Object Class

Object Class:

Object:

an object is an instance of the class

Object Class:

It is Superclass for all the classes in java

Object class methods: equals(),hashcode(),toString(),finalize(),wait(),notify(),notifyall();

New operator is used to create a object

Constructor:

Constructor is used to initialize the instance variable/global variable

Garbage Collection:

A Garbage Collection is a process to remove the objects from heap memory which doesn’t have any references

Stack Memory: Stores reference variables

Heap Memory: Stores objects

GC will call finalize() before removing the objects.

Starting the GC Process: JVM runs the Garbage collection process

System.gc();

Runtime.gc();

It doesn’t guarantee that garbage process will start

we will just tell to JVM to start the process

Hashcode:

Hashcode is integer creates by JVM for each object

== is an operator used to check the memory address of the object

equals() used to check the content of the objects

Serializable is a marker interface

Marker interface which doesn’t have any methods

what are the other markable interfaces

Seriazable, Cloneable

Static Block:

It's executed when the class is loaded

Java static blocks will be called when JVM loads the class into memory, means it will be called only once. But constructor will be called every time when you create an object.