Java计算环形面积代码

编写一个圆环类Ring的Java程序. 将参数传递给构造方法,计算圆环面积 area,在控制台输出.

public?class?Ring?{

double?innerRadius;

double?outerRadius;

String?color;

public?Ring(double?innerRadius,double?outerRadius){

this.innerRadius=innerRadius;

this.outerRadius=outerRadius;

}

double?area(){

public?static?void?main(String?args){

System.out.println(r.area());

java 编写一个环形类 求环的面积

public?class?Ring

{

private?double?innerR;

private?double?outR;

public?void?setDate(double?outR)

this.outR?=?outR;

public?double?getArea()

return?Math.PI*outR*outR;

public?static?void?main(String[]?args)

Ring?ring1?=?new?Ring();

System.out.println("第一个环面积为："?+?ring1.getArea());

java程序编程题

private?double?outerRadius;

private?double?innerRadius;

private?String?color;

public?Ring()?{

public?Ring(double?outerRadius,?double?innerRadius,?String?color)?{

this.outerRadius?=?outerRadius;

this.innerRadius?=?innerRadius;

this.color?=?color;

public?double?getOuterRadius()?{

return?outerRadius;

public?void?setOuterRadius(double?outerRadius)?{

public?double?getInnerRadius()?{

return?innerRadius;

public?void?setInnerRadius(double?innerRadius)?{

public?String?getColor()?{

return?color;

public?void?setColor(String?color)?{

public?double?getArea(){

//计算环形面积

return?outer?-?inner;

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