Java上机实验考试.doc

实验报告21.编写一个程序，要求将一个浮点数强制转化成整型后再输出。package javaapplication1; public class Main public static void main(String args) float a = 5.2f; int b; b =(int)a; System.out.printf(b=%dn,b); 2、请计算出3至1000范围内最大的10个素数，并计算出其累加和。package javaapplication1; public class Main1 public static boolean isPrime(int data) for(int i = 2; i=3;i-) if(count=10) break; if(isPrime(i) sum = sum + i; count+; System.out.print(i+,); System.out.println(n十个素数之和 ： + sum); 3、编写一程序，输出今年的年历。package shiyan23;import java.util.Scanner;public class Mainpublic static void main(String args) Scanner input=new Scanner(System.in); System.out.println(-欢迎使用万年历程序-); System.out.print(请输入年份:); int year=input.nextInt(); System.out.print(n请输入月份:); int month=input.nextInt(); System.out.println(); int totalDays=0;if(year=1900) for(int i=1900;iyear;i+) if(i%4=0 & i%100!=0)|(i%400=0) totalDays+=366; else totalDays+=365; int daysOfMonth=0; int days; for(int i=1;imonth;i+) switch(i) case 2: if(year%4=0 & year%100!=0)| year%400=0) days=29; else days=28; break; case 4: case 6: case 9: case 11: days=30; break; default: days=31; daysOfMonth+=days; switch(month) case 2: if(year%4=0 & year%100!=0)| year%400=0) days=29; else days=28; break; case 4: case 6: case 9: case 11: days=30; break; default: days=31; totalDays+=daysOfMonth; int firstDay=(totalDays)%7+1; if(firstDay=7)firstDay=0; System.out.println(星期日t星期一t星期二t星期三t星期四t星期五t星期六);/显示月历 for(int i=0;ifirstDay;i+) System.out.print(t); for(int i=1;i0&yearyear;i-) if(i%4=0 & i%100!=0)|(i%400=0) totalDays+=366; else totalDays+=365; int daysOfMonth=0; int days; for(int i=12;i=month;i-) switch(i) case 2: if(year%4=0 & year%100!=0)| year%400=0) days=29; else days=28; break; case 4: case 6: case 9: case 11: days=30; break; default: days=31; daysOfMonth+=days; switch(month) case 2: if(year%4=0 & year%100!=0)| year%400=0) days=29; else days=28; break; case 4: case 6: case 9: case 11: days=30; break; default: days=31; totalDays+=daysOfMonth; int firstDay=8-(totalDays)%7; if(firstDay=7)firstDay=0; if(firstDay=8)firstDay=1; System.out.println(星期日t星期一t星期二t星期三t星期四t星期五t星期六); for(int i=0;ifirstDay;i+) System.out.print(t); for(int i=1;i=days;i+) System.out.print(i+t); if(i-1)%7+firstDay=6) System.out.println(); System.out.println(n程序结束); 实验报告31、仔细阅读下面的Java语言源程序，按照Java命名规范修改汉字标识符部分，写出程序的详细运行过程及可能的结果，并上机验证。Aclass 梯形 float 上底, 下底, 高, 面积;梯形 (float x, float y, float h) 上底=x;下底=y;高=h;float 计算面积() 面积=(上底+下底)*高/2.0f;return 面积;void 修改高(float height) 高=height; float 获取高() return 高;public class MyClass1 public static void main(String args) 梯形 laderOne=new 梯形(12.0f, 3.5f, 50), laderTwo=new 梯形(2.67f, 3.0f, 10);System.out.println(laderOne的高是:+laderOne.获取高();System.out.println(laderTwo的高是:+laderTwo.获取高();System.out.println(laderOne的面积是:+laderOne.计算面积();System.out.println(laderTwo的面积是:+laderTwo.计算面积();laderOne.修改高(10);float h=laderOne.获取高();laderTwo.修改高(h*2);System.out.println(laderOne现在的高是:+laderOne.获取高();System.out.println(laderTwo现在的高是:+laderTwo.获取高();System.out.println(laderOne现在的面积是:+laderOne.计算面积();System.out.println(laderTwo现在的面积是:+laderTwo.