#core java questions

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what is the meaning of System.out.println

  Every java programmer, while starting the journey of alphabets, would be similar to the terms System.out.println(“hello world”);, which literally marks the beginning into the java programming world. Initially, i understood that to log, we may need to use these terms, in congestion of printf or cout in other programming languages. Actual meaning of System.out.println…

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Java Constructors and its need of access modifiers

We know that Constructor are for defining or initializing variables when the object is created. Also that they are the first method to be called when the object gets created. We also know the basics Constructor name must be same as its class name Constructor must have no explicit return type We know the types…

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Marker Interfaces and Annotations in java

we all know marker interface – An interface with no methods. Example: Serializable, Remote, Cloneable. The marker interface also defines a type. It can thus be used in method signatures. For example, Hibernate’s Session.get() method takes a Serializable as argument. It avoids passing a primary key that would not be serializable as argument. Note that…

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Java Basics Quiz

Related Post Membership Catalog Java Date Calculations scala trait and abstract class When only to prefer LinkedList over ArrayList

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Basic String Operations Quiz

Related Post Java Null and empty string scala functions and methods FastDateFormat How to Difference between java.util.Date and java.sql.Dat…

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Java Queue Stack

Java provides a Stack class, which can be found within the java.util namespace. Within the same namespace you will find a Queue interface. All concrete Queue implementations can be located within the java.util.concurrent package. What is a Stack? Java’s Stack class extends the Vector class. A Stack represents a Collection of objects that are in…

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Java Null and empty string

Null has no bounds, it can be used for string, integer, date, etc. fields. Empty string is just regarding a string; it’s a string like “abcd” is, but is just has no length. If you have no value for a field, use null, not an empty string. Null is an absence of a value. An…

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Java Serial Version UID

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