java 程序设计题目解答

java 程序设计题目解答

class Circle
{
double radius;
double diameter;
double area;
public Circle()
{
radius=1;
}

public double getRadius() {
return radius;
}
public void setRadius(double radius) {
this.radius = radius;
}
//下面这个方法用于计算机圆的直径
public double computeDiameter()
{
return 2*radius;
}
public double computeArea()
{
return Math.PI*radius*radius;
}

}
public class TestCircle {

public static void main(String args[])
{
Circle c1=new Circle();
Circle c2=new Circle();
Circle c3=new Circle();
c2.setRadius(5);
c3.setRadius(10);
System.out.print("第一个圆的直径为:"+c1.computeDiameter());
System.out.println(" 面积为:"+c1.computeArea());
System.out.print("第二个圆的直径为:"+c2.computeDiameter());
System.out.println(" 面积为:"+c2.computeArea());
System.out.print("第三个圆的直径为:"+c3.computeDiameter());
System.out.println(" 面积为:"+c3.computeArea());
}
}2007-11-03

/*
*Circle.java
*/

public class Circle{
private static float PI=3.14159f;
private float radius,area,diameter;
public Circle(){
radius=1;
}
public Circle(float r){
radius=r;
}
public float getRadius(){
return radius;
}
public void setRadius(float r){
radius=r;
}
public float computeDiameter(){
return 2*radius;
}
public float computeArea(){
return PI*radius*radius;
}
}

/*
*TestCircle.java
*/

public class TestCircle{
public static void main(String[] args){
Circle cir1,cir2,cir3;
cir1=new Circle();
cir2=new Circle();
cir3=new Circle();

cir1.setRadius(10);
cir2.setRadius(100);

System.out.println("The diameter of cir1 is:"+cir1.computeDiameter());
System.out.println("The area of cir1 is:"+cir1.computeArea());
System.out.println();

System.out.println("The diameter of cir2 is:"+cir2.computeDiameter());
System.out.println("The area of cir2 is:"+cir2.computeArea());
System.out.println();

System.out.println("The diameter of cir3 is:"+cir3.computeDiameter());
System.out.println("The area of cir3 is:"+cir3.computeArea());
System.out.println();
}
}2007-11-04

恩,,基础题应该自己做2007-11-03

真有给程序的啊2007-11-03

这么基础的题 为什么不自己做呢2007-11-03