java random

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Random rand = new Random();
int num = rand.nextInt(100); // 0-99 (inclusive)

Random rand = new Random(System.currentTimeMillis());
int num = rand.nextInt(100);

Random rand = new Random(); // creating Random object
System.out.println(rand.nextFloat()); // displaying a random float value between 0.0 and 1.0

String guid = UUID.randomUUID().toString();