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Browse 225 Java questions organized into 5 categories.

Most Java questions are also available in Kotlin. (Support for Python is in alpha.)

Printing

A Generous Curve

Array Basics

Array Count Odd Snippet

Array Snippet Sum

Array Sum Even Snippet

Center of the Universe

Easy Peasy Loop

FizzBuzz

FozzBuzz

Go Beyond Grading

Hello, Fall 2021!

Hello, learncs.online!

Hello, world!

Is CS Amazing

Largest of Three

Math Minus

Number Loop

Odd Range Sum

Print Adult Or Not

Print Larger, Sometimes

Print Number Summary

Quiz Score Advice

Reverse Print

Reverse Print Same Line

Simple Conditional

Time to Decade

Victory Loop

Variables

2D Array Max Subarray Sum

Add One Function

Adder with Lambda

All or Nothing

Area Calculation

Array All Pairs

Array Count Equal (One Dimensional)

Array Count Equal (Two Dimensional)

Array Count Greater Than (Two Dimensional)

Array Count Greater Than 1D

Array Count Not Equal (Two Dimensional)

Array Deep Copy

Array Fill 3 Pattern

Array Is All Larger

Array Is Doubled

Array Is Sorted

Array Max (1D)

Array Range Sum

Array Same Size (Two Dimensional)

Array Squares Sorted

Array Sum (One Dimensional)

Array Sum (Two Dimensional)

Array Sum Even (One Dimensional)

Binary Tree Any Same Shape

Binary Tree Count Children Sum to Even

Binary Tree Count Children Sum to Negative

Binary Tree Count Equal to Child

Binary Tree Count Leaves

Binary Tree Count Non-Leaves

Binary Tree Search Path

Binary Tree Size

BinarySearcher Array

BinarySearcher Array (int)

BinaryTree Balanced

BinaryTree Count Equal Children

BinaryTree Count Greater Than

BinaryTree Count Not Equal

BinaryTree Even Sum

BinaryTree Odd Sum

BinaryTree Same Shape

BinaryTree Values at Level

BinaryTree Values at Level (int)

BinaryTree to List

BinaryTree to Map

Both Greater Comparable

Car Comparable

Car Equality

Catchup Quiz Grading

Circle Shape

Cities Are Connected

Comparable BiggerSmaller Counter

Comparable Cat

Comparable Count Greater

Comparable Dog

Comparable Fish

Comparable Max

Comparable Min

Comparable MinMax

Compare Date Strings

Count DNA Subsequence

Count Letters with Map

Counter Object

Course CSV to Courses

Course Equality

Course Getters and Setters

Course Hash Code

Dog Getters and Setters

Dog Is Older

Email to NetID

Escape a Maze

Even Counter

Fall 2021 Grade Calculation

Flip Flop Object

Flop Flip Object

Football CSV

Game CSV Max First

Game CSV Sum

Game CSV Sum with Map

Game Tiebreaker Function

Game Tiebreaker Snippet

Guessing Game With Tries

Insertion Sort

Insertion Sort (int)

Inspiration v. Perspiration

Invert a Map

Is Even

Is Odd

Isomorphic Strings With Map

Isomorphic Strings Without Map

Kotlin Simple Object Field

Kotlin Simple Object Field 2

Last 4 In Order

Last 8

Last In List

Last Odd Interface

Last Value From String

List Unique Items

Map Has Duplicate Values

Map Sum Longer Than

Mario Bricks

Max Double

Mergesort

Min Int

Multiplier Single Method

Mystery Class 1

Mystery Method 1

Mystery Method 2

Object Array Shallow Copy

Object v. Reference Equality

OurComparable Car

OurComparable Dog

OurComparable Is Sorted

OurComparable Max

Overloaded Add

Overloaded Area

Overloaded Multiply

Pentagon Shape

Person Encourager

PingPonger Class

Points Class

Polymorphic Greeter

Polymorphic Orderer

Practice with Primitive Types

Practice with Primitive Types 2

Practice with Primitive Types 4

Practice with Variable Declaration and Initialization 0

Quicksort Partition (First Value)

Rectangle Shape

Recursive Factorial

Recursive Range Sum

Reformat Name and Age Records

Reformat a Name

Reformat a Phone Number

Restaurant Capacity Manager

Restaurant Equality

Restaurant Getters and Setters

Restaurant Hash Code

Return an Exception

Right Triangle Shape

Rot 13 Encryption

Running Total Interface

Same Count

Same or Different

Score Tracker

Script Parser

Section Lists to Map

Selection Sort

Simple Cat Inheritance

Simple Dog Inheritance

Simple Object Field

Simple Object Field 2

Simple Object Method

Simple Object Method (Kotlin)

Simple Object Method 2

Simple Object Method 2 (Kotlin)

Simple Person Inheritance

SimpleArrayList add

SimpleArrayList equals

SimpleArrayList get and set

SimpleLinkedList Count Equal

SimpleLinkedList Count Not Equal

SimpleLinkedList add

SimpleLinkedList count

SimpleLinkedList find

SimpleLinkedList set

Small Word Filter With List

Song Equality

Square Shape

Static Adder

String Both Ways Anonymous Class

String Character Sum

String Doubled

String Duplicate Words Ignore Case

String Equality

String Flip Halves

String Last Name

String Length Comparable

String Reverse

String Rotate Left

String Rotate Right

Subtracter Single Method

Subtracter with Lambda

Sum Is Odd

Temperature Getters and Setters

Test Array Max

Test Array Sum

Test Rotate String

Tic-Tac-Toe

Toggler Object

Unique Counter

Unweighted Graph Is Undirected

Word Lengths With Map

Conditionals

Person Whisperer

Pet Whisperer

Loops

Multi Catcher

Functions

Bracket an Anonymous Class

Catching Exceptions

Format Date