内存溢是指在无法回收内存或使用内存过多，最终使得应用程序运行需要用到的内存大于JVM虚拟机能够提供的最大内存
内存溢出的原因
1，内存中加载数据量过于大，如一次从数据库取出大量数据
2，集合类中对对象的引用，使用完未清空，使jvm不能回收
3，代码存在死循环或者循环过多产生太多对象实体
4，使用第三方应用的bug导致 消耗太多的内存
堆内存溢出
Exception in thread “main” java.lang.OutOfMemoryError: Java heap space
比如以下代码 不断的创建对象，这样就会导致堆内存溢出
package com.study.compare;import java.util.ArrayList;public class HeapOutOfMemory {public static void main(String[] args) {ArrayList list=new ArrayList();while (true){list.add(new Object());}}}运行一会就会出现堆内存溢出情况
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