我是菜鸟啊啊啊

Mac and JDKjava 1.6java_home /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Homejava 1.7 and 1.8java_home /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home 1.8对应相应的版本号就行

import java.util.*; public class Test { public static void main(String[] args) { // Map<String,Object> hashMap = new HashMap<>(16); // for(int i=0;i<10000;i++){ // ...