/** * 判断Collection(List和Set) 不为空 * * @param collection * List或Set类型的集合 * @return 如果collection不等于null且size>0,返回true;否则,返回false。 */ public static boolean notEmpty(Collection<?> collection) { return !isEmpty(collection); } /** * 判断map不为空 * * @param map * 键值对数据类型 * @return 如果map不为 null且size>0,返回true;否则,返回false。 */ public static boolean notEmpty(Map<?, ?> map) { return !isEmpty(map); } /** * 判断一个数组不为空。 * * @param array * 对象数组 * @return 如果数组为null或者数组元素个数为0,返回false;否则,返回true。 */ public static boolean notEmpty(Object[] array) { return !isEmpty(array); } } package cn.fansunion.webcommon.platform; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import junit.framework.TestCase; import org.junit.Test; import cn.fansunion.common.util.EmptyUtils; /** * * * @author leiwen */ public class EmptyUtilsTest extends TestCase { @Test public static void testCollectionIsEmpty() { List<Integer> list = Arrays.asList(1, 2, 3); boolean listWithPositiveSize = EmptyUtils.isEmpty(list); assertFalse(listWithPositiveSize); List<Integer> emptyList = new ArrayList<Integer>(); boolean listWithZeroSize = EmptyUtils.isEmpty(emptyList); assertTrue(listWithZeroSize); List<Integer> nullList = null; boolean nullEmpty = EmptyUtils.isEmpty(nullList); assertTrue(nullEmpty); Set<Integer> set = new HashSet<Integer>(); set.add(100); boolean setWithPositiveSize = EmptyUtils.isEmpty(set); assertFalse(setWithPositiveSize); Set<Integer> nullSet = null; assertTrue(EmptyUtils.isEmpty(nullSet)); Set<Integer> emptySet = new HashSet<Integer>(); assertTrue(EmptyUtils.isEmpty(emptySet)); } @Test public static void testMapIsEmpty() { Map<String, Object> map = new HashMap<String, Object>(); map.put("mapTest", "mapTestValue"); assertFalse(EmptyUtils.isEmpty(map)); Map<String, Object> nullEmpty = null; assertTrue(EmptyUtils.isEmpty(nullEmpty)); Map<String, Object> emptyMap = new HashMap<String, Object>(); assertTrue(EmptyUtils.isEmpty(emptyMap)); } @Test public static void testObjectArrayIsEmpty() { Integer[] array = { 1, 2, 3 }; assertFalse(EmptyUtils.isEmpty(array)); Integer[] nullArray = null; assertTrue(EmptyUtils.isEmpty(nullArray)); Integer[] emptyArray = {}; assertTrue(EmptyUtils.isEmpty(emptyArray)); } @Test public static void testCollectionNotEmpty() { List<Integer> list = Arrays.asList(1, 2, 3); boolean listWithPositiveSize = EmptyUtils.notEmpty(list); assertTrue(listWithPositiveSize); List<Integer> emptyList = new ArrayList<Integer>(); boolean listWithZeroSize = EmptyUtils.notEmpty(emptyList); assertFalse(listWithZeroSize); List<Integer> nullList = null; boolean nullEmpty = EmptyUtils.notEmpty(nullList); assertFalse(nullEmpty); Set<Integer> set = new HashSet<Integer>(); set.add(100); boolean setWithPositiveSize = EmptyUtils.notEmpty(set); assertTrue(setWithPositiveSize); Set<Integer> nullSet = null; assertFalse(EmptyUtils.notEmpty(nullSet)); Set<Integer> emptySet = new HashSet<Integer>(); assertFalse(EmptyUtils.notEmpty(emptySet)); } @Test public static void testMapNotEmpty() { Map<String, Object> map = new HashMap<String, Object>(); map.put("mapTest", "mapTestValue"); assertTrue(EmptyUtils.notEmpty(map)); Map<String, Object> nullEmpty = null; assertFalse(EmptyUtils.notEmpty(nullEmpty)); Map<String, Object> emptyMap = new HashMap<String, Object>(); assertFalse(EmptyUtils.notEmpty(emptyMap)); } @Test public static void testObjectArrayNotEmpty() { Integer[] array = { 1, 2, 3 }; assertTrue(EmptyUtils.notEmpty(array)); Integer[] nullArray = null; assertFalse(EmptyUtils.notEmpty(nullArray)); Integer[] emptyArray = {}; assertFalse(EmptyUtils.notEmpty(emptyArray)); } } |