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Collections can be of a particular type i.e they are only allowed to hold objects of a defined type. This is called “bounded by”. For example:

Java Code:

ArrayList  arrayList  = new  ArrayList();
Vector  vector  = new  Vector();

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We declared an ArrayList and a Vector both bounded by String. We cannot store objects other than String in these. Lets try to store an integer in Vector and see what happens.

Java Code:

Vector  vector  = new  Vector();

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Tags: bounded arraylist, collection

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Java SE