Java JEOPARDY

Java Beans

100

This method is required in all Java programs: public static void ______ (String[] args) { ... }

What is main?

200

The output of: 

if (5 * 7 < 4 * 9) return true; else return false;

What is true?

300

this prints out something to the console

What is System.out.println (or System.out.print)?

400

the length of the string of “computer science is cool”

What is 24?

500

The names of 3 primitive data types for numbers in Java

What is short/int/long/float/double?

Methods!

100

In Java, this method is used to generate a random number

What is Math.random?

200

In Java, this method checks the length of a string data type

What is .length()?

300

In Java, this method lets you check if a character is a digit

What is Character.isDigit()?

400

If you name your Scanner scanner, this piece of code will read a double entered by a user

What is "scanner.nextDouble()?

500

In Java, this method lets you convert a lowercase letter to uppercase

What is Character.toUpperCase()?

Java Talk

100

'c' is an example of this primitive data type

What is char?

200

This single symbol is known as the statement terminator

What is a "semicolon"?

300

The Java syntax for creating a single line comment

What is "two forward slashes"? (//)

400

What is b in the following code? int[] b = new int[10];

What is an integer array of size 10?

500

This is the process of converting a variable from one data type to another

What is "casting"/"type-casting"?

Java Control Flow

100

This Java keyword is used to define a decision-making structure, where different code blocks are executed based on a specific condition

What is "if/switch"?

200

This Java keyword is used to skip the rest of the code inside of a loop and immediately proceed with the next iteration

What is "continue"?

300

This Java keyword is used to immediately terminate the execution of a loop, executing the next section of code after the loop

What is "break"?

400

This Java loop will always execute at least one time, and then continue executing as long as the condition is met

What is a "do-while" loop?

500

This Java loop iterates through each element of an array, collection, or other iterable object

What is a "for-each" loop?

Arrays

100

This is the index of the very first item in an array

What is 0?

200

The index of 27 in the array:

[13, 4, 29, 28, 27, 42, 5]

What is 4?

300

The output of the following code when i = 3:

numbers[] = {10, 20, 30, 40, 50, 60}

for(i:numbers) System.out.println(numbers[i]);

What is "40"?

400

The value of the variable 'avg' in: 

numbers[] = {1, 2, 3, 4, 5};

for (i:numbers) sum += i; avg = sum/i;

What is "3"?

500

The default value of an uninitialized element in an integer array 

What is "0"?