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<init> method can be found in stacktrace, for example.
As I understood it represents initialization done in constructor.
If you try to execute
Object.class.getDeclaredMethod("<init>");
You'll get java.lang.NoSuchMethodException.
What is this method? When was it added to class? (in compilation - execution terms) Is it virtual, can one anyhow override it?
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Init method is a predefined method to initialize an object after its creation. Init method is a life cycle method for servlets for java. It is started by the browser when java program is loaded and run by the browser. Init method is a predefine method to initialize an object after its creation. Read More.
The __init__ method is the Python equivalent of the C++ constructor in an object-oriented approach. The __init__ function is called every time an object is created from a class. The __init__ method lets the class initialize the object's attributes and serves no other purpose. It is only used within classes.
Constructors. Python uses the fixed name __init__ for its constructor. Java has different notation: A method with the same name as the class, and no return value (not even void) is a constructor. Java constructors and instance methods headings do not include self like Python always has.
The init() method creates and loads the servlet. But the servlet instance is first created through the constructor (done by Servlet container). We cannot write constructors of a servlet class with arguments in servlet (It will throw Exception).
Have a look at the Java Virtual Machine Specification, chapter 2.9. It say on the <init> name:
At the level of the Java Virtual Machine, every constructor written in the Java programming language (JLS §8.8) appears as an instance initialization method that has the special name
<init>. This name is supplied by a compiler. Because the name is not a valid identifier, it cannot be used directly in a program written in the Java programming language.
That's why <init> can be found on the stack trace, but is not accessible with code.
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What is an
<init>method in Java?
It is a constructor. That's why you get a NoSuchMethodException when you try to call it as a method.
Can it be overriden?
No.
And if you see a <clinit> method, that is the classes static initialization "method".
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