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Java uses random class methods: 1. Function [Random()] creates a new random number generator; 2. Function [Random(long seed)] uses a single long seed to create a new random number. Builder.
Java uses the random class method:
Directly use the Math.random()
method Method to generate random numbers.
//随机生成1~100之间的一个整数 int randomNumber = (int)(Math.random() * 100) + 1; System.out.println(randomNumber);
There are also methods using the Random class.
Random(): Creates a new random number generator.
Random(long seed): Creates a new random number generator using a single long seed.
The first construction method is to use the default number of milliseconds of the current system time as the seed number: Random r1 = new Random()
;
Random random = new Random(); int randomNumber1= random.nextInt(100);
The second method is to use the seed number specified by yourself
Random random1 = new Random(100); for(int i = 0; i < 10; i++){ System.out.print(random1.nextInt(10) + " "); }
It is found that as long as the seed number is consistent with the parameters in nextInt(), the random number generated will be the same every time (so this is a pseudo-random number ).
System.out.println("\n使用同一种子生成的随机数如下:"); Random random2 = new Random(100); for(int i = 0; i < 10; i++){ System.out.print(random2.nextInt(10) + " "); }
The screenshots are as follows:
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