package com.shrimpking.t1;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/9/11 10:46
 */
public interface Test
{
    void test();
}
package com.shrimpking.t1;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/9/11 10:47
 */
public class Tester
{
    public static long runTest(Test t){
        long start = System.nanoTime();
        t.test();
        long end = System.nanoTime();
        return end - start;
    }
}
package com.shrimpking.t1;

import sun.security.util.AuthResources_it;

import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Shrimpking
 * @create 2024/9/11 10:49
 */
public class TestMap
{
    public static <E> void testSuite(Map<Integer,String> map){
        long putTime,getTime,iterateTime;
        System.out.println("count\tputTime\tgetTime\titerateTime\t");

        //向映射中添加1000个元素
        putTime = Tester.runTest(new Test()
        {
            @Override
            public void test()
            {
                for (int i = 0; i < 1000; i++)
                {
                    map.put(i,"string");
                }
            }
        });

        //依次访问1000个元素
        getTime = Tester.runTest(new Test()
        {
            @Override
            public void test()
            {
                for (int i = 0; i < 1000; i++)
                {
                    map.get(i);
                }
            }
        });

        //
        iterateTime = Tester.runTest(new Test()
        {
            @Override
            public void test()
            {
                Set<Map.Entry<Integer,String>> entries = map.entrySet();
                for (Map.Entry<Integer,String> entry : entries){
                    Integer key = entry.getKey();
                    String value = entry.getValue();
                }
            }
        });

        System.out.printf("%d\t%d\t%d\t%d\n",1000,putTime,getTime,iterateTime);


    }

    public static void main(String[] args)
    {
        HashMap<Integer,String> hm = new HashMap<>();
        TreeMap<Integer,String> tm = new TreeMap<>();
        LinkedHashMap<Integer,String> lhm = new LinkedHashMap<>();

        System.out.println("Test HashMap:");
        testSuite(hm);
        System.out.println("----------------");
        System.out.println("Test TreeMap:");
        testSuite(tm);
        System.out.println("----------------");
        System.out.println("Test LinkedHashMap:");
        testSuite(lhm);

    }
}