The difference between the Class.isassignablefrom (Class Clz) method and the Instanceof keyword

Class.isassignablefrom () is a subclass or interface that is used to determine whether a class Class1 and another class Class2 are the same or another class.
The format is:
Class1.isassignablefrom (CLASS2)
Both the caller and the parameter are java.lang.Class types.
andinstanceofis used to determine whether an object instance is an instance of a class or interface or its subclass sub-interface.
The format is: o instanceof TypeName
   The first parameter is the object instance name, and the second parameter is the specific class name or interface name, for example,   String,inputstream. Java code    package com.bill99.pattern;      public class  assignabletest {              public  Assignabletest (string name)  {       }        /**       *  Determine whether a class is a parent of another class        *  is print true       *  no print false       */       public static void testisassignedfrom1 ()  {            system.out.println ("String is the parent class of object:" +string.class.isassignablefrom ( Object.class);       }       /**        *  determine whether a class is a parent class of another class        *  is print true       *  no print false        */       public static void testisassignedfrom2 ()  {            system.out.println ("object is a string's parent class:" + Object.class.isAssignableFrom (String.class));       }        /**       *  Determine if a class is the same as another class        *   Print true       *  no print false       */        PUBLIC STATIC VOID TESTISASSIGNEDFROM3 ()  {            system.out.println ("Object and object are the same:" +object.class.isassignablefrom ( Object.class);       }          /**       *  determine if STR is an instance of object class        *  is print true        *  no print false       */        Public static void testinstanceof1 ()  {            string str = new string ();            system.out.print ("Str is an instance of object:");            System.out.println (str instanceof object);       }        /**       *  judgment O is an instance of object class         *  print true       *  no print false       */        public static void testinstanceof2 ()  {      &nbsP;    object o = new object ();            system.out.print ("O is an instance of object:");            system.out.println (o instanceof object);       }               public static void main ( String[] args)  {           testisassignedfrom1 ();            testisassignedfrom2 ();            TESTISASSIGNEDFROM3 ();            testinstanceof1 ();           testinstanceof2 ();        }  }  

Results:

String is the parent class of object: False
object is the parent class of string: True
object is the same as object: True
STR is an instance of object: True
O is an instance of object: True