1 package com.zhouyy.netBank.util;
2
3 import java.util.*;
4
5 /**
6 * 判断工具类
7 */
8 public class EmptyUtils {
9
10 /**
11 * 如果字符串为空或空串返回
12 *
13 * @param str
14 * @return boolean
15 */
16 public static boolean isBlank(String str) {
17 return StringUtils.isBlank(str);
18 }
19
20 /**
21 * 字符串不为空返回true
22 *
23 * @param str
24 * @return boolean
25 */
26 public static boolean isNotEmpty(String str) {
27 return StringUtils.isNotEmpty(str);
28 }
29
30 /**
31 * 如果字符串为空返回
32 *
33 * @param str
34 * @return boolean
35 */
36 public static boolean isEmpty(String str) {
37 return StringUtils.isEmpty(str);
38 }
39
40 /**
41 * 判断对象、String、Long、Integer 是否为空
42 *
43 * @param obj
44 * @return boolean
45 */
46 public static boolean isEmpty(Object obj) {
47 return obj == null;
48 }
49
50 public static boolean isEmpty(Integer obj) {
51 return obj == null;
52 }
53
54 public static boolean isEmpty(Double obj) {
55 return obj == null;
56 }
57
58 public static boolean isEmpty(Float obj) {
59 return obj == null;
60 }
61
62 public static boolean isEmpty(Long obj) {
63 return obj == null;
64 }
65
66 public static boolean isEmpty(Byte obj) {
67 return obj == null;
68 }
69
70 public static boolean isEmpty(Date obj) {
71 return obj == null;
72 }
73
74 public static boolean isEmpty(Object[] obj) {
75 return null == obj || obj.length == 0;
76 }
77
78
79 /**
80 * 如果List为空返回
81 *
82 * @param result
83 * @return boolean
84 */
85 public static boolean isEmptyList(List<?> result) {
86 return isEmpty(result);
87 }
88
89 /**
90 * 判断是否为数值类型
91 *
92 * @param str
93 * @return boolean
94 */
95 public static boolean isNumeric(String str) {
96 try {
97 if(isBlank(str)){
98 return false;
99 }
100 double a = Double.parseDouble(str);
101 return true;
102 } catch (NumberFormatException e) {
103 return false;
104 }
105 }
106
107 /**
108 * 判断数组是否为空
109 *
110 * @param obj
111 * @return boolean
112 */
113 public static boolean isEmptyArray(Object[] obj) {
114 return isEmpty(obj);
115 }
116
117 /**
118 * 判断List、Map是否为空
119 *
120 * @param collection List、Map
121 * @return boolean
122 * @author zhouyy
123 */
124 public static boolean isEmpty(Collection collection) {
125 return (collection == null || collection.isEmpty());
126 }
127
128 /**
129 * 判断List、Map是否不为空
130 *
131 * @param collection List、Map
132 * @return boolean
133 * @author zhouyy
134 */
135 public static boolean isNotEmpty(Collection collection) {
136 return !isEmpty(collection);
137 }
138
139 /**
140 * 如果字符串为空返回
141 *
142 * @param str
143 * @return boolean
144 */
145 public static boolean isEmpty(StringBuilder str) {
146 return null == str || isBlank(str.toString());
147 }
148
149 /**
150 * 删除List中重复元素
151 *
152 * @param list
153 */
154 public static void removeDuplicate(List list) {
155 HashSet h = new HashSet(list);
156 list.clear();
157 list.addAll(h);
158 }
159
160 /**
161 * 删除List中重复元素，保持顺序
162 * @param list
163 */
164 public static void removeDuplicateWithOrder(List list) {
165 Set set = new HashSet();
166 List newList = new ArrayList();
167 for (Iterator iter = list.iterator(); iter.hasNext(); ) {
168 Object element = iter.next();
169 if (set.add(element)) {
170 newList.add(element);
171 }
172 }
173 list.clear();
174 list.addAll(newList);
175 }
176 }