0.  声明一个数组（Declare an array）
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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）
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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）
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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）
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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）
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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. 声明一个数组内链（Declare an array inline ）
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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）

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// 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）
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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）
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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）
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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）
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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
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byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();  
   
for (byte t : bytes) {  
   System.out.format("0x%x ", t);  
}  

0.  声明一个数组（Declare an array）
[js] view plaincopy
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）
[js] view plaincopy
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）
[js] view plaincopy
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）
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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）
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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. 声明一个数组内链（Declare an array inline ）
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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）

[js] view plaincopy
// 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）
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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）
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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）
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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）
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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
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byte[] bytes = ByteBuffer.allocate(4).putInt(8).array();  
   
for (byte t : bytes) {  
   System.out.format("0x%x ", t);  
}