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45 lines (39 loc) · 1.19 KB
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package com.ufclub.ljs.autoInvest.model.AutoInvestSettingcom.JVM.stack;
/**
* @author chenssy
* @date 2016/11/19
* @since v1.0.0
*/
public class StackGCTest {
//如果一个局部变量被保存在局部变量表中，那么GC就能引用到这个局部变量所指向的内存空间
//从而在GC时，可能无法回收这部分空间
public static void test1(){
{
byte[] bytes = new byte[6 * 1024 * 1024];
}
System.gc();
System.out.println("first explict gc over");
}
//手工释放该空间，将变量设置为null
public static void test2(){
{
byte[] bytes = new byte[6 * 1024 * 1024];
bytes = null;
}
System.gc();
System.out.println("first explict gc over");
}
//或者重新声明一个新的局部变量，从而复用该变量的字，使其所占有的空间可以被GC回收
public static void test3(){
{
byte[] bytes = new byte[6 * 1024 * 1024];
}
int a = 0;
System.gc();
System.out.println("first explict gc over");
}
public static void main(String[] args){
test1();
// test2();
}
}