Anonymous objects, Java

The concept of anonymous objects

　　an anonymous object is a statement that creates an object, but does not assign an object address value to a variable .

such as: A class that already exists:

public class person{

public void Eat () {

System.out.println ();

}

}

Create a Normal object

Person p = new person ();

Create an anonymous object

New Person ();

Characteristics of Anonymous objects

　　create anonymous objects directly using, without variable names .

The new person (). Eat ()//eat method is called by a person object that has no name.

An anonymous object can only be used once if its reference variable is not specified.

New person (). Eat (); Create an anonymous object, call the Eat method

New person (). Eat (); To re-create an anonymous object by calling the Eat method again

　　An anonymous object can be used as a parameter that is received by a method, a method return value

class Demo {

Public Static Person Getperson () {

Normal way

Person p = new person ();

return p;

Anonymous object as method return value

return New Person ();

}

Public Static void Method (person p) {}

}

class Test {

Public Static void Main (string[] args) {

Call the Getperson method to get a person object

Person person = Demo. Getperson ();

Call method Methods

Demo. Method (person);

An anonymous object is a parameter that is received as a method

Demo. Method (new person ());

}

}

Anonymous objects, Java