Data Bank | Yazilim Ders

What is the Lifecycle Stages of JSP ?

JSP has following lifecycle stages...

What are the Advantages of Using JSP in Web Architecture ?

We get following advantages by using JSP in web architecture...

How Can You Determine If Your Program Has a Deadlock in Java ?

If we suspect that our application is stuck due to a Deadlock, then we just take a thread dump by using the command specific...

235 Java

Why an Object Used as Key in HashMap Should Be Immutable in Java ?

The Key object should be immutable so that hashCode() method always return the same value for that object...

243 Java

How Will You Make an Object Immutable in Java ?

To make an object immutable follow these two rules. One, do not use any setter methods that can change the fields...

234 Java

Why Should You Define a Default Constructor in Java ?

In general, Java provides a default constructor with each class. But there are certain cases when we want to...

239 Java

Why Does Java Provide Default Constructor ?

In Java all the interaction takes place between Object instances. To create an Object instance, JVM needs...

226 Java

What is the Reason to Organize Classes and Interfaces in a Package in Java ?

As the name suggests, a package contains a collection of classes. It helps in setting the category of a file...

216 Java

Why Do You Use Upcasting or Downcasting in Java ?

When we want to cast a Sub class to Super class, we use Upcasting. It is also known as widening. Upcasting is always allowed in Java...

256 Java

What is the Difference Between a Class and an Object in Java ?

A Class is a template or a blue print of an Object to be created. An Object is an instance of a Class. A Class...

219 Java

Why String Class is Immutable or Final in Java ?

Since String objects are cached in a String pool, it makes sense to make the String immutable. The cached String...

232 Java

What is the Difference Between a Cookie and a Session Object in Java ?

Both Cookie and Session are used during communication between Client and Server. The Client can disable...

224 Java

When Do You Use Exception or Error in Java ?

Throwable class is the superclass of Exception and Error classes in Java...

217 Java

How Can You Make an Object Eligible for Garbage Collection in Java ?

To make an Object eligible for Garbage collection, just make sure that it is unreachable to the program in which...

215 Java

Why Collection Interface Doesn’t Extend Cloneable and Serializable Interfaces in Java ?

Collection interface just specifies groups of objects known as elements. Each concrete implementation of a Collection...

251 Java

What is the Difference Between pass by reference and pass by value in Java ?

Whenever an object is passed by value, it means that a copy of the object is passed. Even if changes are...

248 Java

Enumeration and Iterator, Which One Has Better Performance in Java ?

Enumeration interface is a read-only interface. It has better performance than Iterator. It is almost twice as fast...

225 Java

What is the Difference Between DOM and SAX Parser in Java ?

In Java, Document Object Model (DOM) parser loads the whole XML into memory and creates a tree based...

245 Java

How Can We Print an Array in Java ?

We can print an array by using methods of Arrays class. We can either use Arrays.toString() method or we can...

223 Java

What is a Compile Time Constant in Java ?

A compile time constant is public static final variable. The public modifier is optional here. At compile time, they...