第四周动手动脑
动手动脑一:纯随机数发生器
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(); } } }
运行截图
查看JDK中System.out.println()方法的部分内容
/** * 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(); } }