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JavaIntroduction & Core Concepts

40 items

1

Running a Compiled Class

Code Quiz
2

String Concatenation Order

Code Quiz
3

Missing Narrowing Cast

Code Quiz
4

Comparison vs Assignment

Code Quiz
5

Integer Division Surprise

Code Quiz
6

Reassigning a final Variable

Code Quiz
7

Char Literal Quotes

Code Quiz
8

Main Method Signature

Code Quiz
9

Scanner Import Missing

Code Quiz
10

Compound Assignment Typo

Code Quiz
11

Using an Uninitialized Variable

Code Quiz
12

Invalid Identifier

Code Quiz
13

Comment Syntax

Code Quiz
14

Printing a Line

Code Quiz
15

Case Sensitivity in Java

Quiz
16

Write Once, Run Anywhere

Quiz
17

Java Naming Conventions

Quiz
18

Types of Java Comments

Quiz
19

JDK vs JRE vs JVM

Quiz
20

Key Features of Java

Quiz
21

Java Editions Overview

Quiz
22

The Origins of Java

Quiz
23

print vs println

Quiz
24

Compiling and Running Java

Quiz
25

The main Method Signature

Quiz
26

Java Bytecode & Compilation

Quiz
27

Java Bytecode

Flashcard
28

The Java Virtual Machine

Flashcard
29

Case Sensitivity and Naming

Flashcard
30

Compiling and Running Java

Flashcard
31

JDK vs JRE vs JVM

Flashcard
32

The main Method Signature

Flashcard
33

Java Comments

Flashcard
34

What Is Java?

Flashcard
35

Key Features of Java

Flashcard
36

Write Once, Run Anywhere

Flashcard
37

Statically-Typed Language

Flashcard
38

Basic Program Structure

Flashcard
39

Printing Output

Flashcard
40

Garbage Collection

Flashcard
Code QuizBeginner

Using an Uninitialized Variable

Find why this local variable causes a compile error.

Codejava
public class Init {
    public static void main(String[] args) {
        int count;
        System.out.println(count);
    }
}

What is the bug in this code?