computearea.java

来自「大学java作业源程序」· Java 代码 · 共 32 行

package problem_1;
//ComputeArea.java
import java.io.*;

public class ComputeArea {
	private double radius;
	private double area;
	
	public ComputeArea(double radius){
		this.radius = radius;
		area = Math.PI * this.radius * this.radius;
	}
	
	//返回面积
	public double getArea(){
		return area;
	}
	
	public static void main(String[] args){
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			System.out.print("Radius = ");
			Double radius = Double.valueOf(br.readLine());	//读入半径
			ComputeArea circle = new ComputeArea(radius);
			System.out.println("Area = " + Double.toString(circle.getArea()));	//输出circle面积
		}
		catch(IOException e){
			System.out.println(e);
		}
	}
}