计算面积(); A、代码：package javaapplication4;public class Main public static void main(String args) class 梯形 float 上底, 下底, 高, 面积;梯形 (float x, float y, float h) 上底=x;下底=y;高=h;float 计算面积() 面积=(上底+下底)*高/2.0f;return 面积;void 修改高(float height) 高=height; float 获取高() return 高;梯形 laderOne=new 梯形(12.0f, 3.5f, 50), laderTwo=new 梯形(2.67f, 3.0f, 10);System.out.println(laderOne的高是:+laderOne.获取高();System.out.println(laderTwo的高是:+laderTwo.获取高();System.out.println(laderOne的面积是:+laderOne.计算面积();System.out.println(laderTwo的面积是:+laderTwo.计算面积();laderOne.修改高(10);float h=laderOne.获取高();laderTwo.修改高(h*2);System.out.println(laderOne现在的高是:+laderOne.获取高();System.out.println(laderTwo现在的高是:+laderTwo.获取高();System.out.println(laderOne现在的面积是:+laderOne.计算面积();System.out.println(laderTwo现在的面积是:+laderTwo.计算面积(); Bclass People String face;void setFace(String s)face=s;class A void f(int x, double y, People p) x=x+1;y=y+1;p.setFace(笑脸);System.out.println(参数x和y的值分别是:+x+,+y);System.out.println(参数对象p的face是:+p.face); public class MyClass2 public static void main(String args) int x=100;double y=100.88;People zhang=new People();zhang.setFace(很严肃的样子);A a=new A();a.f(x,y,zhang);System.out.println(main方法中x和y的值仍然分别是:+x+,+y);System.out.println(main方法中对象zhang的face是:+zhang.face);B、代码：package javaapplication6;class People String face;void setFace(String s)face=s;class A void f(int x, double y, People p) x=x+1;y=y+1;p.setFace(笑脸);System.out.println(参数x和y的值分别是:+x+,+y);System.out.println(参数对象p的face是:+p.face);public class Main public static void main(String args) int x=100;double y=100.88;People zhang=new People();zhang.setFace(很严肃的样子);A a=new A();a.f(x,y,zhang);System.out.println(main方法中x和y的值仍然分别是:+x+,+y);System.out.println(main方法中对象zhang的face是:+zhang.face); Cclass 圆 double 半径;圆(double r) 半径=r;double 计算面积() return 3.14*半径*半径;void 修改半径(double 新半径) 半径=新半径;double 获取半径() return 半径;class 圆锥 圆 底圆;double 高;圆锥(圆 circle, double h) this.底圆=circle;this.高=h;double 计算体积() double volume;volume=底圆.计算面积()*高/3.0;return volume;void 修改底圆半径(double r) 底圆.修改半径(r);double 获取底圆半径() return 底圆.获取半径();public class MyClass3 public static void main(String args) 圆 circle=new 圆(10);圆锥 circular=new 圆锥(circle,20);System.out.println(圆锥底圆半径:+circular.获取底圆半径();System.out.println(圆锥的体积:+circular.计算体积();circular.修改底圆半径(100);System.out.println(圆锥底圆半径:+circular.获取底圆半径();System.out.println(圆锥的体积:+circular.计算体积();C、代码：package javaapplication8;class 圆 double 半径;圆(double r) 半径=r;double 计算面积() return 3.14*半径*半径;void 修改半径(double 新半径) 半径=新半径;double 获取半径() return 半径;class 圆锥 圆 底圆;double 高;圆锥(圆 circle, double h) this.底圆=circle;this.高=h;double 计算体积() double volume;volume=底圆.计算面积()*高/3.0;return volume;void 修改底圆半径(double r) 底圆.修改半径(r);double 获取底圆半径() return 底圆.获取半径();public class Main public static void main(String args) 圆 circle=new 圆(10);圆锥 circular=new 圆锥(circle,20);System.out.println(圆锥底圆半径:+circular.获取底圆半径();System.out.println(圆锥的体积:+circular.计算体积();circular.修改底圆半径(100);System.out.println(圆锥底圆半径:+circular.获取底圆半径();System.out.println(圆锥的体积:+circular.计算体积(); 实验报告41、定义一个类实现银行帐户的概念，其属性有“帐号”和“存款余额”，方法有“存款”、“取款”、“查询余额”和“显示帐号”。再定义主类，创建帐户类的对象，并完成相应操作。