triangle.java

加密解密技巧

package zuoye.entity;

public class Triangle extends Shape {
	private double s1;
	private double s2;
	private double s3;
	
	public Triangle(double s1, double s2, double s3) {
		super();
		this.s1 = s1;
		this.s2 = s2;
		this.s3 = s3;
	}
	public Triangle() {
		super();
		// TODO Auto-generated constructor stub
	}
	public double girth(){// s1+s2+s3
		
		return this.s1+this.s2+this.s3;
	}
	public void area(){// s*h/2
		double m = 0;
		m = (this.s1+this.s2+this.s3)/2;
		System.out.println(Math.sqrt(m*(m-this.s1)*(m-this.s2)*(m-this.s3)));
	}
}