// Iterator - Returns an iterator over the elements in this list in proper sequence. System.out.println("\n===> 3. Iterator Example..."); Iterator<String>crunchifyIterator = crunchifyList.iterator(); while(crunchifyIterator.hasNext()){ System.out.println(crunchifyIterator.next()); } //...
Since Java 5,java.uti.concurrentpackage has lots of useful but complex classes to work on concurrent applications.CountDownLatchis one of those classes which are highly asked in any Java interview with big corporates. In this tutorial,CountDownLatchis explained with examples and concepts around it...
An iterator in Java provides the means to access elements of a collection one-by-one in a sequential, unidirectional and non-repeatable manner. This is useful in cases when the size of the collection is not known beforehand or when the collection does not expose suitable methods to access a ...
Thejava.util.ArrayListprovides O(1) time performance for replacement, similar tosize(),isEmpty(),get(),iterator(), andlistIterator()operations which runs in constant time. Now, you may wonder that whyset()gives O(1) performance butadd()gives O(n) performance, because it could trigger res...
How does a realm know how to authenticate a user? Well, it contains all user names and passwords of valid users or it has access to the store that holds them. Where this information is stored depends on the realm implementation. In Tomcat, by default valid users are stored in the tomcat...
package org.apache.catalina; import java.io.IOException; import java.security.Principal; import java.util.Iterator; import javax.servlet.ServletException; import javax.servlet.http.HttpSession; public interface Session { public static final String SESSION_CREATED_EVENT = "createSession"; public static ...
3.Check before casting.As a best practice, if you’re going to cast, you should check first.Recent versions of Javaimproved the syntax. For example, you could downcastUnittoUnitImpllike this: Unitunit=casted.iterator().next()if(unitinstanceofUnitImpl implementation) {// …}else{// ...}...
Check if Iterator is valid Check if the value exist in the Registry. child process limits in service context and conhost.exe chkstk.asm is throwing an unhandled exception at start up cl.exe can't find stdlib.h on a 64 bit machine? CL.EXE parameter to specify output path cl.exe: how ...
For any given file, Write a Java program to find a line with maximum number of words in it is a very common interview question. In other words, write a
import java.security.Principal; import java.util.Iterator; import javax.servlet.ServletException; import javax.servlet.http.HttpSession; public interface Session { public static final String SESSION_CREATED_EVENT = "createSession"; public static final String SESSION_DESTROYED_EVENT = ...