How to use random class method in java

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:

Related learning recommendations: java basic tutorial

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