Sophie Sperner questions

• Find a supplement to a subarray of ints in Java
• Fastest strategy to form and sort an array of positive integers
• First Ever Java Program Incorrect Output
• Fastest Java HashSet<Integer> library [closed]
• Fastest way to recreate the ArrayList in a for loop
• Java best structure for 2D matrix of integers?
• How to run simple java app on amazon ec2?
• Check the existence of a HashMap key
• Memory size of a Java 32-bit system int[] array
• What is the hashCode for a custom class having just two int properties?

Sophie Sperner answers