Explain the difference between abstract class and interface in java?

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What does int [] mean in java?

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What is meant by structural programming?

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What is an event?

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Which collections are thread safe 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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Why string objects are immutable in java?

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Explain when classnotfoundexception will be raised ?

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what are the differences between java and .net?..why u choose java?

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Can extern variables be initialized?

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What type of variable is error flag?

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What is the structure of java?

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