Question

Java

Answer 1

Answer:

public class Lab10

{

//Constants

private final static String NAME = "John Terry"; // replace YOUR NAME with your name

private final static int STUID = 123456789;

private final static double GPA1 = 4.00;

private final static double GPA2 = 2.34;

//main method

public static void main (String[] args)

{

Student stu1;

stu1 = new Student(NAME, STUID, GPA1);

System.out.println("\nName: " + stu1.getName());

System.out.println("Id Number: " + stu1.getIdNum());

System.out.println("GPA : " + stu1.getGPA());

stu1.setGPA(GPA2);

System.out.println(stu1 + "\n");

// Create a second student object

// With a name of Trine Thunder, a

// gpa of 4.00, and a student Id of

// 000000001

// You do not need to declare these at final constants,

// but you can if you want to.

System.out.println("\nName: Trine Thunder" );

System.out.println("Id Number: 000000001");

System.out.println("GPA : 4.00");

Student stu2 = new Student("Trine Thunder",000000001, 4.00 );

// [Add code here]

// Print out this student similar to above.

// You do not need to reset the gpa of this student.

System.out.println(stu2 + "\n");

// [Add code here]

// Check if both objects are same using == and .equals() methods.

// Print the message in both cases, whether same or not as shown in sample output.

System.out.println("Using ==");

if(stu1 == stu2){

System.out.println("Both are same");

}

else{

System.out.println("Both are different");

}

stu1.equals(stu2);

// [Add code here]

} // end of main

} // end of class Lab10

// Name:

// Section:

// Lab 10

// CS1113

// Fall 2016

// Class : Student.java

public class Student

{

//class variables

private String name;

private int idNum;

private double gpa;

// Constructor

public Student(String namePar, int idNumPar, double gpaPar)

{

// Save namePar to class variable name

name = namePar;

// [Add code here]

idNum = idNumPar;

// Save idNumPar to class variable idNum

gpa = gpaPar ;

// [Add code here]

// Save gpaPar to class variable gpa

// [Add code here]

}

// Accessor: returns name of student

public String getName()

{

// Return the name of the student

return name;

// [Add code here]

}

// Accessor: returns GPA of student

public double getGPA()

{

// Return the gpa of the student

return gpa;

// [Add code here]

}

// Accessor: returns idNum of student

public int getIdNum()

{

// Return the idnum of the Student

return idNum;

// [Add code here]

}

// Mutator: Changes the GPA of the student

public void setGPA(double g)

{

// Set the class variable gpa equal to g

gpa = g;

// [Add code here]

}

// toString method: Returns a formatted string

// of student information.

// As shown in sample output.

public String toString()

{

// declare a String variable to store the string value

// then return the formatted String.

String s ="";

s = s + "Student Name: "+name+"\n";

s =s + "Student Id num: "+idNum+"\n";

s =s + "Student GPA: "+gpa+"\n";

return s;

// [Add code here]

}

// implement .equals() method which returns a boolean value

// of student information. When you call this method,

// it should print message as shown in sample output.

public boolean equals(Student s)

{

//[Add code here]

System.out.println("Using .equals() method");

if(this.equals(s.idNum == this.idNum)){

System.out.println("Both are same");

return true;

}

else{

System.out.println("Both are different");

return false;

}

}

} // end of class Student

Explanation:

Output:

Name: John Terry

Id Number: 123456789

GPA : 4.0

Student Name: John Terry

Student Id num: 123456789

Student GPA: 2.34

Name: Trine Thunder

Id Number: 000000001

GPA : 4.00

Student Name: Trine Thunder

Student Id num: 1

Student GPA: 4.0

Using ==

Both are different

Using .equals() method

Both are different