Java生成随机数

Math.random() 会得到一个0-1之间的随机浮点数

public class HelloWorld {
    public static void main(String[] args) {
        int[] a = new int[5];
        a[0] = (int) (Math.random() * 100);
        a[1] = (int) (Math.random() * 100);
        a[2] = (int) (Math.random() * 100);
        a[3] = (int) (Math.random() * 100);
        a[4] = (int) (Math.random() * 100);
         
        System.out.println("数组中的各个随机数是:");
        for (int i = 0; i < a.length; i++)
            System.out.println(a[i]);