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Wednesday, 31 August 2011
Tuesday, 30 August 2011
whai is set interface? java interview questions ...
Answer :
It has two useful concrete classes that implements sets
Example:
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
public class SetExample {
public static void main(String[] args) {
// Set example with implement TreeSet
Set<String> s=new TreeSet<String>();
s.add("b");
s.add("a");
s.add("b");
Iterator it=s.iterator();
while(it.hasNext())
{
String value=(String)it.next();
System.out.println("Value :"+value);
}
}
}
Output
Set Value :a
Set Value :b
set ignore the duplicate value.
- Java collections Set interface is part of java.util package.
- A set is a public interface that extends the collection interface
- It holds unique values(set does not contain duplicate elements).
It has two useful concrete classes that implements sets
- java.util.HashSet
- Set value can get by Iterator interface.
Example:
import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
public class SetExample {
public static void main(String[] args) {
// Set example with implement TreeSet
Set<String> s=new TreeSet<String>();
s.add("b");
s.add("a");
s.add("b");
Iterator it=s.iterator();
while(it.hasNext())
{
String value=(String)it.next();
System.out.println("Value :"+value);
}
}
}
Output
Set Value :a
Set Value :b
set ignore the duplicate value.
Monday, 29 August 2011
what is an interface? java interview questions ...
Ans:
syntax:
interface interface name{
//declaration of methods and constants
}
class class name implements{
//implementation codes
}
- An interface is a named collection of method declarations and constant declarations.
- here we only declare the methods not a implementation.
- it's implemented by a class using implements keyword.
syntax:
interface interface name{
//declaration of methods and constants
}
class class name implements{
//implementation codes
}
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