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Browse 225 Java questions organized into 17 categories.

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

Printing

Go Beyond Grading

Hello, Fall 2021!

Hello, learncs.online!

Hello, world!

Variables

Area Calculation

Fall 2021 Grade Calculation

Inspiration v. Perspiration

Math Minus

Practice with Primitive Types

Practice with Primitive Types 2

Practice with Primitive Types 4

Practice with Variable Declaration and Initialization 0

Conditionals

A Generous Curve

Center of the Universe

Game Tiebreaker Snippet

Is CS Amazing

Largest of Three

Print Adult Or Not

Print Larger, Sometimes

Quiz Score Advice

Simple Conditional

Time to Decade

Arrays

Array Basics

Loops

Array Count Odd Snippet

Array Snippet Sum

Array Sum Even Snippet

Easy Peasy Loop

Number Loop

Odd Range Sum

Reverse Print Same Line

Victory Loop

Functions

Add One Function

Array All Pairs

Array Count Equal (One Dimensional)

Array Fill 3 Pattern

Array Is All Larger

Array Is Doubled

Array Range Sum

Catchup Quiz Grading

Game Tiebreaker Function

Is Even

Is Odd

Overloaded Add

Overloaded Area

Overloaded Multiply

Reverse Print

Sum Is Odd

Tic-Tac-Toe

Strings

2D Array Max Subarray Sum

Array Count Equal (Two Dimensional)

Array Count Greater Than (Two Dimensional)

Array Count Greater Than 1D

Array Count Not Equal (Two Dimensional)

Array Is Sorted

Array Max (1D)

Array Same Size (Two Dimensional)

Array Sum (One Dimensional)

Array Sum (Two Dimensional)

Array Sum Even (One Dimensional)

Count DNA Subsequence

Email to NetID

Football CSV

Game CSV Max First

Game CSV Sum

Last Value From String

Mario Bricks

Print Number Summary

Reformat Name and Age Records

Reformat a Name

Reformat a Phone Number

Rot 13 Encryption

String Character Sum

String Doubled

String Equality

String Flip Halves

String Last Name

String Reverse

String Rotate Left

String Rotate Right

Classes

All or Nothing

Array Deep Copy

Comparable BiggerSmaller Counter

Comparable Count Greater

Comparable Max

Comparable Min

Comparable MinMax

Compare Date Strings

Counter Object

Course Getters and Setters

Course Hash Code

Dog Getters and Setters

Dog Is Older

Even Counter

FizzBuzz

Flip Flop Object

Flop Flip Object

Format Date

FozzBuzz

Kotlin Simple Object Field

Kotlin Simple Object Field 2

Last 4 In Order

Last 8

Max Double

Min Int

Multiplier Single Method

Mystery Class 1

Mystery Method 1

Mystery Method 2

Object Array Shallow Copy

Object v. Reference Equality

OurComparable Max

Person Encourager

Points Class

Quicksort Partition (First Value)

Restaurant Getters and Setters

Return an Exception

Same Count

Same or Different

Score Tracker

Simple Object Field

Simple Object Field 2

Simple Object Method

Simple Object Method (Kotlin)

Simple Object Method 2

Simple Object Method 2 (Kotlin)

SimpleArrayList add

SimpleArrayList get and set

Static Adder

Subtracter Single Method

Temperature Getters and Setters

Test Array Sum

Test Rotate String

Toggler Object

Inheritance

Car Equality

Circle Shape

Course CSV to Courses

Course Equality

Person Whisperer

Pet Whisperer

Polymorphic Greeter

Polymorphic Orderer

Rectangle Shape

Restaurant Equality

Right Triangle Shape

Simple Cat Inheritance

Simple Dog Inheritance

Simple Person Inheritance

SimpleArrayList equals

SimpleLinkedList add

SimpleLinkedList set

Song Equality

Square Shape

Exceptions

Array Squares Sorted

BinarySearcher Array

BinarySearcher Array (int)

Catching Exceptions

Escape a Maze

Guessing Game With Tries

Insertion Sort

Insertion Sort (int)

Isomorphic Strings Without Map

Multi Catcher

Pentagon Shape

PingPonger Class

Restaurant Capacity Manager

Restaurant Hash Code

Test Array Max

Recursion

Mergesort

Recursive Factorial

Recursive Range Sum

Collections

Cities Are Connected

Count Letters with Map

Game CSV Sum with Map

Invert a Map

Isomorphic Strings With Map

Last In List

List Unique Items

Map Has Duplicate Values

Map Sum Longer Than

OurComparable Is Sorted

Script Parser

Section Lists to Map

Selection Sort

Small Word Filter With List

String Duplicate Words Ignore Case

Unique Counter

Word Lengths With Map

Interfaces

Both Greater Comparable

Car Comparable

Comparable Cat

Comparable Dog

Comparable Fish

Last Odd Interface

OurComparable Car

OurComparable Dog

Running Total Interface

String Length Comparable

Linked Lists

SimpleLinkedList Count Equal

SimpleLinkedList Count Not Equal

SimpleLinkedList count

SimpleLinkedList find

Binary Trees

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

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

Graphs

Unweighted Graph Is Undirected

Functional

Adder with Lambda

Bracket an Anonymous Class

String Both Ways Anonymous Class

Subtracter with Lambda