Pleease need help!!!

Write a java program to do "infinite precision" integer multiplication. Given two integer arrays write a program to perform a multiplication (like you learned in elementary school). You should convert both input arrays and the answer to integers and verify that your program works. Print out a statement of the problem and its solution ("352 * 17 = XXXX"). You don't need to handle negative numbers. You are not allowed to use the java built-in classes (such as bigint).