Java上机习题解答

1、任务4：编写程序，模拟银行账户功能。要求如下：属性：账号、储户姓名、地址、存款余额、最小余额方法：存款、取款、查询根据用户操作显示储户相关信息。如存款操作后，显示储户原有余额、今日存款数额及最终存款余额；取款时，若最后余额小于最小余额，拒绝取款，并显示“至少保留余额：XXX”。import java.util.Scanner;class Bank1private String account,name,address;private double over,minover;Bank1(String account,String name,String address,double over,d

2、ouble minover)this.account=account;=name;this.address=address;this.over=over;this.minover=minover;public void deposit(double de)System.out.println("原有余额为"+over+"元");System.out.println("今日存款为"+de+"元");System.out.println("现有余额为"+(over+de)+&quo

3、t;元");this.over = over+de;public void withdrawals(double wi)if(over-wi)<minover)System.out.println("至少保留余额："+minover+"元");elseSystem.out.println("原有余额为"+over+"元");System.out.println("今日取款为"+wi+"元");System.out.println("现有余额为&quo

4、t;+(over-wi)+"元");this.over = over-wi;public void inquiry()System.out.println("现有余额为"+over+"元");public class bank public static void main(String args) Scanner in = new Scanner(System.in);Bank1 b1 = new Bank1("1","2","3",100000,100);int hi =

5、 0,N,A;System.out.println("欢迎登陆银行系统！");doSystem.out.println("1.存款");System.out.println("2.取款");System.out.println("3.查询");System.out.println("请输入上方数字选择一项服务，谢谢。");N = in.nextInt();if(N = 1)System.out.println("请输入您的存款金额。");b1.deposit(in.nextD

6、ouble();else if(N = 2)System.out.println("请输入您的取款金额。");b1.withdrawals(in.nextDouble();else if(N = 3)b1.inquiry();elseSystem.out.println("请输入 '1','2'或者'3'。");continue;System.out.println("如果您想继续操作，请输入1，输入其他整数退出系统。");A = in.nextInt();if(A != 1)hi =

7、1;while(hi = 0);System.out.println("欢迎您的下次光临，再见！");任务1： 设计一个学生类Student，其属性有name（姓名）、age（年龄）和degree（学位）。由Student类派生出本科生类Undergraduate和研究生类Graduate，Undergraduate类增加属性specialty（专业），研究生类增加属性direction（研究方向）。每个类都有show（）方法，用于输出属性信息。class Studentpublic String getName() return name;public void setN

8、ame(String name) = name;public String getDegree() return degree;public void setDegree(String degree) this.degree = degree;public int getAge() return age;public void setAge(int age) this.age = age;private String name,degree;private int age;Student(String n,int a,String d)=n;this.ag

9、e=a;this.degree=d;public void show()System.out.println("name:"+name+" age:"+age+" degree:"+degree);class Undergraduate extends Studentpublic String getSpecialty() return specialty;public void setSpecialty(String specialty) this.specialty = specialty;private String speci

10、alty;public Undergraduate(String n,int a,String d,String s)super(n,a,d);this.specialty=s;public void show()System.out.println("name:"+getName()+" age:"+getAge()+" degree:"+getDegree()+" specially:"+getSpecialty();class Graduate extends Studentpublic String get

11、Direction() return direction;public void setDirection(String direction) this.direction = direction;private String direction;public Graduate(String n,int a,String d,String di)super(n,a,d);this.direction=di;public void show()System.out.println("name:"+getName()+" age:"+getAge()+&qu

12、ot; degree:"+getDegree()+" direction:"+getDirection();public class t01 public static void main(String args) Graduate G = new Graduate("zbb", 18, "xueshi", "tongxun");G.show();任务1： 创建类Rectangle，具有属性length和width。该类具有计算 perimeter(周长)和area(面积)的方法，并有length和wid

13、th的设置和读取方法。设置方法应检验length和width是否大于0.0并且小于20.0。import java.util.Scanner;class Rectangle public double getLength() return length;public void setLength(double length) this.length = length;public double getWidth() return width;public void setWidth(double width) this.width = width;private double length,

14、width;public double perimeter() return 2 * this.length * this.width;public double area() return this.length * this.width;public void jianyan() if (this.length > 0.0 && this.length < 20.0) System.out.println("Length大于0.0并且小于20.0"); else System.out.println("Length并不大于0.0并且

15、小于20.0");if (this.width > 0.0 && this.width < 20.0) System.out.println("Width大于0.0并且小于20.0"); else System.out.println("Width并不大于0.0并且小于20.0");public class t01 public static void main(String args) Scanner in = new Scanner(System.in);Rectangle r = new Rectangle()

16、;System.out.print("Length = ");r.setLength(in.nextDouble();System.out.print("Width = ");r.setWidth(in.nextDouble();r.jianyan();System.out.println("Perimeter = " + r.perimeter();System.out.println("Area = " + r.area();任务2：定义一个实现常用数学运算的类MyMath，类中提供max()、min()、su

17、m()与average()四个静态方法，每个方法带有三个整形参数，分别实现对三个整数求取最大值、最小值、和值及平均值的运算。在主类中对任意输入的三个整数，调用MyMath类的四种静态方法，求取结果并输出。import java.util.Scanner;abstract class MyMath public abstract int max(int a,int b,int c); public abstract int min(int a,int b,int c); public abstract int sum(int a,int b,int c); public abstract dou

18、ble average(int a,int b,int c);public class main extends MyMath public int max ( int a, int b, int c) if (a > b && a > c) return a; else if (b > a && b > c) return b; else return c; public int min(int a, int b, int c) if (a < b && a < c) return a; else if (b

19、 < a && b < c) return b; else return c; public int sum(int a, int b, int c) return a + b + c; public double average(int a, int b, int c) return (a + b + c) / 3; public static void main(String args) Scanner in = new Scanner(System.in); main m = new main(); System.out.println("a b c

20、"); int a,b,c; a=in.nextInt(); b=in.nextInt(); c=in.nextInt(); System.out.println("max:"+m.max(a,b,c); System.out.println("min:"+m.min(a,b,c); System.out.println("sum:"+m.sum(a,b,c); System.out.println("average:"+m.average(a,b,c); in.close();任务1： 请求1到n的数的

21、阶乘之和。基本流程如下面三个图所示。 package duihuakuang;import javax.swing.JFrame;import javax.swing.JOptionPane;public class test1 public static void main(String args) while (true) JFrame f = new JFrame(); / 创建一个应用程序框架窗口String ip = JOptionPane.showInputDialog(f, "请输入一个数"); try int a = Integer.parseInt(ip);/if(ip.equals(null)|ip.equals("")break;【1】if (a < 0)continue;long sum = 0;long jie = 1;for (int i = 1; i <= a; i+) / 阶乘之和jie *= i;sum += jie;if (sum > Long.MAX_VALUE | sum < 0) JOptionPane.showMessageDialog(f, "这数字太大了", "消息", JOptionPane.WARNING_MESSA