The Collections and Arrays classes in Java

Collections

• Collections is a specialized static class under java.util that contains various static methods for collection operations. Provides a series of static methods to search, sort, and thread-safe various collections.

  public static void main(String[] args) {
      List list = new ArrayList();
      list.add(17);
      list.add(11);
      list.add(65);
      list.add(36);
  
      Collections.sort(list);
  
      System.out.println(list);//[11, 17, 36, 65]
  }
  Copy the code

Arrays

• Arrays is a special java.util static class that contains Arrays of related operations that provide static methods for searching, sorting, copying, and so on.

  public static void main(String[] args) {
      int[] array = new int[]{11, 4, 23, 16, 3, 1, 4};
  
      Arrays.sort(array);
      System.out.println(Arrays.toString(array));//[1, 3, 4, 4, 11, 16, 23]
  }
  Copy the code