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What is the purpose of the Runtime class? - The java runtime system can be accessed by the Runtime class...
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Difference between a static and a non-static inner class - Like static methods and static members are defined in a class, a class can also be static...
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Difference between the String and StringBuffer classes - String class is immutable. The characters of string objects can not be changed / modified...
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What is the Dictionary class? - The Dictionary class is an abstract class. The class maps keys to values...
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What is the ResourceBundle class? - A ResourceBundle is a group of related sub classes which are sharing the same base name...
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What is the Vector class? - The capability of implementing a growable array of objects is provided by the class Vector...
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What is the SimpleTimeZone class? - SimpleTimeZone is a concrete subclass of TimeZone class. The TimeZone class represents a time zone...
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What is the purpose of the System class? - System class is provided with useful fields (static members) that are pertaining to the environment...
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How are this() and super() used with constructors? - this() constructor is invoked within a method of a class, if the execution of the constructor is to be done before the functionality of that method...
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What is the purpose of finalization? - Finalization is the facility to invoke finalized() method. The purpose of finalization is to perform some action before the objects get cleaned up...
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Difference between the File and RandomAccessFile classes - The File class is used to perform the operations on files and directories of the file system of an operating system...
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Difference between StringBuilder and StringBuffer - StringBuffer is thread safe, where as StringBuilder is not. In other words, StringBuffer class is synchronized and StringBuilder class is not synchronized...
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Explain how to implement shallow cloning and deep cloning - Cloning is a process to create copies of objects...
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bstract class & Interfaces - An abstract class defines an abstract concept which can’t be instantiated...
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Java interface - An interface is a set of method definition without implementation. It is a protocol of...
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JAVA JVM and JIT - JVM is a virtual computer that runs the compiled java program. JVM is software that stays on the top...
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Java polymorphism - Capacity of a method to do different things based on the object that it is...
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Java class loaders - The class loader describes the behavior of converting a named class into the bits responsible for implementing that class...
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Java static and dynamic class - Dynamic class loading is achieved through Run time type identification. Also called as reflection...
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Java Comparator Interface - Comparators can be used to control the order of certain data structures and collection of objets too...
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Java autoboxing and unboxing - Explain autoboxing and unboxing, What is Auto boxing and unboxing?...
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Java Map and SortedMap - Maps are used to store the key-Value pairs...
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Explain the concepts of Externalizable Interface, Define the purpose of Externalizable Interface...
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When serializable interface is declared, the compiler knows that the object has to be handled so as so be able to serialize it...
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Java daemon threads - Threads that work in the background to support the runtime environment are called daemon threads...
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Javadoc utility enables you to keep the code and the documentation in sync easily. The javadoc utility lets you put your comments...
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Java StringBuilder & StringBuffer class - StringBuilder is unsynchronized whereas StringBuffer is synchronized. So when the application needs to be run only...
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Java semaphore and monitors - A semaphore is a flag variable used to check whether a resource is currently being used by another thread or process...
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Java checked and unchecked exception - The java.lang.Throwable class has two subclasses Error and Exception. There are two types of exceptions...
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Java inner classes - Types of inner classes - Local classes, Member classes, Anonymous classes...
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What is wrapper classes in Java?, Why do we need wrapper classes in Java?, Features of the Java wrapper Classes...
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Java error exception - Errors are abnormal conditions that should never occur. Not to be confused with the compile time errors....
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Java pre-emptive scheduling and time slicing - Under time slicing, a task executes for a predefined slice of time and then reenters the pool of ready tasks...
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Java serializable Interface - If we want to transfer data over a network then it needs to be serialized. Objects cannot be transferred as they are...
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Java thread synchronization - A Monitor defines a lock and condition variables for managing concurrent access to shared data...
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Java Swing - Classes in swing are not OS dependent. They don’t create peer components, so they are light weight unlike AWT...
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Java Stream Tokenizer - The StreamTokenizer class takes an input stream and parses it into " allowing the to be read one at a tokensname...
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Java getCodeBase & getDocumentBase - The getCodebase() method is also commonly used to establish a path to other files or folders that are in the same location as the class being run...
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