ring.java

来自「实验 1 对象的创建和使用 ( l ）理解类的定义； ( 2 ）掌握对象的」· Java 代码 · 共 57 行

//Ring.java
public class Ring {
	private double innerRadius;

	private double outerRadius;

	public String color;

	public Ring(double iRadius, double oRadius, String c) {
		innerRadius = iRadius;
		;// 代码1 //初始化外半径
		innerRadius=iRadius;
		outerRadius=oRadius;
		color = c;
	}

	public double getInnerRadius() {
		return innerRadius;
		// 代码2 //返回内半径
	}

	public double getOuterRadius() {
		return outerRadius;
	}

	public void setInnerRadius(double iRadius) {
		innerRadius = iRadius;
	}

	public void setouterRadius(double oRadius) {
		outerRadius = oRadius;
	}

	public void setColor(String c) {
		color=c;
		;// 代码3 //设置颜色
	}

	public double getArea() {
		return (outerRadius * outerRadius - innerRadius * innerRadius) * 3.1415;
	}

	public static void main(String[] args) {
		Ring ring = new Ring(5, 8, "red");
		System.out.println("圆环的内半径：" + ring.getInnerRadius());
		System.out.println("圆环的外半径：" + ring.getOuterRadius());
		System.out.println("圆环的颜色：" + ring.color);
		System.out.println("圆环的面积：" + ring.getArea() + "\n");
		ring.setInnerRadius(4);
		ring.setouterRadius(6);// 代码4 //设置圆环ring的外半径为6
		ring.setColor("blue");
		System.out.println("圆环的内半径：" + ring.getInnerRadius());
		System.out.println("圆环的外半径：" + ring.getOuterRadius());
		System.out.println("圆环的颜色：" + ring.color);
		System.out.println("圆环的面积：" + ring.getArea());
	}
}