1.  声明一个数组

String[] aArray = new String[5];  String[] bArray = {"a","b","c", "d", "e"};  String[] cArray = new String[]{"a","b","c","d","e"};

2.  输出一个数组

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]

3.  从一个数组创建数组列表

String[] stringArray = { "a", "b", "c", "d", "e" };      ArrayList
     
       arrayList = new ArrayList
      
       (Arrays.asList(stringArray));      System.out.println(arrayList);      // [a, b, c, d, e]
      
     

4.  检查一个数组是否包含某个值

String[] stringArray = { "a", "b", "c", "d", "e" };      boolean b = Arrays.asList(stringArray).contains("a");      System.out.println(b);      // true

5.  连接两个数组

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

6.  声明一个内联数组（Array inline）

method(new String[]{"a", "b", "c", "d", "e"});

7.  把提供的数组元素放入一个字符串

// 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

8.  将一个数组列表转换为数组

String[] stringArray = { "a", "b", "c", "d", "e" };      ArrayList
     
       arrayList = new ArrayList
      
       (Arrays.asList(stringArray));      String[] stringArr = new String[arrayList.size()];      arrayList.toArray(stringArr);      for (String s : stringArr)          System.out.println(s);
      
     

9.  将一个数组转换为集（set）

Set
     
       set = new HashSet
      
       (Arrays.asList(stringArray));      System.out.println(set);      //[d, e, b, c, a]
      
     

10.  逆向一个数组

int[] intArray = { 1, 2, 3, 4, 5 };      ArrayUtils.reverse(intArray);      System.out.println(Arrays.toString(intArray));      //[5, 4, 3, 2, 1]

11.  移除数组中的元素

int[] intArray = { 1, 2, 3, 4, 5 };      int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array      System.out.println(Arrays.toString(removed));

12.  将整数转换为字节数组

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