Java面试题

JDK和JRE的区别？

<span style="color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-variant-ligatures: normal; orphans: 2; widows: 2;">解释下Servlet的生命周期？</span><br>

<span style="color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-variant-ligatures: normal; orphans: 2; widows: 2;">HTTP响应的结构是怎么样的？</span>

<span style="color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-variant-ligatures: normal; orphans: 2; widows: 2;">什么是cookie？session和cookie有什么区别？</span>

<span style="color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-variant-ligatures: normal; orphans: 2; widows: 2;">sendRedirect()和forward()方法有什么区别？</span>

Java类的初始化顺序

<strong style="margin: 0px; padding: 0px; font-family: 'microsoft yahei'; font-size: 14px; line-height: 25px;">LinkedList，ArrayList，<span style="color: rgb(51, 51, 51); font-family: 'Helvetica Neue', Helvetica, Tahoma, Arial, STXihei, 'Microsoft YaHei', 微软雅黑, sans-serif; font-size: 16px; font-weight: normal; line-height: 27.2px; text-indent: 16px; background-color: rgb(254, 254, 254);">Vector</span>的实现原理，底层数据结构，以及使用场景</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">Enumeration和Iterator接口的区别？</strong>

遍历一个List的集中方式？有哪些

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">为何Iterator接口没有具体的实现？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">hashCode()和equals()方法有何重要性？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">HashMap和HashTable有何不同？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">如何决定选用HashMap还是TreeMap？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">ArrayList和Vector有何异同点？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">Array和ArrayList有何区别？什么时候更适合用Array？</strong>

<strong style="border: 0px; margin: 0px; padding: 0px; font-size: 14px; color: rgb(0, 0, 0); font-family: 'Microsoft YaHei', 宋体, 'Myriad Pro', Lato, 'Helvetica Neue', Helvetica, Arial, sans-serif; font-variant-ligatures: normal; orphans: 2; widows: 2;">ArrayList和LinkedList有何区别？</strong>

<strong style="margin: 0px; padding: 0px; font-family: 'microsoft yahei'; font-size: 14px; line-height: 25px;">HashMap，TreeMap，HashTable的实现原理</strong>

Java中的策略模式是什么？在Jdk中哪里有体现

为什么100等于100，而1000等于1000

什么是JSR,JSR的标准有哪些？