Java Jeopardy (Units 0-2)

Objects & Methods

100

This is another name for a data field in a class.

What is an instance variable?

200

This method is automatically called when you create an object.

What is the constructor?

300

This type of method can be called without creating an instance of an object.

What is a static method?

400

This method is automatically called when you System.out.println an object.

What is the toString method?

500

This word describes the phenomenon of having two methods with the same name in the same class that have a different number of parameters.

What is overloading or polymorphism?

Interfaces & Inheritance

100

This keyword is used to inherit all attributes and methods from a parent class.

What is extends?

200

This is the term for a class that can have both defined and undefined methods.

What is an abstract class?

300

A class that implements one of these must define EVERY method it inherits. 

What is an interface?

400

This keyword calls a parent method or constructor from your subclass.

What is super?

500

This keyword indicates a method or data field is accessible only to methods in the class.

What is private?

String Manipulation

100

This symbol is used to concatenate two strings together.

What is +?

200

This String method tells you how many characters a string contains.

What is length()?

300

The String method is used to determine where in the string a character or substring may be found.

What is indexOf?

400

The word produced by the expression str.substring(1, 4) if str is "what's up?"

What is "hat"?

500

All objects implement or inherit this method, which lets them be represented as Strings.

What is toString()?

Find the Error

100

Scanner s = new Scanner;

Scanner s = new Scanner(System.in);

200

double = area;

double area;

300

if (x = 5) { ...}

if (x == 5) { ... }

400

String name = "Dracula";

if (name == "Beyonce") { ... }

if (name.equals("Beyonce")) { ... }

500

2 * length + 2 * width = perimeter;

perimeter = 2 * length + 2 * width;

Wild Card

100

The output of the following code:

int x = 5;

int y = 2;

System.out.println(x/y);

What is 2?

200

This type of programming language is human-friendly and often includes English words like if, while, etc.

What is a high-level language?

300

For this type of programming language, the entire program is translated to machine code at once and then executed.

What is a compiled language?

400

In Java, an int data type is this many bits.

What is 32 bits?

500

This is the name for the phenomenon when you subtract one from the minimum value for an integer and the value "rolls over" to the maximum value for an integer.

What is an integer underflow?