本文分享了关于Java数组最顶级的方法,帮助你解决工作流程问题,无论是运用在团队环境或是在私人项目中,你都可以直接拿来用!
0. 声明一个数组(Declare an array)
String[] array01 = new String[5]; String[] array02 = new String[]{"a","b","c", "d", "e"}; String[] array03 = {"a","b","c","d","e"};
1. 在Java中输出一个数组(Print an array in Java)
int[] intArray01 = {1,2,3,4,5,6}; String intArrayStr = Arrays.toString(intArray01); System.out.println(intArray01);//[I@de6ced System.out.println(intArrayStr);//[1, 2, 3, 4, 5, 6]
2. 从数组中创建数组列表(Create an ArrayList from an array)
String[] strArray01 = {"a","b","c", "d", "e"}; ArrayList<String> list = new ArrayList<String>(Arrays.asList(strArray01)); System.out.println(list);//[a, b, c, d, e]
3. 检查数组中是否包含特定值(Check if an array contains a certain value)
String[] strArray02 = { "a", "b", "c", "d", "e"}; boolean b = Arrays.asList(strArray02).contains("b"); System.out.println(b);//true
4. 连接两个数组( Concatenate two arrays)
int[] intArray02 = {1,2,3,4,5}; int[] intArray03 = {6,7,8,9,10}; //// Apache Commons Lang library int[] combinedIntArray = ArrayUtils.addAll(intArray02, intArray03);
5. 声明一个数组内链(Declare an array inline )
method(new String[]{"a", "b", "c", "d", "e"});
6. 将数组元素加入到一个独立的字符串中(Joins the elements of the provided array into a single String)
// Apache common lang String str = StringUtils.join(new String[]{"a", "b", "c", "d", "e"}); System.out.println(str);//abcde
7. 将数组列表转换成一个数组 (Covnert an ArrayList to an array)
String[] strArray03 = {"a", "b", "c", "d", "e"}; ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(strArray03)); String[] strArray04 = new String[arrayList.size()]; arrayList.toArray(strArray04); for (String string : strArray04) { System.out.print(string+" ");//a b c d e }
8. 将数组转换成一个集合(Convert an array to a set)
String[] strArray05 = {"a", "b", "c", "d", "e"}; Set<String> set = new HashSet<String>(Arrays.asList(strArray05)); System.out.println(set);//[d, e, b, c, a]
9 反向数组(Reverse an array)
int[] intArray04 = {1,2,3,4,5,6}; ArrayUtils.reverse(intArray04); System.out.println(Arrays.toString(intArray04));//[6, 5, 4, 3, 2, 1]
10.删除数组元素(Remove element of an array)
int[] intArray05 = { 1, 2, 3, 4, 5 }; int[] removed = ArrayUtils.removeElement(intArray05, 3); System.out.println(ArrayUtils.toString(removed));//{1,2,4,5}