java-intercall-method

inf: http://www.javatpoint.com/understanding-toString()-method

package hellowworld;

class Student{
int rollno;
String name;
String city;


Student(int rollno, String name, String city){
this.rollno=rollno;
this.name=name;
this.city=city;
}

public String toString(){
 return rollno+"-"+name+" "+city;
}

public static void main(String args[]){
  Student s1=new Student(101,"Raj","lucknow");
  Student s2=new Student(102,"Vijay","ghaziabad");

  System.out.println(s1);//compiler writes here s1.toString()
  System.out.println(s2);//compiler writes here s2.toString()
}
}


result :
101-Raj lucknow
102-Vijay ghaziabad