Apache CollectionUtils使用指南

import org.apache.commons.collections.CollectionUtils;

import org.apache.commons.collections.MapUtils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.MapUtils;
import org.junit.Assert;
import org.junit.Test;

/**
 * 测试Empty
 *
 * @author bash
 * @version V1.0
 * @since 2015-11-12 10:50
 */
public class CollectionUtilSample {

    @Test
    public void testEmpty() {

        Map<String, String> emptyMap = new HashMap<>();
        List<String> emptyList = new ArrayList<>();
        Set<String> emptySet = new HashSet<>();

        Assert.assertTrue(MapUtils.isEmpty(emptyMap));
        Assert.assertTrue(CollectionUtils.isEmpty(emptyList));
        Assert.assertTrue(CollectionUtils.isEmpty(emptySet));
    }
}