Java programming

Question

Create student class in Java with roll no, name, and address as the attribute. Also create methods to

insert value in the attributes. Declare all the variables to be public. Also try inserting values in the class

without using the member methods. Write down your observation.

Answer 1

class Student

{

public long rollNo;

public String name;

public String addr;

public Student() { rollNo=0; name=addr=""; }

public Student( long lNum, String strName, String strAddr)

{

rollNo = lNum;

name = new String(strName);

addr = new String(strAddr);

}

public Student(Student student)

{

this.name = new String(student.name);

this.addr = new String(student.addr);

this.rollNo = student.rollNo;

}

public void SetRollNum(long lNum) { rollNo = lNum; }

public void SetName(String strName) { name=new String(strName); }

public void SetAddress(String strAddr) { addr = new String(strAddr); }

public long GetRollNum() { return(rollNo); }

public String GetName() { return(name); }

public String GetAddress() { return(addr); }

@Override public String toString()

{

return(

new String(

(new Long(rollNo)).toString() + "," + name + "," + addr

)

);

}

public static void main(String args[])

{

Student xStudent = new Student();

Student yStudent = new Student();

Student zStudent = new Student(54321,"Charlie","123 south st");

//public members can be directly accessed

xStudent.name = "Albert";

xStudent.rollNo = 43210;

xStudent.addr = "321 North St";

//uses public setters

yStudent.SetName("Bob");

yStudent.SetRollNum(65432);

yStudent.SetAddress("210 West St.");

//copy constructor

Student copyStudentX = new Student(xStudent);

System.out.println(xStudent); System.out.println("\n\n");

System.out.println(yStudent);System.out.println("\n\n");

System.out.println(zStudent);System.out.println("\n\n");

System.out.println(copyStudentX);System.out.println("\n\n");

}

}