Java Developer Jobs in Upper North Sydney, NS

Java is known as platform independent because it’s a compiled code (byte code) which can run in all operating systems.

Java Virtual Machine (JVM) is not a physical entity, it’s a virtual machine which acts as a processor and yes it is platform independent.

JVM (Java Virtual Machine) is virtual machine that, loads, verifies, executes and provides runtime environment, whereas JDK (Java Development Kit) is a physical entity which is used to develop Java applications and applets.

Java doesn’t support primitive datatype like int, char, float, bool, etc, hence is not a pure Object Oriented Language.

You can overload main method in Java from the entry point when the class is launched by the JVM (Java Virtual Machine), to overload, overloaded main method has to be called from inside the "public static void main (String args[])".

There are four types of garbage collectors in Java and they are

• Serial Garbage Collector
• Parallel Garbage Collector
• CMS Garbage Collector
• G1 Garbage Collector

Abstract class creates subclasses which can be implemented, whereas interface defines functionality that cannot be implemented.

A priority Queue is an abstract data type where the element with a higher level of priority is given more importance and served accordingly, rather than the lower priority element.

Reflection in API is used to examine the behavior of methods, classes and interfaces at runtime. It is important to

A Multi-catch block in Java is a block which performs different tasks at the occurrence of various exceptions and there is a condition where a multi-catch blocks are used, only one catch block can be executed at a time in multi-catch block.

A try statement which declares with one or more resource, where each resource is closed at the end of the statement is known as try-with-resources in Java. Once the execution leaves, try-with-resources block is automatically closed.

The benefit of composition over inheritance is it gives higher flexibility to the design and helps build business class domains naturally, rather than finding commonality between them and creating a family tree.

Block is used to perform synchronization on any specific resource of the method, and it is also used to lock an object for any shared resource.

The methods declared in Collection interface do not fit a Map interface, and Map interface methods do not fit with the collection interface, hence it doesn’t extend with each interface.