Amplitude of Element In Unsorted Array

/*
The amplitude of a non-empty zero-indexed array A consisting of N numbers is defined as

amplitude(A) = max { A[P] - A[Q] : 0 <= P, Q < N }

Write a function

int amplitude(int[] A);

that given a non-empty zero-indexed array A consisting of N non-negative integers returns its amplitude. Assume that the length of the array does not exceed 1,000,000. Assume that each element of the array is a non-negative integer not exceeding 5,000,000.

For example, given array A such that

A[0]=10, A[1]=2, A[2]=44, A[3]=15, A[4]=39, A[5]=20

the function should return 42.

*/

Java Code

class array
{
public static void main(String a[])

{

System.out.println(amplitude(new int[]{10, 2, 44, 15, 39, 20}));

}

static int amplitude ( int[] A )
{
// write your code here
int min=A[0];
int max=A[0];
int diff=0;

if(A==null)
return 0;
if(A.length==0)
return 0;

if(A.length>1000000)
{
return 0;
}
else
{

for(int i=0;i {
if(A[i] min=A[i];
if(A[i]>max)
max=A[i];

diff=max-min;
}

}
return diff;
}

}