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Abstract - How do you make object
If all the methods in the Abstract class is defined, then it is a Abstract class? And can we make object out of it?
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Sort an Arraylist having Group of Objects
Employee object having emp name, emp id, emp salary... An arraylist has a list of employee object.How will you sort this arraylist?
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Hashmap and Hashtable
which one is better and faster between hashmap and hashtable? Explain the situation where you would use them ?
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What is the difference b/w Iterator & ListIterator
Iterator : Enables you to cycle through a collection,obtaining or removing elementsListIterator :It extends Iterator allow bidirectional traversal of list & the modification of element
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Object Creation
In how many ways we can create an object? Explain with example.
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Multiple Interface
Why do we need interface concept instead of multiple inheritance? What is the drawback when we use the multiple inheritance?
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What is collection framework?what interfaces and classes support collection framework?
One can use different groups of objects in program using collection frame work.for more detail readcollection frame work from java.util pack.
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Importance of java.lang.obj
What is the significance of java.lang.object class?
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Implement and Extend Keywords
What is the implement, what is the extend keyword, what is the difference, give me answers in briefly ?
Core Java Interview Questions
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