collectionutilstests.java

spring的源代码

/*
 * Copyright 2002-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.util;

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 junit.framework.TestCase;

/**
 * @author Rob Harrop
 */
public class CollectionUtilsTests extends TestCase {

	public void testIsEmpty() {
		assertTrue(CollectionUtils.isEmpty((Set)null));
		assertTrue(CollectionUtils.isEmpty((Map)null));
		assertTrue(CollectionUtils.isEmpty(new HashMap()));
		assertTrue(CollectionUtils.isEmpty(new HashSet()));

		List list = new ArrayList();
		list.add(new Object());
		assertFalse(CollectionUtils.isEmpty(list));

		Map map = new HashMap();
		map.put("foo", "bar");
		assertFalse(CollectionUtils.isEmpty(map));
	}

}