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);      }

 

 

  转自： 【ITEYE】http://www.iteye.com/news/28296