A constructor has the class name and no return type. Its job is to leave the new object in a valid state. Require the values you cannot do without, such as a student name, as parameters.
You can overload constructors. One can take a name, and another can take a name and a batch. this(name) from the second constructor calls the first and avoids copying the assignment lines.
Example
The constructor stores Weekday on the object. main then prints that field.
public class Batch {
String name;
Batch(String name) { this.name = name; }
public static void main(String[] args) {
Batch b = new Batch("Weekday");
System.out.println(b.name);
}
}If the parameter and the field share a name, this.name is the field and name is the parameter. Without this, the parameter is assigned to itself and the field stays null.
