Storing a reference to the String object as type Object : Class Object « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Class Object

A variable of type Object can store a reference to an object of any class type.

public class MainClass {
  public static void main(String[] a) {
    String saying = "A stitch in time saves nine.";
    Object str = saying;
    System.out.println(str);
    System.out.println(str.getClass().getName());
  }
}

A stitch in time saves nine.
java.lang.String