java实验作业类的定义与描述

//1三角形的定义与描述
package test;

public class sjx {
     private double a,b,c;

  public sjx(double a, double b, double c) {
    this.a = a;
    this.b = b;
    this.c = c;
  }
     
  public double C(){
    return a+b+c;
  }
  public double S(){
    double p=C()*0.5;
    double s=Math.sqrt(p*(p-a)*(p-b)*(p-c));
    return s;
  }
  public void print(){
    System.out.println(a+" "+b+" "+c+" ");
  }
}
package test;

public class testsjx {

  public static void main(String[] args) {
    sjx sjx=new sjx(3,4,5);
    System.out.println("三角形的三边分别为");
    sjx.print();
    System.out.println("三角形的周长为："+sjx.C());
    System.out.println("三角形的面积为:"+sjx.S());    
  }

}
//2.圆的定义和描述
package test;

public class circle {
       private double r;

  public circle(double r) {
    this.r = r;
  }
  public double C(){
    return 2*r*Math.PI;
  }
  public double S(){
    return Math.PI*r*r;
  }
  public void output(){
    System.out.println("圆的的半径为"+r+"\n"+"圆的周长为:"+C()+"\n"+"圆的面积为:"+S());
  }
       
}
package test;

public class testcircle {

  public static void main(String[] args) {
  circle circle=new circle(4);
  circle.output();

  }

}
//3.圆柱的定义和描述
package test;

public class yz {
    private double r,h;

  public yz(double r, double h) {
    this.r = r;
    this.h = h;
  }
  public double DC(){
    return 2*r*Math.PI;
  }
  public double DS(){
    return Math.PI*r*r;
  }
  public double BS(){//圆柱的表面积
    return 2*DS()+DC()*h;
  }
  public double V(){//圆柱的体积
    return DS()*h;
  }
  public void output(){
    System.out.println("圆柱的的半径为"+r+"\n"+"圆柱的高为"+h+"\n"+"圆柱的表面积为:"+BS()+"\n"+"圆柱的体积为:"+V());
  }
}
package test;

public class testyz {

  public static void main(String[] args) {
    yz yz=new yz(3,4);
    
       yz.output();
  }

}
//5.图形的定义与描述
package test;

public class tx {
      private String xz;//图形的形状
      private double dx;//图形的大小
      private String zx;//图形的存在形式,立体or平面
  public tx(String xz, double dx, String zx) {
    this.xz = xz;
    this.dx = dx;
    this.zx = zx;
  }
  public void output(){
    System.out.println("图形的形状:"+xz+"\n"+"图形的大小:"+dx+"\n"+"图形的存在形式:"+zx);
  }  
}
package test;

public class testtx {

  public static void main(String[] args) {
       
    tx tx=new tx("圆形",40,"平面");
    tx.output();
  }

}
//6计算机的定义与描述
package test;

public class computer {
     private String cpu;
     private String xk;
     private String zb;
  public computer(String cpu, String xk, String zb) {
    this.cpu = cpu;
    this.xk = xk;
    this.zb = zb;
  }
  public void output(){
    System.out.println("cpu为:"+cpu+"\n"+"显卡为:"+xk+"\n"+"主板为:"+zb);
  }  
}
package test;

import java.util.Scanner;

public class testcomputer {

  public static void main(String[] args) {
     String a,b,c;
     Scanner in=new Scanner(System.in);
     System.out.println("请输入计算机的cpu/显卡/和主板类型:");
     a=in.next();
     b=in.next();
     c=in.next();
     computer computer=new computer(a, b, c);
     computer.output();
  }

}
//7.课程的定义和描述
package test;

public class kc {
   private String lesson;//什么课
   private String time;//什么时候上课
   private String teacher;//什么老师教授
  public kc(String lesson, String time, String teacher) {
  this.lesson = lesson;
  this.time = time;
  this.teacher = teacher;
}
  public void output(){
    System.out.println("课程为:"+lesson+"\n"+"老师为:"+teacher+"\n"+"上课时间为:"+time);
  }
}
package test;

public class testkc {

  public static void main(String[] args) {
    kc kc=new kc("java程序设计", "周一下午第二节和周五上午第二节", "张老师");
           kc.output();
  }

}
//8日期的定义与描述
package test;

public class date {
     private String today;//今天几号
     private String luck;//是否为吉日
  public date(String today, String luck) {
    this.today = today;
    this.luck = luck;
  }
  public void output(){
    System.out.println("今天几号:"+today+"\n"+"是否为吉日:"+luck);
  }
}
package test;

public class testdate {

  public static void main(String[] args) {
      date date=new date("2020/11/06", "是");
      date.output();
  }

}
//9文件夹的定义与描述
package test;

public class file {
     private String pan;//哪个盘上的文件夹
     private String kj;//是否为可见文件夹
  public file(String pan, String kj) {
    this.pan = pan;
    this.kj = kj;
  }
  public void output(){
    System.out.println("哪个盘上的文件夹:"+pan+"\n"+"是否为可见文件夹:"+kj);
  }     
}
package test;

public class testfile {

  public static void main(String[] args) {
      file file =new file("D盘", "是");
      file.output();
  }

