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  • 第四周动手动脑

     

    动手动脑一:纯随机数发生器

    复制代码
    package first;
    /*
     * 纯随机数发生器
     * 生成1000个随机整数
     */
    public class TestRandom {
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            long seed = System.currentTimeMillis();// 种子
            int i;
            int count = 0;
            // Modulus=231-1=int.MaxValue
            // Multiplier=75=16807
            long random = (16807 * seed) % Integer.MAX_VALUE;
            for (i = 1; i <= 1000; i++) {
                random = (16807 * random) % Integer.MAX_VALUE;
                System.out.print(random + " ");
                count++;
                if (count % 5 == 0)
                    System.out.println();
            }
        }
    }
    复制代码

    运行截图

    查看JDK中System.out.println()方法的部分内容 

    复制代码
     /**
         * Prints an integer and then terminate the line.  This method behaves as
         * though it invokes <code>{@link #print(int)}</code> and then
         * <code>{@link #println()}</code>.
         *
         * @param x  The <code>int</code> to be printed.
         */
        public void println(int x) {
            synchronized (this) {
                print(x);
                newLine();
            }
        }
       /**
         * Prints a String and then terminate the line.  This method behaves as
         * though it invokes <code>{@link #print(String)}</code> and then
         * <code>{@link #println()}</code>.
         *
         * @param x  The <code>String</code> to be printed.
         */
        public void println(String x) {
            synchronized (this) {
                print(x);
                newLine();
            }
        }
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  • 原文地址:https://www.cnblogs.com/Evak/p/9786957.html
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