String getSex() return sex;publ

39、ic void setSex(String sex) this.sex = sex;public int getAge() return age;public void setAge(int age) this.age = age;public int getcount() return count;public void setcount(int count) this.count = count;public String toString()return "学号"+num+"班号"+grade+"姓名"+name+"性

40、别"+sex+"年龄"+age+"班级总人数"+count;public class Test3 public static void main(Stringargs)Student s=new Student2; s0=new Student("130813125","信管131","张晓晓","女",20,34); s1=new Student("130813126","信管131","小高密",&qu

41、ot;女",20,34); for(int i=0;i<2;i+) System.out.println(si.toString(); 设计一个人员类person，其中包含一个方法pay，代表人员的工资支出。再以person类派生出教师类teacher和大学生类collegestudent其中：教师：工资支出=基本工资+授课时数*30大学生：奖学金支出将人员类定义为抽象类，pay为抽象方法，设计程序实现多态性。public abstract class Person public abstract void pay(int a,int b);public abstract vo

42、id pay();public class CollegeStudent int award;public void pay(int w)this.award=w;System.out.println("CollegeStudent的奖学金支出是："+award);public class Teacher extends Personint wage;int time;int p;public void pay(int w,int t)this.wage=w;this.time=t;p=wage+time*30;System.out.println("Teache

43、r的工资支出是："+p);Overridepublic void pay() / TODO Auto-generated method stubpublic class Test2 public static void main(Stringargs)Teacher a=new Teacher();CollegeStudent b=new CollegeStudent();a.pay(5000,50);b.pay(3000);1 将1100之间的所有正整数在放在一个List集合中，并将集合中索引位置是10的对象从集合中移除。import java.util.*;public clas

44、s Test public static void main(String args) List list1 = new ArrayList();for (int i = 1; i <= 100; i+) list1.add(i);list1.remove(10);Iterator it = list1.iterator();while (it.hasNext() System.out.println(it.next();2.分别向Set集合以及List集合中添加“A”、“a”、“c”、”C”、”a”5个元素，观察重复值能否在List集合以及Set集中成功添加。import java.u

45、til.ArrayList;import java.util.HashSet;import java.util.List;import java.util.Set;public class Test2 public static void main(String args) Set set=new HashSet(); set.add("A"); set.add("a"); set.add("c"); set.add("C"); set.add("a"); System.out.println(

46、set); List list1=new ArrayList();list1.add("A");list1.add("a");list1.add("c");list1.add("C");list1.add("a");System.out.println(list1)3. （List）已知有一个Worker 类如下：public class Worker private int age;private String name;private double salary;publ

47、ic Worker ()public Worker (String name, int age, double salary) = name;this.age = age;this.salary = salary;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 double getSalary(

48、)return salary;public void setSalary(double salary)this.salary = salary;public void work()System.out.println(name + “ work”);完成下面的要求1) 创建一个List，在List 中增加三个工人，基本信息如下：姓名 年龄 工资zhang3 18 3000li4 25 3500wang5 22 32002) 在li4 之前插入一个工人，信息为：姓名：zhao6，年龄：24，工资33003) 删除wang5&#

49、160;的信息4) 利用for 循环遍历，打印List 中所有工人的信息5) 利用迭代遍历，对List 中所有的工人调用work 方法。 package z3;public class Worker private int age;private String name;private double salary;public Worker ()public Worker (String name, int age, double salary) = name;this.age = age;this.sal

50、ary = salary;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 double getSalary()return salary;public void setSalary(double salary)this.salary = salary;public void work()System.out.pr

51、intln(name+"work"); package z3;import java.util.ArrayList;import java.util.Iterator;import java.util.List;public class Test3 public static void main(String args) Worker w1=new Worker("zhang3",18,3000);Worker w2=new Worker("li4",25,3500);Worker w3=new Worker("wang5&

52、quot;,18,3000);Worker w4=new Worker("zhao6",24,3300);List list1=new ArrayList();list1.add(w1);list1.add(w2);list1.add(w3);list1.add(1,w4);list1.remove(w3);for(int i=0;i<list1.size();i+)Worker wer=(Worker)list1.get(i); System.out.println(wer.getName()+"t"+wer.getAge()+"t"+wer.getSalary();Iterator it=list1.iterator();while(it.hasNext() Worker w=(Worker) it.next(); w.work();（Map）利用Map，完成下面的功能：从命令行读入一个字符串，表示一个年份，输出该年的世界杯冠军是哪支球队。如果该年没有举办世界杯，则输出：没有举办世界杯。package z1;import java.util.HashMap;import java.