Java runtime type recognition (rtti)

C ++'s runtime type recognition is clear, but Java is not familiar with it. Today, I had to go online and check Baidu, and soon I found the result.

Use the instanceof keyword to dynamically determine the instance type at runtime

The instance keyword in Java can be used to implement "Run-Time type identification" (rtti)

The Java instance keyword can be used to implement "Run-Time type identification (rtti)". That is to say, you can use the instanceof keyword to determine whether an object has no class instance. For example:

Class classa {
Classa (){
}
}

Class classb {
Classb (){
}
}

Public class myinstanceof {
Public static void main (string [] ARGs ){
Sayclass (New classa ());
Sayclass (New classb ());
}

Public static void sayclass (Object O ){
If (O instanceof classa)
System. Out. println ("this is classa ");
If (O instanceof classb)
System. Out. println ("this is classb ");
}
}

Output result:

This is classa
This is classb