王颖奇 201771010129《面向对象程序设计（java）》第四周学习总结 实验3  编写长方形类Rectangle与圆形类Circle，其中Rectangle类设置私有属性：width,length；Circle类设置私有属性radius。编写Rectangle类的带参构造函数Rectangle(int width,int length), Circle类的带参构造函数Circle(int radius)，编写两个类的toString方法(Eclipse可自动生成)。上述2个类均定义以下方法：

package shiyan2;

import java.util.Scanner;

/**
 * This program tests the Student class.
 * time 2018 9 20
 * @author Wang yingqi
 */
public class shiyan1
{
   public static void main(String[] args)
   {
      // 填入四个学生的信息
      int x=4;
      Employee[] staff = new Employee[x];
      System.out.println("请输入学生：");
      Scanner in = new Scanner(System.in); 
      for(int i=0;i<staff.length;i++) {
          staff[i]=new Employee(in.next(),in.next(),in.nextInt());
      }
      System.out.println("name"+" "+"sex"+" "+" "+"javascore");

      // 输出四个学生的信息
      for (Employee e : staff)
         System.out.println(e.getName() +"   "+e.getSex()+"        "+e.getJavaScore());
   }
}

class Employee
{
   private String name;
   private String sex;
   private int javascore;

   public Employee(String n, String s, int m)
   {
      name = n;
      sex = s;
      javascore =m;
   }

   public String getName()
   {
      return name;
   }

   public String getSex()
   {
      return sex;
   }

   public int getJavaScore()
   {
      return javascore;
   }

}

package tuxing;

import java.math.BigDecimal;
import java.util.Scanner;

class Test {
public static void main(String[] args) {

Scanner sc = new Scanner(System.in);
System.out.println("请输入长方形的长：");
int length = sc.nextInt();
System.out.println("请输入长方形的宽：");
int width = sc.nextInt();
System.out.print("请输入圆的半径-->");
float radius=sc.nextFloat();

tuxing x = new tuxing();

x.setLength(length);
x.setWidth(width);
x.setRadius(radius);

System.out.println("矩形的周长是："+x.getPerimeter());
System.out.println("矩形的面积是："+x.getArea());
System.out.println("圆的周长为-->"+x.getPerimeter(radius)+"
"+"圆的面积为-->"+x.getArea(radius));

BigDecimal bd1 = new BigDecimal(x.getPerimeter(radius));
BigDecimal bd2 = new BigDecimal(x.getArea(radius));
BigDecimal bd3 = new BigDecimal(x.getPerimeter());
BigDecimal bd4 = new BigDecimal(x.getArea());
BigDecimal bd5 = bd1.add(bd3);
BigDecimal bd6 = bd2.add(bd4);
bd5= bd5.setScale(2, BigDecimal.ROUND_HALF_UP);
bd6= bd6.setScale(2, BigDecimal.ROUND_HALF_UP);
System.out.println("周长和："+bd5+"
"+"面积和"+bd6);
}
}

package tuxing;

import java.util.Scanner;
import java.math.BigDecimal;

class tuxing{
private int length;
private int width;
float radius;

public tuxing(){}

public void setLength(int length) {
this.length = length;
}

public void setWidth(int width) {
this.width = width;
}

public int getPerimeter() {
return (length + width) * 2;
}

public int getArea() {
return length * width;
}

public void setRadius(float radius) {
    BigDecimal bd = new BigDecimal(radius);
    radius = bd.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();
this.radius = radius;
}

public float getPerimeter(float radius){
    BigDecimal bd = new BigDecimal(radius);
    radius = bd.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();
return (float) (radius*2*3.14);
}

public float getArea(float radius){
    BigDecimal bd = new BigDecimal(radius);
    radius = bd.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();
return (float) (radius*radius*3.14);
}
}