<div onkeydown="javascript:if(event.keyCode==13) search()"> <br > ISBN<span style="color:red">*</span>:<input name="Text1" type="text" id="searchbox" value="-" > 书名&…

题目: The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an integer n, return all distinct solutions to the n-queens puzzle. Each solution contains a distinct board configuration…

//测试jdk代理机制 @Test public void testProxy(){ final UsbDisk usbDisk = new UsbDisk(); //类加载器,接口,匿名内部类 //disk是代理对象 Disk disk =(Disk) Proxy.newProxyInstance(usbDisk.getClass().getClassLoader() ,usbDisk.getClass().getInterfaces() , new InvocationHandler() {…

版本以及源的配置和控制节点一致 1.安装完操作系统已经apt源配置完成之后,一定要执行 apt-get update root@cloud:~# mv /etc/apt/sources.list /etc/apt/sources.list.bak #备份一下原来的源 root@cloud:~# vi /etc/apt/sources.list deb http://mirrors.163.com/ubuntu/ precise main restricted universe multivers…