The definition of java-based array

1. The array definition format is divided into dynamic and static

　　　　(1) static initialization format: two kinds

　　　　　　Data Type [] = new Array Name Data Type [] {element 1, element 2, element 3 ...}

　　　　　　Example //
　　　　　　int [] arr = new int [  ] {10,20,30,40};

　　　　　　Data Type [] = {array name element 1, element 2, element 3 ...};

　　　　　　Example //
　　　　　　int [] arr = {10,20,30,40} ;

　　　　Dynamic Definition Format (2) of the array

• • • Data Type [] = new Array name Data type [array length];

    •  Data type variable name [] = new data type [array size]; Learn to

    • // dynamic array initialization

    • Example //
      // int 3 is defined as the length of the array
      int [] arr = new int [ 3];

      // define the length of the double array 5
      double [] arr = new double [ 5];

      // define the length of an array of char 5
      char [] arr = new char [ 5];

      // define the length of the array of strings 4
      String [] arr = new String [ 4];

　　　　(3) the characteristics of the index value of the array?

　　　　　　　　Array index is starting from 0, +1 each time.