Bifalgorithm post · Computer science one · Example

What does the completed Java Student class example contain?

What does the completed Java Student class example contain? (Computer science one · Example) — "We present the full and completed Student class in Code Sample…

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Completed Java Student class
Student data fields
firstName and lastName store the student's names
id stores the student's identifier
gpa stores the student's grade point average
Student constructors
The full constructor initializes the name, ID, and GPA
The no-argument constructor initializes null names, ID 0, and GPA 0.0
The two-name constructor initializes the names with default ID and GPA values
Accessor methods
Getter methods return the first name, last name, ID, and GPA
getFormattedName returns the name as Last, First
getGpaAsPercentage scales the GPA from a 4.0 scale to a percentage
Object representation and comparison methods
toString returns a formatted representation containing the name, ID, and GPA
hashCode computes a hash from the names, GPA, and ID
equals compares Student objects by their names, GPA, and ID

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What does the completed Java Student class example contain?

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Computer science one

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sam23

Ebook2w

"We present the full and completed Student class in Code Sample 34.1.\n\npackage unl.cse;\n\npublic class Student {\n\nprivate String firstName;\n\nprivate String lastName;\n\nprivate int id;\n\nprivate double gpa;\n\npublic Student(String firstName, String lastName, int id, double gpa) {\n\nthis.firstName = firstName;\n\nthis.lastName = lastName;\n\nthis.id = id;\n\nthis.gpa = gpa;\n\n}\n\npublic Student() {\n\nthis(null, null, 0, 0.0);\n\n}\n\npublic Student(String firstName, String lastName) {\n\nthis(firstName, lastName, 0, 0.0);\n\n}\n\npublic String getFirstName() {\n\nreturn firstName;\n\n}\n\npublic String getLastName() {\n\nreturn lastName;\n\n}\n\npublic int getId() {\n\nreturn id;\n\n}\n\npublic double getGpa() {\n\nreturn gpa;\n\n}\n\n/**\n\n* Returns a formatted String of the Student's\n\n* name as Last, First.\n\n*/\n\npublic String getFormattedName() {\n\nreturn lastName + \", \" + firstName;\n\n}\n\n/**\n\n* Scales the GPA, which is assumed to be on a\n\n* 4.0 scale to a percentage.\n\n*/\n\npublic double getGpaAsPercentage() {\n\nreturn gpa / 4.0;\n\n}\n\n@Override\n\npublic String toString() {\n\nreturn String.format(\"%s, %s (ID = %d); %.2f\",\n\nthis.lastName,\n\nthis.firstName,\n\nthis.id,\n\nthis.gpa);\n\n}\n\n@Override\n\npublic int hashCode() {\n\nfinal int prime = 31;\n\nint result = 1;\n\nresult = prime * result + ((firstName == null) ? 0 : firstName.hashCode());\n\nlong temp;\n\ntemp = Double.doubleToLongBits(gpa);\n\nresult = prime * result + (int) (temp ^ (temp >>> 32));\n\nresult = prime * result + id;\n\nresult = prime * result + ((lastName == null) ? 0 : lastName.hashCode());\n\nreturn result;\n\n}\n\n@Override\n\npublic boolean equals(Object obj) {\n\nif (this == obj) {\n\nreturn true;\n\n}\n\nif (obj == null) {\n\nreturn false;\n\n}\n\nif (!(obj instanceof Student)) {\n\nreturn false;\n\n}\n\nStudent other = (Student) obj;\n\nif (firstName == null) {\n\nif (other.firstName != null) {\n\nreturn false;\n\n}\n\n} else if (!firstName.equals(other.firstName)) {\n\nreturn false;\n\n}\n\nif (Double.doubleToLongBits(gpa) != Double.doubleToLongBits(other.gpa)) {\n\nreturn false;\n\n}\n\nif (id != other.id) {\n\nreturn false;\n\n}\n\nif (lastName == null) {\n\nif (other.lastName != null) {\n\nreturn false;\n\n}\n\n} else if (!lastName.equals(other.lastName)) {\n\nreturn false;\n\n}\n\nreturn true;\n\n}\n\n}\n\nCode Sample 34.1.: The completed Java Student class."

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