toString() method is very useful and frequently used by java developer. What is toString() ?

As per java doc: 'toString() method returns the string representation of the object.'

toString() method belongs to Object class, So each and every object in java has toString() method. When you print any object in java, java compiler by default return object.toString().

example:-

class Student{

        public static void main(String args[]){  
            Student s1=new Student(); 
            System.out.println(s1);//compiler prints it as  s1.toString()   
         }
        }

output: Student@1fee8fc

Out put divided in two parts one part before @ which represent Class name of object , and second part after @ represent unsigned hexadecimal code of the object.
How to take advantages of toString() ? - Java developer can takes advantage of toString() method , By overriding the toString() method of the Object class, we can return values of the object, so we don't need to write much code.
example:-

class Student{  

         String info = "Developer" ;

          public String toString(){//overriding  
          return info;  
         }  
         public static void main(String args[]){ 

            Student s1=new Student(); 
            System.out.println(s1);//compiler prints it as  s1.toString()  

         }
        }       

output: Developer