Constructed Types: Arrays and Classes

• Both mechanisms to deal with packaging of homogeneous and heterogeneous data
• An array is declared as follows:
  int intvec[];
  • Indicates that intvec is to be an array of integers
  • Size is not specified on the declaration
  • Actual details are specified when created:

    intvec = new int[200]; 	// to create the object anywhere, or
    int intvec[] = new int[200]; // to create the object where it is declared

  • Either one of these forms will create the space for 200 integers and associate it with intvec
  • The allocated size is also recorded
    • Both intvec[-1] and intvec[300] will generate a subscript range exception
    • Array length is accessible through the length instance variable (e.g. intvec.length)
• Arrays may be created for either built-in types or arbitrary object types:

  String NameTable[] = new String[1000];