第四周動手動腦

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動手動腦一：純隨機數發生器

package first;/* * 純隨機數發生器 * 產生1000個隨機整數 */public class TestRandom {    public static void main(String[] args) {        // TODO Auto-generated method stub        long seed = System.currentTimeMillis();// 種子        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();        }    }}

運行

查看JDK中System.out.println()方法的部分內容 

 /**     * 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();        }    }

第四周動手動腦