Explain about oops concepts.

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INTERVIEW QUESTION FOR ANDROID

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Are functions objects in java?

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public class AboutStrings{ public static void main(String args[]){ String s1="hello"; String s2="hel"; String s3="lo"; String s4=s2+s3; //to know the hash codes of s1,s4. System.out.println(s1.hashCode()); System.out.println(s4.hashCode()); // these two s1 and s4 are having same hashcodes. if(s1==s4){ System.out.println("s1 and s4 are same."); }else System.out.println("s1 and s4 are not same."); } } Somebody told me that, == operator compares references of the objects. In the above example even though s1 and s4 are refering to same object(having same hash codes), it is printing s1 and s4 are not same. Can anybody explain in detail why it is behaving like this? Thanks in Advance RavuriVinod

4 Answers   TCS,

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What is string and its types?

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How to create two different thread class inside a main function?

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What modifiers are used with a top level class?

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What is an inner class in java?

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Can a abstract class be defined without any abstract methods?

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Can singleton class be cloned?

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What is thread safe singleton?

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What is finalize()? Is finalize() similar to a destructor?

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