synmemidgenerator.java

来自「采用JAVA开发」· Java 代码 · 共 30 行

package com.gctech.util;

/**
 * <p>Title: 同步的内存ID生成器。</p>
 * <p>Description: 工具类</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: GCTech</p>
 * @author 王红宝
 * @version $Id: SynMemIDGenerator.java,v 1.1.1.1 2004/04/21 09:30:42 wanghb Exp $
 */

public class SynMemIDGenerator implements IDGenerator {
  int seq = 0;
  public SynMemIDGenerator() {

  }
  public synchronized int nextInt() {
    seq++;
    //保证是正的
    if( seq == 0x7fffffff )
      seq = 1;
    return seq;
  }
  public static void main(String[] args) {
    System.out.println(Integer.toBinaryString(0x80000000));
    System.out.println(0x80000001);
    System.out.println(0xffffffff);
  }

}