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Questions and Answers
Write the constructor for Student class with three arguments (id, gpa, name).
Write the constructor for Student class with three arguments (id, gpa, name).
public Student(int id, double gpa, String name) { this.id = id; this.gpa = gpa; this.name = name; }
Write the constructor for Student class with no arguments.
Write the constructor for Student class with no arguments.
public Student() { this.id = 1000; this.gpa = 0.0; this.name = "No name yet"; }
Write the toString() method for the Student class.
Write the toString() method for the Student class.
@Override public String toString() { return "id=" + id + ", gpa=" + gpa + ", name='" + name + '"'; }
Write code to calculate the product of two strings representing large integers.
Write code to calculate the product of two strings representing large integers.
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Write an expression that returns true if a character is an arithmetic operator.
Write an expression that returns true if a character is an arithmetic operator.
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What attribute should be added to the Account class to track the number of accounts?
What attribute should be added to the Account class to track the number of accounts?
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Write a function to change the status of students to the next level.
Write a function to change the status of students to the next level.
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Write the equals method for Student class.
Write the equals method for Student class.
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Write a statement to throw an exception with a message.
Write a statement to throw an exception with a message.
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Declare a String type instance variable named id for the Employee class.
Declare a String type instance variable named id for the Employee class.
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Write a method to check if a string is an email address.
Write a method to check if a string is an email address.
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Write a method that returns the first character of each string in an ArrayList.
Write a method that returns the first character of each string in an ArrayList.
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Define a class Telephone with a static method getFullNumber.
Define a class Telephone with a static method getFullNumber.
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Study Notes
Student Class Constructors
- Constructor with parameters initializes
id,gpa, andnameattributes. - Default constructor initializes
idto 1000,gpato 0.0, andnameto "No name yet".
Student Class Methods
-
toString()method returns a string representation of a student's details includingid,gpa, andname.
String Multiplication
- Code example multiplies two large number strings (
s1ands2) and assigns the result tos3as a string.
Arithmetic Operator Check
- Method checks if a character
cis among the arithmetic operators:+,-,*,/,%, returning true if found.
Account Class
- Introduces a static attribute
numberOfAccountsto count instances ofAccountcreated. - Constructor updates the account count upon instantiation.
Student Status Update
- Method iterates through an array of
Studentobjects and updates their status from each level (FR → SO, SO → JR, JR → SR, SR → DONE).
Equals Method for Student
- Method compares two
Studentobjects based on theiridto determine equality.
Exception Handling
- Code demonstrates throwing a custom exception with the message "Not enough sugar".
Employee Class
- Contains a public instance variable
Idthat is accessible by subclasses. - Method
details()prints the employee ID to the console.
Email Address Validation
- Method checks if a string contains exactly one
@sign, with no spaces, tabs, or newline characters.
String Construction from ArrayList
- Method creates a string composed of the first characters of each string in an
ArrayList.
Telephone Class Definition
- Class includes a static method
getFullNumberthat prepends "785-" to a given phone number string without a constructor.
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Description
Test your knowledge on Java constructs with this quiz focused on the Student class. Questions cover key aspects like constructors with arguments and no arguments. Ideal for students preparing for Java exams.
