Implement a stack with push (), pop() and min() in O(1) time.

0 Answers   Amazon,

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Explain Stream Tokenizer?

4 Answers  

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Differece between class and generic class?

0 Answers   Tech Mahindra,

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Name some OOPS Concepts in Java?

0 Answers  

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Is vector synchronized in java?

0 Answers  

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Can we catch more than one exception in single catch block?

0 Answers  

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What do you mean by static variable?

0 Answers   TCS,

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What are predicates in java 8?

0 Answers  

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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 does 3 dots mean in java?

0 Answers  

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What is the purpose of object oriented programming?

0 Answers  

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What is a flag and how does it work?

0 Answers  

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