public class Student
{

    public String name;
    public int age;
    public String city;

    public Student(String name, int age)
    {
        this.name = name;
        this.age = age;
    }

    public Student(String name, int age, String city)
    {
        /*
         * The this() constructor call should be used to reuse the constructor
         * in the constructor. It maintains the chain between the constructors
         * i.e. it is used for constructor chaining.
         * 
         * Now no need to initialize name and age.
         */
        this(name, age);
        this.city = city;
    }

}