What is the use of pattern in java?

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How can we make string upper case or lower case?

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Can we sort a map in java?

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Which java version is latest?

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Can a list be null in java?

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What type of variable is gender?

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What is oop principle 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 the logic inside any default constuctor?

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Convert Binary tree to linked list.

0 Answers   Amazon,

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Briefly explain the term Spring Framework

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Explain numeric promotion?

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