1 String[] arr1 = new String[5];  2 String[] arr2 = {"a","b","c", "d", "e"};  3 String[] arr3= new String[]{"a","b","c","d","e"};  

1 int[] arr = { 1, 2, 3, 4, 5 };  2 String arrString = Arrays.toString(arr);  3    4 // 直接输出，为内存地址5 System.out.println(arr);  6 // [I@139a557    8 System.out.println(arrString );  9 // [1, 2, 3, 4, 5]  

1 String[] arr= { "a", "b", "c", "d", "e" };  2 boolean b = Arrays.asList(arr).contains("a");  3 System.out.println(b);  4 // true  

1 //使用Apache Commons Lang library2 3 1 int[] arr1 = { 1, 2, 3, 4, 5 };  4 2 int[] arr2= { 6, 7, 8, 9, 10 };  5 3 int[] combArr = ArrayUtils.addAll(arr1 , arr2); 

// System.arraycopy()
1 static String[] concat(String[] a, String[] b) {2       String[] c = new String[a.length + b.length];3       System.arraycopy(a, 0, c, 0, a.length);4       System.arraycopy(b, 0, c, a.length, b.length);5       return c;6  }

1 //Arrays.copyOf()2 3 public static int[] concat(int[] first, int[] second) {4     int[] result = Arrays.copyOf(first, first.length + second.length);5     System.arraycopy(second, 0, result, first.length, second.length);6     return result;7 }

1 // Apache Commons Lang library2 3 int[] arr= { 1, 2, 3, 4, 5 };  4 ArrayUtils.reverse(intArray);  5 System.out.println(Arrays.toString(intArray));  6 //[5, 4, 3, 2, 1]  

1 int[] arr = { 1, 2, 3, 4, 5 };2 int[] revArr = new int[arr.length];3 for(int i = 0; i < arr.length; i++){4     revArr[i] = arr[arr.length - i -1];5 }6 System.out.println(Arrays.toString(revArr));7 8 //[5, 4, 3, 2, 1]

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