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Browse 166 Java questions organized into 16 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

Practice with Primitive Types

Practice with Primitive Types 2

Practice with Primitive Types 4

Practice with Variable Declaration and Initialization 0

Conditionals

Center of the Universe

Game Tiebreaker Snippet

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 Sum Even Snippet

Number Loop

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 Multiply

Reverse Print

Sum Is Odd

Tic-Tac-Toe

Strings

2D Array Max Subarray Sum

Array Count Greater Than 1D

Array Is Sorted

Array Max (1D)

Array Same Size (Two Dimensional)

Array Sum (Two Dimensional)

Count DNA Subsequence

Email to NetID

Football CSV

Last Value From String

Mario Bricks

Print Number Summary

Reformat Name and Age Records

Reformat a Phone Number

Rot 13 Encryption

Small Word Filter With Array

String Equality

String Flip Halves

String Reverse

String Rotate Left

String Rotate Right

Classes

Array Deep Copy

Comparable Max

Compare Date Strings

Counter Object

Course Getters and Setters

Course Hash Code

Flip Flop Object

Flop Flip Object

Format Date

Format Date Method

Guessing Game

Kotlin Simple Object Field

Kotlin Simple Object Field 2

Last 4 In Order

Last 8

Last Odd 8

Mystery Class 1

Mystery Method 1

Mystery Method 2

Object Array Shallow Copy

Object v. Reference Equality

Object with Public Value

OurComparable Max

Quicksort Partition (First Value)

Restaurant Getters and Setters

Return an Exception

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

Test Array Sum

Test Rotate String

Toggler Object

Inheritance

Circle Shape

Course CSV to Courses

Course Equality

Polymorphic Greeter

Polymorphic Orderer

Restaurant Equality

Simple Person Inheritance

SimpleLinkedList add

SimpleLinkedList set

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

List to Set

Map Has Duplicate Values

OurComparable Is Sorted

Script Parser

Section Lists to Map

Selection Sort

Small Word Filter With List

String Duplicate Words Ignore Case

Unique Counter

Word Count With Map

Word Lengths With Map

Interfaces

Both Greater Comparable

Last Odd Interface

Running Total Interface

String Length Comparable

String Length Comparable Parameterized

Binary Trees

Binary Tree Count Equal to Child

Binary Tree Search Path

Binary Tree Size

BinaryTree Balanced

BinaryTree Count Equal Children

BinaryTree Negative Sum

BinaryTree Values at Level

BinaryTree Values at Level (int)

BinaryTree to Map

Graphs

Undirected Graph Neighborhood Count

Undirected Graph Size

Unweighted Graph Is Undirected

Functional

Adder with Lambda

Bracket an Anonymous Class

String Both Ways Anonymous Class

Subtracter with Lambda