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What is comparable and comparator interface? List their differences
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What is remote method invocation (rmi)?
What is a boolean field?
What are identifiers in java?
If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?
Explain the concept of proper inheritance?
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What is difference between local variable and global variable?
import java.io.*; class Demo { public static void main(String args[]) { File f=new File("1234.msg"); String arr[]=f.list(); System.out.println(arr.length); } }
What is the different between get and post?
What is int short for?
when a request is generated from apache tomcat 5.5 and goes to oracle 10g or mysql,,, how the oracle or mysql reads the request as apache is a web server and oracle 10g is application server? when the oracle 10g provides response, how the apche tomcat reads it???
What does it mean that a method or field is “static”?
Why Static variable required in java?For ex,class A { static int a; int b; } Why static is required?
Core Java 