}
//10.上课的课堂的描述
package test;

public class kt {
  private String teacher;// 上课老师为
  private String qiandao;// 是否签到
  private String homework;// 是否留家庭作业了

  public kt(String teacher, String qiandao, String homework) {
    this.teacher = teacher;
    this.qiandao = qiandao;
    this.homework = homework;
  }
  public void output(){
    System.out.println("上课老师为:"+teacher+"\n"+"是否签到:"+qiandao+"\n"+"是否留家庭作业了:"+homework);
  }
}
package test;

public class testkt {

  public static void main(String[] args) {
     kt kt=new kt("张老师", "是", "没有");
     kt.output();
  }

}
//11.手机的定义与描述
package test;

public class phone {
      private String user;//使用者
      private int G;//几G手机
      private int rom;//存储空间多大
      private int ram;//运行内存多大
  public phone(String user, int g, int rom, int ram) {
    this.user = user;
    G = g;
    this.rom = rom;
    this.ram = ram;
  }
  public void output(){
    System.out.println("手机使用者为:"+user+"\n"+G+"G手机"+"\n"+"存储空间为:"+rom+"\n"+"运行内存为:"+ram);
  }  
}
package test;

public class phonetest {

  public static void main(String[] args) {
  phone phone=new phone("小明", 5, 512, 16);
  phone.output();
  }

}
//12.教材如何定义与描述的
package test;

public class textbook {
       private String name;//书名
       private String author;//作者
       private String kind;//什么类别的
  public textbook(String name, String author, String kind) {
    this.name = name;
    this.author = author;
    this.kind = kind;
  }
  public void output(){
    System.out.println("书名为"+name+"\n"+"作者为:"+author+"\n"+"书的类别为:"+kind);
  }
}
package test;

public class textbooktest {

  public static void main(String[] args) {
    textbook textbook=new textbook("java", "小明", "教育用书");
    textbook.output();
  }

}
//13.班级的定义与描述
package test;

public class class_ {
     private String name;//班级名字
     private int person;//班级人数
     private String banzhang;//班长
  public class_(String name, int person, String banzhang) {
    this.name = name;
    this.person = person;
    this.banzhang = banzhang;
  }
  public void output(){
    System.out.println("班级名字为"+name+"\n"+"班长为:"+banzhang+"\n"+"班级人数为:"+person);
  }
}
package test;

public class class_test {

  public static void main(String[] args) {
    class_ a=new class_("计算机六班", 25, "小明");
    a.output();
  }

}
//14.选课的定义与描述
package test;

public class xk {
     private String time;//选课时间
     private String bs;//系统内置的必修课
     private String xx;//选修课
  public xk(String time, String bs, String xx) {
    this.time = time;
    this.bs = bs;
    this.xx = xx;
  }
  public void output(){
    System.out.println("选课时间为"+time+"\n"+"必修课为:"+bs+"\n"+"选修课为:"+xx);
  }
}
package test;

public class xktest {

  public static void main(String[] args) {
    xk a=new xk("2021年一月13日", "javaweb", "美学");
    a.output();

  }

}
//15.一个大学如何定义与描述
package test;

public class university {
      private String local;//位于哪里
      private String name;//大学名字
      private int ss;//在校学生
  public university(String local, String name, int ss) {
    this.local = local;
    this.name = name;
    this.ss = ss;
  }
  public void output(){
    System.out.println("大学校名为"+name+"\n"+"位于:"+local+"\n"+"在校学生人数为:"+ss);
  }
}
package test;

public class universitytest {

  public static void main(String[] args) {
    university a=new university("泰安市", "山东农业大学", 40000);
    a.output();

  }

}
//1.直线方程一般式
package test;

import java.util.Scanner;

public class line_1 {
      private double a;
      private double b;
      private double c;
      private double x;
      private double y;
      public line_1(){
      }
  public line_1(double a, double b, double c) {
    this.a = a;
    this.b = b;
    this.c = c;
  }
  public double getX() {
    return x;
  }
  public void setX(double x) {
    this.x = x;
  }
  public double getY() {
    return y;
  }
  public void setY(double y) {
    this.y = y;
  }
  public double d() {
    double fm=Math.sqrt(a*a+b*b);
    double fz=Math.abs(a*x+b*y+c);
    return fz/fm;
  }
  public void jd() {
    double xz=-c/a;//直线与x轴上的交点
    double yz=-c/b;//直线与y轴上的交点
    System.out.println("直线与x轴上的交点为:"+xz);
    System.out.println("直线与y轴上的交点为:"+yz);
  }
  public void input() {
    System.out.println("请输入一般式直线方程的A,B,C三个参数:");
    Scanner in=new Scanner(System.in);
     a=in.nextDouble();
     b=in.nextDouble();
     c=in.nextDouble();
    System.out.println("宁所输入的直线方程为:"+a+"*X+"+b+"*Y+"+c+"*C"+"=0");
    System.out.println("请输入坐标x,y以求其到直线的距离");
    x=in.nextDouble();
    y=in.nextDouble();
  }
  public void output() {
    System.out.println("点"+"("+x+","+y+")"+"到"+a+"*X+"+b+"*Y+"+c+"*C"+"=0"+"的距离为:"+d());
  }
     