提示：关键代码如下：public int getLeftMoney() return leftMoney;public void saveMoney(double money) leftMoney+=money;public void getMoney(double money) if (money=leftMoney)leftMoney-=money;elseSystem.out.println(只能取：+leftMoney);.BankAccount ba=new BankAccount();ba.setBankAccount (888123,1000); /开户ba.saveMoney(21000);System.out.println(存入21000元后余额为：+ba.getLeftMoney();ba.getMoney(11500);System.out.println(取出11500元后余额为：+ba.getLeftMoney();算法：1Main : package javaapplication4;public class Main public static void main(String args) BankAccount ba=new BankAccount();ba.setBankAccount (888123,1000); /开户ba.saveMoney(21000);System.out.println(存入21000元后余额为：+ba.getLeftMoney();ba.getMoney(11500);System.out.println(取出11500元后余额为：+ba.getLeftMoney(); BankAccount:package javaapplication4;public class BankAccount private int saveMoney; private int leftMoney; private int Money; private int BankAccount;public int getLeftMoney() return leftMoney;public void saveMoney(double money) leftMoney+=money;public void getMoney(double money) if (money=leftMoney)leftMoney-=money;elseSystem.out.println(只能取：+leftMoney); void setBankAccount(int BankAccount, int LeftMoney) this.BankAccount=BankAccount; this.leftMoney=LeftMoney; System.out.println(帐号为：+BankAccount)； 2、先创建一个MyPoint类，然后定义Triangle类。在Triangle类中定义三个MyPoint的实例来表示一个三角、形的三个点，再定义一个方法setTri对这三个点进行初始化，然后定义两个方法求三角形的周长、面积。在main()中创建一个对象，求给定三点的三角形的周长、面积。算法2package javaapplication3;public class Main public static void main(String args) Triangle t =new Triangle(); t.setTri(0, 0, 0, 3, 4, 0); System.out.println(三角形周长：+t.Circumference(t); System.out.println(三角形面积：+t.Area(t); public class MyPoint double x, y;class Triangle MyPoint p1 = new MyPoint(); MyPoint p2 = new MyPoint(); MyPoint p3 = new MyPoint(); void setTri(double x1, double y1, double x2, double y2, double x3, double y3) this.p1.x = x1; this.p1.y = y1; this.p2.x = x1; this.p1.y = y2; this.p3.x = x3; this.p3.y = y3; double Circumference(Triangle t) double line1, line2, line3; line1 = Math.hypot(t.p1.x - t.p2.x), (t.p1.y - t.p2.y); line2 = Math.hypot(t.p2.x - t.p3.x), (t.p2.y - t.p3.y); line3 = Math.hypot(t.p1.x - t.p3.x), (t.p1.y - t.p3.y); return line1 + line2 + line3; double Area(Triangle t) double line1, line2, line3; line1 = Math.hypot(t.p1.x - t.p2.x), (t.p1.y - t.p2.y); line2 = Math.hypot(t.p2.x - t.p3.x), (t.p2.y - t.p3.y); line3 = Math.hypot(t.p1.x - t.p3.x), (t.p1.y - t.p3.y); double p = Circumference(t)/2; return Math.sqrt(p-line1)*(p-line2)*(p-line3)*p); 实验报告51、运行下面的程序，将“public int x, y;”改为“private int x, y;”后重新编译程序会出现什么情况？如何解决？如果在main()中先显示num的值再输出调用getNum()的结果应怎样写代码？请给出完整程序。class Value public int x, y;public void setValue(int a, int b) x=a;y=b;public class MyClass int num=0;public static void main(String args) int total;Value v = new Value();v.setValue(24, 65);total=v.x+v.y;System.out.println(add=+total);public int getNum() num +;return num;算法1：package MyClass;public class MyClass int num=0; public static void main(String args) class Value private int x, y; public void setValue(int a, int b) x=a; y=b; int total; Value v = new Value(); v.setValue(24, 65); total=v.x+v.y; System.out.println(add=+total); public int getNum() num +; return num; 2、分析通讯录程序应该由哪些类组成，它们的属性和服务各是什么。编写相应的类并测试。提示：通讯录中应考虑同学、家人、好友等对象，还应考虑通讯录程序一般都具有哪些功能。