對比一下anyMatch和contains

package com.cyh.java8;

import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;

public class Demo {

	private static List<Integer> list = new ArrayList<>(5);

	@BeforeClass
	public static void init(){
		for (int i = 0; i < 50000000; i++) {
			list.add(i);
		}
	}

	/**
	 * anyMatch 方法測試
	 */
	@Test
	public void comparison(){
		//數據在1萬如下  contains快於anyMatch	特別是在中位數時明顯快於anyMatch
		List<Long> ls = new ArrayList<>(16);
		/*List<Integer> collect = list.stream().limit(10000).collect(Collectors.toList());
		ls.add(System.currentTimeMillis());
		if (collect.stream().anyMatch(x->x.intValue()==1000)) {
			ls.add(System.currentTimeMillis());
		}
		if (collect.stream().anyMatch(x->x.intValue()==5000)) {
			ls.add(System.currentTimeMillis());
		}
		if (collect.stream().anyMatch(x->x.intValue()==9000)) {
			ls.add(System.currentTimeMillis());
		}


		if (collect.contains(1000)) {
			ls.add(System.currentTimeMillis());
		}

		if (collect.contains(5000)) {
			ls.add(System.currentTimeMillis());
		}

		if (collect.contains(9000)) {
			ls.add(System.currentTimeMillis());
		}

		statistics(ls);*/
		/*
		 * 3
		 * 2
		 * 1
		 * 2
		 * 0
		 * 1
		 */

	/*	List<Integer> col = list.stream().limit(100000).collect(Collectors.toList());
		ls.add(System.currentTimeMillis());
		if (col.stream().anyMatch(x->x.intValue()==10000)) {
			ls.add(System.currentTimeMillis());
		}
		if (col.stream().anyMatch(x->x.intValue()==50000)) {
			ls.add(System.currentTimeMillis());
		}
		if (col.stream().anyMatch(x->x.intValue()==90000)) {
			ls.add(System.currentTimeMillis());
		}


		if (col.contains(10000)) {
			ls.add(System.currentTimeMillis());
		}

		if (col.contains(50000)) {
			ls.add(System.currentTimeMillis());
		}

		if (col.contains(90000)) {
			ls.add(System.currentTimeMillis());
		}
		statistics(ls);*/
		/*
		 10
		 19
		 18
		 1
		 3
		 4
		 */
		/*List<Integer> lst = list.stream().limit(1000000).collect(Collectors.toList());
		ls.add(System.currentTimeMillis());

		if (lst.stream().anyMatch(x->x.intValue()==100000)) {
			ls.add(System.currentTimeMillis());
		}
		if (lst.stream().anyMatch(x->x.intValue()==500000)) {
			ls.add(System.currentTimeMillis());
		}
		if (lst.stream().anyMatch(x->x.intValue()==900000)) {
			ls.add(System.currentTimeMillis());
		}


		if (lst.contains(100000)) {
			ls.add(System.currentTimeMillis());
		}

		if (lst.contains(500000)) {
			ls.add(System.currentTimeMillis());
		}

		if (lst.contains(900000)) {
			ls.add(System.currentTimeMillis());
		}
		statistics(ls);*/
		/*
		26
		28
		27
		2
		6
		2
		 */
		List<Integer> lst = list.stream().limit(10000000).collect(Collectors.toList());
		ls.add(System.currentTimeMillis());

		if (lst.stream().anyMatch(x->x.intValue()==1000000)) {
			ls.add(System.currentTimeMillis());
		}
		if (lst.stream().anyMatch(x->x.intValue()==5000000)) {
			ls.add(System.currentTimeMillis());
		}
		if (lst.stream().anyMatch(x->x.intValue()==9000000)) {
			ls.add(System.currentTimeMillis());
		}


		if (lst.contains(1000000)) {
			ls.add(System.currentTimeMillis());
		}

		if (lst.contains(5000000)) {
			ls.add(System.currentTimeMillis());
		}

		if (lst.contains(9000000)) {
			ls.add(System.currentTimeMillis());
		}
		statistics(ls);
/**
 * 42
 * 42
 * 86
 * 11
 * 21
 * 13
 */
	}

	private void statistics(List<Long> ls){
		for (int i = 0; i < ls.size(); i++) {
			if (i>=1) {
				long l1 = ls.get(i) - ls.get(i - 1);
				System.out.println(l1);
			}
		}
	}
}