paste the codes below and thanks

java programming

Question 1 [Name your file HW4_Q1.java) Write a program that reads a word and prints all substrings, sorted by length. For example, if the user provides the input "run", the program prints u ru um rum Question 2 [Name your file HW4_22.java] Write a program that reads an integer and displays, using asterisks, a filled and hollow square, placed next to each other. For example if the side length is 5, the program should display Question 3 [Name your file HW4_23.java] Write a method public static String repeat(String str, int n) that returns the string str repeated times. For example, repeat ("ho", 3) returns "hohoho