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at:tutorial:symbiosis [2007/04/06 15:44] jdedeckerat:tutorial:symbiosis [2007/04/06 16:21] jdedecker
Line 18: Line 18:
  
 ===== Creating Java objects ===== ===== Creating Java objects =====
 +Creating a new instance of the Vector class is done by invoking the method new on the class object.
 +
 +<code>
 +>def aVector := Vector.new()
 +>><java:[]>
 +</code>
 +
 +All constructors defined in the corresponding Java class can be accessed too.  For example,  the Vector class also has a constructor that takes an initial capacity as its argument.  This constructor can be called using an integer as the argument of new.
 +
 +<code>
 +>aVector := Vector.new(30)
 +>><java:[]>
 +</code>
 +
 +===== Invoking methods on Java objects =====
 +In a similar fashion to calling constructors on Java classes we can also call other methods defined in the Java class.  For example, adding a elements to the vector can be done by invoking the add method.
 +
 +<code>
 +>1.to: 10 do: { |i| aVector.add(i) }
 +>>nil
 +>aVector
 +>><java:[1, 2, 3, 4, 5, 6, 7, 8, 9]>
 +</code>
  
-===== Using Java wrappers ===== 
  
 ===== Overloading ===== ===== Overloading =====
 +
 +===== Using Java wrappers =====
  
 ===== Symbionts ===== ===== Symbionts =====
at/tutorial/symbiosis.txt · Last modified: 2013/05/17 20:25 by tvcutsem