算法2：package javaapplication6;import java.io.IOException;import java.util.*;public class Main public static void main(String args) throws IOException System.out.println(=通讯录=); System.out.println(1.添加联系人); System.out.println(2.删除联系人(按姓名查找); System.out.println(3.修改联系人(按姓名查找); System.out.println(请输入要操作的序号：); Scanner s=new Scanner(System.in); int getinput=s.nextInt(); Card c=new Card(); switch(getinput) case 1:c.Add(); break; case 2:c.Delete(); break; case 3:c.Modify(); break; default:System.out.println(输入错误！请重新输入！); break; Card:package javaapplication6;import java.io.IOException;import java.io.InputStream;import java.util.*;public class Card private String name;/姓名private String appellation;/称呼 private String sex; /性别 private String relation; /关系private String tel; /电话号码private String handset;/手机号码private String email;/电子邮箱 public Card() public Card(String n, String a,String s, String r, String t, String h, String e) name = new String(n); appellation = new String(a); sex=new String(s); relation = new String(r); tel = new String(t); handset = new String(h); email = new String(e); /更改成员变量值 public void setName(String name) = name; public void setAppellation(String appellation) this.appellation = appellation; public void setSex(String sex) this.sex = sex; public void setRelation(String relation) this.relation=relation; public void setTel (String tel) this.tel = tel; public void setHandset(String handset) this. handset = handset; public void setEmail(String email) this.email =email; public String getName() return name; public String getAppellation() return appellation; public String getSex() return sex; public String getRelation() return relation; public String getTel() return tel; public String getHandset() return handset; public String getEmail() return email; public String toString() return t+name + t +appellation + nn +sex+n+ relation + nt + tTel: + tel + nt手机: + handset + ntEmail: + email; public void Add() throws IOException System.out.println(请依次输入姓名t称呼t性別t关系t电话号码t手机号码t电子邮箱); Scanner s=new Scanner(System.in); int i=System.in.read(); char e=(char) i; public void Delete() System.out.println(请输入要删除的姓名); Scanner s=new Scanner(System.in); String name=s.next(); if(getName().equals(name) setName(null); setAppellation(null); setSex(null); setRelation(null); setTel(null); setHandset(null); setEmail(null); else System.out.println(沒有此记录！); public void Modify() throws IOException System.out.println(请输入要修改的姓名); Scanner s=new Scanner(System.in); String name=s.next(); if(getName().equals(name) System.out.println(请依次输入姓名t称呼t性別t关系t电话号码t手机号码t电子邮箱); int i=System.in.read(); char e=(char) i; else System.out.println(无此记录); 实验报告61、 请为管理学校中教师的工作证和学生的学生证设计一个类体系结构，尽可能保证代码的重用率。假设工作证包括编号、姓名、性别、出生年月、职务和签发工作证日期；学生证包括编号、姓名、性别、出生年月、系别、入校日期及每学年的注册信息。算法：（1）Main:package javaapplication11;public class Main public static void main(String args) TeacherID a=new TeacherID(); a.setNum(123); a.setName(张三); a.setSex(男); a.setBirthdate(1971.10.11); a.setPosition(教授); a.setWorkdate(1991.10.01); System.out.println(教师工作证:); a.getNum(); a.getName(); a.getSex(); a.getBirthdate(); a.getPosition(); a.getWorkdate