}
package test;

public class line_1test {

  public static void main(String[] args) {
    line_1 a=new line_1();
    a.input();
        a.output();
        a.jd();
  }

}
//2.直线方程点斜式
package test;

public class line_2 {
  private double x0, x1;
  private double y0, y1;
  private double k;

  public line_2(double x0, double y0, double x1, double y1, double k) {
    this.x0 = x0;
    this.y0 = y0;
    this.x1 = x1;
    this.y1 = y1;
    this.k = k;
  }

  public double d() {
    double fm = Math.sqrt(1 + k * k);
    double fz = Math.abs(k * x1 - y1 + y0 - k * x0);
    return fz / fm;
  }
  public void output() {
    System.out.println("点"+"("+x1+","+y1+")"+"到直线y-2=2*(x-1)"+"的距离为:"+d());
  }
}
package test;

public class line_2test {

  public static void main(String[] args) {
    line_2 a=new line_2(1, 2, 3, 4, 2);
    a.output();
  }

}
//3.直线方程截距式
package test;

public class line_3 {
       private double a,b,x,y;

  public line_3(double a, double b, double x, double y) {
    this.a = a;
    this.b = b;
    this.x = x;
    this.y = y;
  }
      private double d() {
      double fm = Math.sqrt(a*a+b*b);
      double fz = Math.abs(b*x+a*y-a*b);
      return fz / fm;
      }
      public void output() {
        System.out.println("点"+"("+x+","+y+")"+"到直线x/1+y/2=1"+"的距离为:"+d());
      }
}
package test;

public class line_3test {

  public static void main(String[] args) {
    line_3 a=new line_3(1, 2, 3, 4);
    a.output();
  }

}
//4.直线方程斜截式
package test;

public class line_4 {
  private double k, b, x, y;

  public line_4(double k, double b, double x, double y) {
    this.k = k;
    this.b = b;
    this.x = x;
    this.y = y;
  }

  private double d() {
    double fm = Math.sqrt(1 + k * k);
    double fz = Math.abs(k * x - y + b);
    return fz / fm;
  }

  public void output() {
    System.out.println("点" + "(" + x + "," + y + ")" + "到直线y=1*x+b" + "的距离为:" + d());
  }
}
package test;

public class line_4test {

  public static void main(String[] args) {
    line_4 a=new line_4(1, 2, 3, 4);
    a.output();
  }

}
//5.直线方程两点式
package test;

public class line_5 {
        private double x,y,x1,y1,x2,y2;
    public line_5(double x, double y, double x1, double y1, double x2, double y2) {
      this.x = x;
      this.y = y;
      this.x1 = x1;
      this.y1 = y1;
      this.x2 = x2;
      this.y2 = y2;
    }
    private double d() {
      double k=(y2-y1)/(x2-x1);
      double fm = Math.sqrt(1 + k * k);
      double fz = Math.abs(k * x - y + y1 - k * x1);
      return fz / fm;
    }
    public void output() {
      System.out.println("点" + "(" + x + "," + y + ")" + "到直线(y-4)/(6-4)=(x-3)/(5-3)" + "的距离为:" + d());
    }
}
package test;

public class line_5test {

  public static void main(String[] args) {
    line_5 a=new line_5(6, 5, 3, 4, 5, 6);
    a.output();
  }

}
//定义素数
package test;

public class sushu {
       private int i,j,l,r;
       public sushu() {
         
       }
       
    public int getL() {
    return l;
  }

  public void setL(int l) {
    this.l = l;
  }

  public int getR() {
    return r;
  }

  public void setR(int r) {
    this.r = r;
  }
    
  public sushu(int l, int r) {
    this.l = l;
    this.r = r;
  }

  public void fun() {
    int count=0;
    int m=l;
    if(l==1) {
      l=2;
    }
     System.out.println(m+"到"+r+"之间的素数为:");
         for(i=l;i<=r;++i) {
           int t=0;
           for(j=2;j<=Math.sqrt(i);++j) {
             if(i%j==0) {
               ++t;
             }
           }
           if(t==0) {
            
             System.out.print(i+" ");
             count++;
             if(count%5==0) {
               System.out.println();
             }
           }
         }
       }
  
  
}
package test;

import java.util.Scanner;

public class sushutest {

  public static void main(String[] args) {
  System.out.println("请输入宁想取那段区间的素数:");
  Scanner in=new Scanner(System.in);
  int l=in.nextInt();
  int r=in.nextInt();
  sushu a=new sushu(l, r);
  a.fun();
  }

}