Java member object inside a class of the same type

Question

I look at the codebase and I often see something like:

public class SomeClass
{
 protected static SomeClass myObject;

 //...

 public static SomeClass getObject()
 {
  return myOjbect
 }
}

I would like to make sure that I understand the purpose of this. Does this mean that one instance of the class is shared, even if it is created multiple times? I am not sure about this dictionary, otherwise I would be looking for an answer, so if this template has a name, please let me know.

Also, this seems like a small definition of chicken and egg, because a class includes an object of type class. Why is this not paradoxical?

Thank!

Answer 1

Singleton Pattern, . , , ( OO). Java AWT Swing, Frame/JFrame, main .

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Answer 2

Singleton.

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Answer 3

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Answer 4

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Answer 5

Singleton. (1) .

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public class SomeClass
{
 // Using private constructor
 protected static SomeClass myObject = new SomeClass();

 private SomeClass(){
 //...
 }

 public static SomeClass getObject()
 {
  return myOjbect
 }
}

, Wikipedia

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