本文分享了關於Java數組最頂級的11大方法,幫助你解決工作流程問題,無論是運用在團隊環境或是在私人項目中,你都可以直接拿來用!
0. 聲明一個數組(Declare an array)
String[] aArray = new String[5];String[] bArray = {"a","b","c", "d", "e"};String[] cArray = new String[]{"a","b","c","d","e"};
1. 在Java中輸出一個數組(Print an array in Java)int[] intArray = { 1, 2, 3, 4, 5 };String intArrayString = Arrays.toString(intArray); // print directly will print reference valueSystem.out.println(intArray);// [I@7150bd4d System.out.println(intArrayString);// [1, 2, 3, 4, 5]
2. 從數組中創建數組列表(Create an ArrayList from an array)String[] stringArray = { "a", "b", "c", "d", "e" };ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));System.out.println(arrayList);// [a, b, c, d, e]
3. 檢查數組中是否包含特定值(Check if an array contains a certain value)String[] stringArray = { "a", "b", "c", "d", "e" };boolean b = Arrays.asList(stringArray).contains("a");System.out.println(b);// true
4. 連接兩個數組( Concatenate two arrays)int[] intArray = { 1, 2, 3, 4, 5 };int[] intArray2 = { 6, 7, 8, 9, 10 };// Apache Commons Lang libraryint[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
5. 聲明一個數組內鏈(Declare an array inline )method(new String[]{"a", "b", "c", "d", "e"});
6. 將數組元素加入到一個獨立的字符串中(Joins the elements of the provided array into a single String)
// containing the provided list of elements// Apache common langString j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");System.out.println(j);// a, b, c
7. 將數組列錶轉換成一個數組 (Covnert an ArrayList to an array)String[] stringArray = { "a", "b", "c", "d", "e" };ArrayList<String> arrayList = new ArrayList<String>(Arrays.asList(stringArray));String[] stringArr = new String[arrayList.size()];arrayList.toArray(stringArr);for (String s : stringArr) System.out.println(s);
8. 將數組轉換成一個集合(Convert an array to a set)Set<String> set = new HashSet<String>(Arrays.asList(stringArray));System.out.println(set);//[d, e, b, c, a]
9. 反向數組(Reverse an array)int[] intArray = { 1, 2, 3, 4, 5 };ArrayUtils.reverse(intArray);System.out.println(Arrays.toString(intArray));//[5, 4, 3, 2, 1]
10. 刪除數組元素(Remove element of an array)int[] intArray = { 1, 2, 3, 4, 5 };int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new arraySystem.out.println(Arrays.toString(removed));
One more – convert int to byte arraybyte[] bytes = ByteBuffer.allocate(4).putInt(8).array(); for (byte t : bytes) { System.out.format("0x%x ", t);}
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