Finde.java

package test;

public class Finde {

	public static void main(String[] args) {
	
		double[] numbers={1.0,7.0,9.0};
		double[] numbers1={};
		double[] numbers2={-1.0,7.0,9.2};
		
		double el=9.2;
		
		print(findElement(numbers,el));
		print(findElement(numbers1,el));
		print(findElement(numbers2,el));

	}
	static int findElement(double[]numbers,double el)
	{
		if(numbers==null || numbers.length==0)
			return -2;
		for(int i=0;i<numbers.length;i++)
		{
			if(numbers[i]==el)
				return i;
		}
		return-1;
	}
	 
	static void print(int number)
	{
		if(number==-2)
			System.out.println("Arrays not found!");
		else if(number==-1)
			System.out.println("Element not found!");
		else
			System.out.println("Number of element = "+number);
	}

}