本文分享了關(guān)于Java數(shù)組最頂級(jí)的11大方法，幫助你解決工作流程問題，無論是運(yùn)用在團(tuán)隊(duì)環(huán)境或是在私人項(xiàng)目中，你都可以直接拿來用！
0. 聲明一個(gè)數(shù)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(gè)數(shù)組（Print an array in Java）
int[] intArray = { 1, 2, 3, 4, 5 };
String intArrayString = Arrays.toString(intArray);
// print directly will print reference value
System.out.println(intArray);
// [I@7150bd4d
System.out.println(intArrayString);
// [1, 2, 3, 4, 5]
2. 從數(shù)組中創(chuàng)建數(shù)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. 檢查愛淘寶數(shù)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(gè)數(shù)組（ Concatenate two arrays）
int[] intArray = { 1, 2, 3, 4, 5 };
int[] intArray2 = { 6, 7, 8, 9, 10 };
// Apache Commons Lang library
int[] combinedIntArray = ArrayUtils.addAll(intArray, intArray2);
5. 聲明一個(gè)數(shù)組內(nèi)鏈（Declare an array inline ）
method(new String[]{"a", "b", "c", "d", "e"});
6. 將數(shù)組元素加入到一個(gè)獨(dú)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 lang
String j = StringUtils.join(new String[] { "a", "b", "c" }, ", ");
System.out.println(j);
// a, b, c
7. 將數(shù)組列表轉(zhuǎn)換成一個(gè)數(shù)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(shù)組轉(zhuǎn)換成一個(gè)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(shù)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(shù)組元素（Remove element of an array）
int[] intArray = { 1, 2, 3, 4, 5 };
int[] removed = ArrayUtils.removeElement(intArray, 3);
//create a new array
System.out.println(Arrays.toString(removed));
One more – convert int to byte array
byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();
for (byte t : bytes) {
System.out.format("0x%x ", t);
}