Convert from Decimal to Binary, Octal or Hex using java

Use Integer.toString(int input, int radix) to convert from an Integer to any type of base number.

Integer decimal1 = 21;

String binaryNumber = Integer.toString(decimal1, 2);

System.out.println(decimal1 + " in Base 2 : " + binaryNumber);

Integer decimal2 = 302;

String octalNumber = Integer.toString(decimal2, 8);

System.out.println(decimal2 + " in Base 8 : " + octalNumber);

Integer decimal3 = 43981;

String hexNumber = Integer.toString(decimal3, 16);

System.out.println(decimal2 + " in Base 16 : " + hexNumber);

Output:

21 in Base 2 : 10101

302 in Base 8 : 456

43981 in Base 16 : abcd