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();
}
}