public class Circle {
private double radius = 0d;
public Circle(){
this.radius = 0d;
}
public Circle(double r){
this.radius = r;
}
public double getArea(){
return Math.PI*radius*radius;
}
public double getPerimeter(){
return Math.PI*radius*2;
}
void show(){
System.out.println(String.format("半径：%.2f",radius));
System.out.println(String.format("周长：%.2f",getPerimeter()));
System.out.println(String.format("面积：%.2f",getArea()));
}
}追问
private double radius = 0d;
public Circle(){
this.radius = 0d;
}
public Circle(double r){
this.radius = r;
}
public double getArea(){
return Math.PI*radius*radius;
}
public double getPerimeter(){
return Math.PI*radius*2;
}
void show(){
System.out.println(String.format("半径：%.2f",radius));
System.out.println(String.format("周长：%.2f",getPerimeter()));
System.out.println(String.format("面积：%.2f",getArea()));
}
}追问
没有main
温馨提示：内容为网友见解，仅供参考
第1个回答 2017-03-30
package test02;public class Circle { private static final double PI = 3.1415926535; private double Radius;//圆的半径 public Circle(){ this(0); } public Circle(double r){ Radius = r; } public double getArea(){ return PI*Radius*Radius; } public double getPerimeter(){ return 2*PI*Radius; } public void show(){ System.out.println("圆的半径为"+Radius+",周长为"+getPerimeter()+",面积为"+getArea()); } public static void main(String[] args) { Circle c = new Circle(2); c.show(); }}
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