Functions of class inclusion in java

Functions of class inclusion in java

When writing a java program, we sometimes see this situation.

For example:

Class B {}

Class {}

New A (B) // in this statement, Class A contains Class B, meaning Class A can directly use Class B object class to call any data of Class B.

Here I give a metaphor to the human body.

For example, there is a human class person {}

There is a head class head {}

There is a body class body {}

There is a lower extremity class foot {}

Here we create a Head class

Head h = new head ();

One physical class

Body B = new body ();

One Lower Extremity

Foot f = new foot ();

Finally, create a human object.

Person p = new person (h, B, f );

In person, you can call any attributes of the header at will. In this way, you can divide this person into more details, you have to be more flexible.

I don't know if this is true or not!