# 直接拿来用！超实用的Java数组技巧攻略

#### 发表于2013-09-16 10:28| 次阅读| 来源CSDN| 0 条评论| 作者夏梦竹

0.  声明一个数组（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中输出一个数组（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. 从数组中创建数组列表（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. 检查数组中是否包含特定值（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. 连接两个数组（ Concatenate two arrays）

```int[] intArray = { 1, 2, 3, 4, 5 };
int[] intArray2 = { 6, 7, 8, 9, 10 };
// Apache Commons Lang library
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）

```// 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. 将数组列表转换成一个数组 （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. 将数组转换成一个集合（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. 反向数组（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. 删除数组元素（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);
}```

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