circle.java

来自「tutorial for java programming」· Java 代码 · 共 42 行

// Exercise 7.1
public class Circle {
	//variables
	private double radius;
	private String color;
	
	//constructors
	public Circle(){//both initialize the radius and color
		radius = 1.0;
		color = "red";
	}
	public Circle(double radius){//radius specified and color default
		this.radius = radius;
		color = "red";
	}
	public Circle(double radius, String color){
		this.radius = radius;
		this.color = color;
	}
	//getters
	public double getRadius(){
		return radius;
	}
	public double getArea(){
		return radius*radius*Math.PI;
	}
	public String getColor(){
		return color;
	}
	//setters
	public void setRadius(double radius){
		this.radius = radius;
	}
	public void setColor(String color){
		this.color = color;
	}
	//toString
	public String toString(){
		return "Circle: radius=" + radius + " color=" + color;
	}
}