Computer science

Write a substring method that accepts a string str and an integer idx and returns the substring contained between 0 and idx-1 inclusive. Do NOT use any of the existing substring methods in the String, StringBuilder, or StringBuffer APIs. Write a program to determine if an integer is even without using the modulus operator (%) Sort two employees based on their name, department, and age using the Comparator interface. Write a program that stores the following strings in an ArrayList and saves all the palindromes in another ArrayList. "karan", "madam", "tom", "civic", "radar", "jimmy", "kayak", "john", "refer", "billy", "did" Create an ArrayList which stores numbers from 1 to 100 and prints out all the prime numbers to the console. Find the minimum of two numbers using ternary operators