Help with a java program problem

Using jGrasp and the Software Development Kit, write a program in response to the following prompt:

Write a program that declares an array "alpha" of 50 elements of type "double".  Initialize the array so that the first 25 elements are equal to the square of the index variable and the last 25 elements are equal to three times the index variable. Output the array so that 10 elements per line are printed.