Give output of the following method definition and also write the mathematical operation they carry out:

void test2(int a, int b)
{
    while( a != b)
    {
      if ( a > b)
        a = a — b;
      else
        a = b — a;  
    }
    System.out.println(a);
}

if 4 and 17 are passed to the function.

Give output of the following method definition and also write the mathematical operation they carry out:

void test1(int n)
{
for(int x=1; x<=n; x++)
if(n%x == 0)
    System. out.println(x);
}

if 12 is passed to n.

Give output of the following method definition and also write the mathematical operation they carry out:

void test4(String x, String y)
{
    if(x.compareTo(y) > 0)
        System.out.println(x);
    else
        System.out.println(y);
}

if "AMIT" and "AMAN" are passed to the method.