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摘要：关于自增长序列，昨天我回去尝试了下，可以实现代码项表--创建表 CREATE TABLE Code_Main (CodeID NUMBER PRIMARY KEY, CodeName VARCHAR2(50)); --建序列 CREATE SEQUENCE Code_Main_seq MINVALUE 1 MAXVALUE 9999999999 START WITH 1 INCREMENT BY 1 CACHE 30 ORDER; --建触発器 CREATE OR REPLACE TRIGGER Code_Main_tg BEFORE INSERT ON Code_Main... 阅读全文

摘要：class Producer implements Runnable{Q q;Producer(Q q){this.q=q;}public void run(){int i=0;while(true){synchronized(q){if(q.bFull)try{q.wait();}catch(Exception e){}if(i==0){q.name="Zhangsan";try{Thread.sleep(1);}catch(Exception e){}q.sex="male";}else{q.name="Lisi";q.sex=& 阅读全文

摘要：class Producer implements Runnable{Q q;Producer(Q q){this.q=q;}public void run(){int i=0;while(true){synchronized(q){if(i==0){q.name="Zhangsan";try{Thread.sleep(1);}catch(Exception e){}q.sex="male";}else{q.name="Lisi";q.sex="female";}}i=(i+1)%2;}}}class Consum 阅读全文

摘要：class ThreadDemo1{public static void main(String[] args){TestThread tt =new TestThread();new Thread(tt).start();try{Thread.sleep(1);}catch(Exception e){}tt.str=new String("method");new Thread(tt).start();}}class TestThread implements Runnable{String str=new String("");int tickets 阅读全文

摘要：//接口声明一些方法interface Car{public void run();public void stop();}//Benzclass Benz implements Car{public void run(){System.out.println("Benz Start...");}public void stop(){System.out.println("Benz Stop...");}}//Fordclass Ford implements Car{public void run(){System.out.println(" 阅读全文

摘要：一个类内部产生一个实例，节省内存空间，数据库连接，关闭中用到比较多class Single{//私有构造方法在外部不能被调用//只能在Single类内部实例化一个对象，然后调用private Single(){}private staticfinal Single sl=new Single();public static Single getSingleInstance(){return sl;}public void Say(){System.out.println("I can Speak");}}public class SingletonDemo{public s 阅读全文