How can i convert the object to class~~~????

recently i develop UML drawing tool for drawing UML diagram, i now design a program structure. now i have already defined many classes that represent each shape in UML. each class stores data of the related shape. then i use a vector to store all shape as follow;
Vector shape = new Vector();
shape.addElement(useCase); \\useCase is a Class i defined
shape.addElement(actor);\\actor is a Class i defined
now i want to use all shape's methods stored in the vector before how can i do that in general ways?
i don't want to code like this;
Object o = shape.elementAt(a);
if (o instanceof UseCase)
if (o instanceof Actor)
because i have many classed!! can u all professional help me? i am just a beginer of java programming student

Sounds like you need to use an inheritance structure...
Setup a generic class that contains methods (probably blank) which each class (such as actor, useCase) will inherit from. Then make actor/useCase inherit from this base class and provide specific code in each of the general methods.
Then when you retrieve your object from the class, you can cast it as your generic class and access the general methods without caring what the actual class is.
Eg. Basic class "shape". has empty methods "draw" and "setPosition". Class "circle" and "square" both extend "shape" and provide specific implementations of setPosition and draw methods. You can then cast them as class type shape and do draw() and setPosition methods without caring about what type the object actually is.

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How can i convert the object to class~~~????

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