Please help me with these questions in Java. TIA

1-Implement the method printAll() for ThreeSum.java, which prints all of the triples that sum to zero.

2-Write a program FourSum.java that takes an integer reads long integers from standard input, and counts the number of 4-tuples that sum to zero. Use a quadruple nested loop. What is the order of growth of the running time of your program? Estimate the largest input size that your program can handle in an hour. Then, run your program to validate your hypothesis

3-Subset sum. Write a program SubsetSum.java that reads long integers from standard input, and counts the number of subsets of those integers that sum to exactly zero. Give the order of growth of your algorithm