triangle.java

基于mvc的一个测试三角形的jsp代码,输入三个数 可测试能否组成三角形 如果是则求出它的面积

package flower.grass;
public class Triangle
{  
	double sideA;
    double sideB;
    double sideC;
	
	public String is_triangle(String num1,String num2,String num3){
	String str=null;
	try{
		
		   sideA=Double.parseDouble(num1);
		    sideB=Double.parseDouble(num2);
		    sideC=Double.parseDouble(num3);
		if(sideA+sideB>sideC&&sideA+sideC>sideA&&sideA+sideC>sideB)
		    str="true";
		    else
		    	str="false";
}
	catch(Exception e){
		str="不能为空，请输入三个数字！";
	}
	 

return str;


}
	
	public String area(String num1,String num2,String num3)
	{
		String str1=null;
		
		System.out.println("num1:"+num1);
		System.out.println("num2:"+num2);
		sideA=Double.parseDouble(num1);
	    sideB=Double.parseDouble(num2);
	    sideC=Double.parseDouble(num3);
		
	    double p=(sideA+sideB+sideC)/2.0;
	    double area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));
	    System.out.println("area"+area);
	    str1=area+"";  
	     System.out.println("wq"+str1);
		return str1;
	}

}