Answer / meena

1. Elimination repeated sub-expressions.
2. Eliminating the dead- code.
3. Replacing multiplication and division by bit shift operators.

Answer / guest

Using Design Patterns Such as FlyWeight.
Use of static variables when-ever possible
using StringBuffer instead of String coz they are immutable
Using interfaces for reducing coupling
Avoiding creating new objects, reusing existing ones

Which oo concept is achieved by using overloading and overriding?

0 Answers  

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How to sort a collection of custom Objects in Java?

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In Inheritance if we are implementing Multi level inheritance and all class having same name of variable and now i want to access each class variable and how it is possible?

2 Answers  

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what is main difference b/w abstract class and interface

4 Answers  

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What does math floor () do?

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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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How do you make an arraylist empty in java?

0 Answers  

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What is a lambda expression ? What's its use ?

0 Answers  

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what is the difference between sleep() and Wait()?

10 Answers   Accenture, Amdocs,

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What are the advantages of arraylist over arrays?

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Which software is used for java programming?

0 Answers  

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Can you call a private data from an inner class?

6 Answers  

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