Java第四次作业

public class manage{
    private int l;
    private int n;
    public manage() {
        
    }
    public manage(int l,int n) {
        this.l=l;
        this.n=n;
    }
    public int getshow1() {
        return l;
    }
    public void setshow1(int l) {
        this.l=l;
    }//设置上月电费情况
    
    public int getshow2() {
        return n;
    }
    public void setshow2(int n) {
        if(n%100==0)
        this.n=n;
        else
        n=n-n%100+100;
    }//设置本月电费情况
    public void things() {
        System.out.println("上月电费情况"+l+",本月电费情况"+n);
    }
    public static void main(String args[]) {
        manage m1 = new manage(1000,1200);
        m1.things();
        System.out.println("本月缴费情况"+(m1.n-m1.l)*1.2);
        manage m2 = new manage(1200,1450);
        m2.things();
        System.out.println("本月缴费情况"+(m2.n-m2.l)*1.2);
    }
}
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2、 编写“圆柱体”类及其测试类。

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public class cylinder {
    private int r;
    private int h;
public cylinder(int r,int h) {
    this.r = r;
    this.h = h;
}
 public int getRadius() {
     return r;
 }
 public void setRadius(int r) {
     this.r=r;
 }//设置半径
 public double gerHeight() {
     return h;
 }
 public void setHeight(int h) {
     this.h=h;
 }//设置高度
 public void BaseArea() {
     System.out.println("底面积"+3.14*r*r);
 }
 public void Volumr() {
     System.out.println("体积"+3.14*r*r*h);
 }
 public void All() {
     System.out.println("圆底半径,"+r+",高"+h+",底面积"+3.14*r*r+",体积"+3.14*r*r*h);
 }
 public static void main(String args[]) {
     cylinder c1= new cylinder(5,6);
     c1.BaseArea();
     c1.Volumr();
     c1.All();
     cylinder c2= new cylinder(7,8);
     c2.BaseArea();
     c2.Volumr();
     c2.All();
 }
 
 

}
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3、编写“四则运算类”及其测试类。

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package leven;

import java.util.*;

public class operation {
     private int num1;
      private int num2;
      private String opera;
    public operation(int num1,int num2,String opera) {
        this.num1=num1;
        this.num2=num2;
        this.opera=opera;
        }
     public int getNum1() {
         return num1;
    }
     public void setNum1(int num1) {
         this.num1=num1;
     }
     public int getNum2() {
         return num2;
    }
     public void setNum2(int num1, int num2) {
         this.num2=num2;
     }
     public void Plus() {
         System.out.println(num1+num2);
     }
     public void Subtract() {
         System.out.println(num1-num2);
     }
     public void Multiply() {
         System.out.println(num1*num2);
     }
     public void Divide() {
         System.out.println(num1/num2);
     }
     public static void main(String args[]) {
         int i,j;
         String k;
         Scanner sc = new Scanner(System.in);
         i=sc.nextInt();
         j=sc.nextInt();
         k=sc.next();
         operation o1 = new operation(i,j, k);
         System.out.println("请输入两个数和一个操作符号：");
            if(k=="+")
                o1.Plus();
            if(k=="-")
                o1.Subtract();
            if(k=="*")
                o1.Multiply();
            if(k=="/")
                o1.Divide();
     }
}