12 best Practices for Java arrays

1. Declaring an array

    New String[5];       = {"A", "B", "C", "D", "E"};       New String[]{"A", "B", "C", "D", "E"};  

2. Output an array

    int [] Intarray = {1, 2, 3, 4, 5 };       = arrays.tostring (intarray);              // Print directly would print reference value       System.out.println (intarray);       // [email protected  ]           System.out.println (intarraystring);       // [1, 2, 3, 4, 5]  

3. Creating an array list from an array

String[] Stringarray = {"A", "B", "C", "D", "E" }; ArrayListNew arraylist<string>(arrays.aslist (Stringarray)); System.out.println (arrayList); // [A, B, C, D, E]

4. Check if an array contains a value

    String[] Stringarray = {"A", "B", "C", "D", "E" };       Boolean b = arrays.aslist (Stringarray). Contains ("a");      System.out.println (b);       // true  

5. Connect two arrays

    int [] Intarray = {1, 2, 3, 4, 5 };       int [] IntArray2 = {6, 7, 8, 9, ten };       // Apache Commons Lang library      int [] Combinedintarray = Arrayutils.addall (Intarray, intArray2);  

6. Declares an inline array (array inline)

    Method (new string[]{"A", "B", "C", "D", "E"});  

7. Put the supplied array elements into a 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  

8. Converting an array list to arrays

    String[] Stringarray = {"A", "B", "C", "D", "E" };      ArrayListNew arraylist<string>(arrays.aslist (Stringarray));       New string[arraylist.size ()];      Arraylist.toarray (Stringarr);        for (String S:stringarr)          System.out.println (s);  

9. Converting an array to set (set)

    New Hashset<string>(Arrays.aslist (Stringarray));      SYSTEM.OUT.PRINTLN (set);       // [D, E, B, C, a]  

10. Reverse an array

    int [] Intarray = {1, 2, 3, 4, 5 };      Arrayutils.reverse (intarray);      System.out.println (arrays.tostring (Intarray));       // [5, 4, 3, 2, 1]  

11. Move the elements in the divisor group

int [] Intarray = {1, 2, 3, 4, 5 }; int [] removed = Arrayutils.removeelement (Intarray, 3); // Create a new array System.out.println (arrays.tostring (removed));

12. Converting integers to byte arrays

    byte [] bytes = Bytebuffer.allocate (4). Putint (8). Array ();               for (byte  t:bytes) {         System.out.format ("0x%x", T);      }  

12 best Practices for Java arrays