HashMap、TreeMap内存使用情况

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于 2014-08-05 10:41:24 发布 · 1.7k 阅读

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#java hashmap map siz

该博客通过Java代码展示了HashMap和TreeMap在存储10000个元素后的内存使用情况，经测试HashMap占用约578.23Kb，而TreeMap占用约592.35Kb。

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import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import net.sourceforge.sizeof.SizeOf;

public class MemeoryTestHashMapTreeMap {

	public static void main(String[] args) {
		SizeOf.skipStaticField(true); //java.sizeOf will not compute static fields
		SizeOf.skipFinalField(true); //java.sizeOf will not compute final fields
		SizeOf.skipFlyweightObject(true); //java.sizeOf will not compute well-known flyweight objects
		
		MemeoryTestHashMapTreeMap memTest=new MemeoryTestHashMapTreeMap();
		Map<String,List<String>> map;

		map = new HashMap<String, List<String>>();
		memTest.fillMap(map);
		System.out.println("HashMap:");
		System.out.println(memTest.getUsedMemeory(map)); 

		
		map = new TreeMap<String, List<String>>();
		memTest.fillMap(map);
		System.out.println("TreeMap:");
		System.out.println(memTest.getUsedM