Vectors

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• Vectors

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Vectors

• Class in the java.util package
• Growable Object arrays
• ONLY OBJECTS CAN BE ADDED TO VECTORS!
• Recall
• All object classes inherit from the Object class
• So any object type can be added to the vector,
  but the vector does not keep track of this type.

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Vectors

• Vector v new Vector( )
• Vector v new Vector(10)
• Vector v new Vector(10, 10)
• Wanderer w1 new Wanderer( )
• Wanderer w2 new Wanderer( )
• v.add(w1)
• v.add(w2)
• Wanderer w3 v.get(0)

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Vectors

• There are many other ways may want to add and
  remove Objects in the vector.
• See the java API

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Vectors

• What if you want primitives in Vectors?
• Use wrapper classes
• Integer class
• Double class
• int x 7
• int y 3.0
• Integer i new Integer(x)
• Double d new Double(y)
• v.add(i)
• v.add(d)
• See java API

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Vectors

• Questions?