In java i create vehicle class and its object is v1 then i write a syntex System.out.println(v1); then output is

Question

vehicle@2a139a55 what is this please explain me.

Answer 1

The implementation of the toString method in class Object returns a string matching this pattern:
classname@objecthashcode.
To get a useful output, you have to override the toString method in your class, e.g.
@Override
public String toString() {
return name+" "+type; // just an example
}
Usually you return all attributes of your class from the overridden toString method, but you can return every string you want to.

Answer 2

you are printing an object (in your case v1).
the result is a string returned by the method v1.ToString()
this string is composed by the class name of the object, the @ sign and the unsigned hexadecimal representation of the hash code of the object

http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html#toString%28%29