1. Initialize Array

int[] array = new int[size];

2. Copy an Array

int[] newArray = oldArray.clone();

3. Conversions

• String to Character Array
  char[] arr = str.toCharArray();
• Character Array to String
  String str = new String(char[] arr);
• Integer to String
  String str = Integer.toString(int n);
• String to Integer
  int n = Integer.parseInt(String str);
• Integer to Binary String
  String str = Integer.toBinaryString(int n);
• Get number of set bits in a integer
  int n = Integer.bitCount(int x);