Several methods for converting object types to String Types __java Foundation

Method One: Using the Object.ToString () method
Example: Object object=getobject ();
System.out.println (Object.ToString ());
Note: If an object is null and is not instantiated, calling the method will report a null pointer exception

Method Two: Use coercion type conversion, which is to cast (String) before object
Example: Object object=getobject ();
System.out.println ((String) object);
Note: Not all types can be cast to string type, preferably with instanceof, such as: integer cannot be cast to string type
Integer integer=new integer (100);
(Object) integer;//compile an error
Object obj=new Integer (100);
(Object) obj;//run times wrong
But null can be cast to a string type
Method Three: Using string.valueof (Object obj), obj cannot be empty