Basic HTML version of Foils prepared 18 May 97

Foil 17 Java Language -- Types: Array

From Java Tutorial - Spring 1997 Part II: Java Language and Object-Oriented Concepts Peking Tutorial, Web Certificate -- Spring-Summer 1997. by Nancy J. McCracken,Geoffrey C. Fox


Arrays are "true" or "first class" objects in Java and no pointer arithmetic is supported.
An Array is declared as:
  • int vec[];
alternative syntax: int[] vec;
and created by:
  • vec = new int[128];
or concisely:
  • int vec[] = new int[128];
Arrays of arbitrary objects can be constructed,
  • e.g. Thread myThreadList[] = new Thread[1024];
  • The only difference is that in the case of primitive types, the array elements are actually allocated. In the case of arbitrary objects, an array of object references is created; before you use array elements, you must call the constructor of that type for each element.



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