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JavaIntroduction & Core Concepts

40 items

1

Printing a Line

Code Quiz
2

Running a Compiled Class

Code Quiz
3

String Concatenation Order

Code Quiz
4

Missing Narrowing Cast

Code Quiz
5

Comparison vs Assignment

Code Quiz
6

Integer Division Surprise

Code Quiz
7

Scanner Import Missing

Code Quiz
8

Reassigning a final Variable

Code Quiz
9

Compound Assignment Typo

Code Quiz
10

Invalid Identifier

Code Quiz
11

Comment Syntax

Code Quiz
12

Using an Uninitialized Variable

Code Quiz
13

Char Literal Quotes

Code Quiz
14

Main Method Signature

Code Quiz
15

The Origins of Java

Quiz
16

print vs println

Quiz
17

Compiling and Running Java

Quiz
18

The main Method Signature

Quiz
19

Java Bytecode & Compilation

Quiz
20

Case Sensitivity in Java

Quiz
21

Types of Java Comments

Quiz
22

Java Naming Conventions

Quiz
23

Write Once, Run Anywhere

Quiz
24

JDK vs JRE vs JVM

Quiz
25

Key Features of Java

Quiz
26

Java Editions Overview

Quiz
27

Compiling and Running Java

Flashcard
28

JDK vs JRE vs JVM

Flashcard
29

The main Method Signature

Flashcard
30

What Is Java?

Flashcard
31

Key Features of Java

Flashcard
32

Write Once, Run Anywhere

Flashcard
33

Java Comments

Flashcard
34

Garbage Collection

Flashcard
35

Printing Output

Flashcard
36

Basic Program Structure

Flashcard
37

Statically-Typed Language

Flashcard
38

Java Bytecode

Flashcard
39

The Java Virtual Machine

Flashcard
40

Case Sensitivity and Naming

Flashcard
Code QuizBeginner

Integer Division Surprise

Find why this average comes out wrong.

Codejava
public class Avg {
    public static void main(String[] args) {
        double average = 7 / 2;
        System.out.println(average);
    }
}

What is the bug that makes 'average' print 3.0 instead of 3.5?