Share three java code tutorials for generating random numbers

This article mainly introduces the method of generating random numbers in Java, which has a good reference value. Let’s take a look at it with the editor

1. Use System.currentTimeMillis() to get a long number of milliseconds in the current time.

　　long a = System.currentTimeMillis();
　　System.out.println(a);

2. Return a double value between 0 and 1 through Math.random().

　　int b = (int)(Math.random()*99+1);
　　System.out.println(b);

3. Generate a random number through the Random class.

Random random = new Random();
　　int c = random.nextInt(100)+1;
　　System.out.println(c);

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