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1 package com.service.base; 2 3 public class Actor extends Thread { 4 5 @Override 6 public void run() { 7 8 System.out.println(getName()+"是一个演员!"); 9 10 b... 阅读全文
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1 package com.service.cone; 2 3 public class EnergySystem { 4 5 //总能量 6 private final double[] energyBoxs; 7 8 private final Object obj = new Object(); 9 10 //个数... 阅读全文
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1 public class Singleton { 2 3 private static Singleton singleton ; 4 5 private Singleton(){} 6 7 public static Singleton getInstance(){ 8 9 if(single... 阅读全文
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JDBC (Java Data Base Connection,java数据库连接) JDBC(Java Data Base Connection,java数据库连接)是一种用于执行SQL语句的Java API,可以为多种关系数据库提供统一访问,它由一组用Java语言编写的类和接口组成.JDBC提供 阅读全文
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select * from (select p.province_name, p.province_code, c.city_name, c.city_code, c.city_id, ROW_NUMBER() OVER(PARTITION B... 阅读全文