Java · JDK 8-21 · From $20
Do My Java Homework
In Java the autograder is itself a Java program. Gradescope runs your code through Jacquard, JUnit 5, Checkstyle, PMD, and JaCoCo at once, so the grade rides on style and coverage as much as on correct output. A working JVM developer writes the code, then pre-runs it against that exact stack before you submit.
Compiled to your JDK · Autograder-checked · Pay 50% after it runs
What we cover in Java
The whole JVM toolchain, not just the language
Java coursework grades the build, the tests, and the style report, so the work has to clear the whole stack. We write against the same tools your course keys on: the JDK you declare, JUnit 5 for the tests, Maven or Gradle for the build, and the Checkstyle, PMD, and JaCoCo graders that quietly decide a third of the marks.
Collections and Generics get parameterized properly, not left raw. Public methods carry Javadoc. Comparable and Comparator are implemented where the sort contract demands them. And concurrency work uses ExecutorService and the java.util.concurrent types instead of bare Thread objects that race under a stress test.
Java assignments we do
Four assignment shapes, start to graded
A generic data structure with full JUnit coverage
A generic LinkedList<T>, Deque<T>, or resizing-array Stack<T> that implements Iterable<T>, shipped with your own JUnit 5 suite that clears the JaCoCo branch-coverage floor. This is the CS61B lab and the COS226 Deque / RandomizedQueue shape, graded on the iterator contract and edge cases, not just a passing main method.
An inheritance and polymorphism class hierarchy
The canonical BankAccount to SavingsAccount / CheckingAccount tree (or Shape to Circle / Rectangle): an abstract base, overridden methods, and Comparable / Comparator sorting. Points hinge on late binding, encapsulation, and a correct equals / hashCode pair, which is where most submissions quietly lose marks.
A Swing or JavaFX desktop application
An interactive GUI built with Button, Label, and ImageView controls, event handlers wired to a controller, and MVC separation so the view and the model stay apart. Calculator, to-do, and form-driven apps are the usual brief in CS1 and CS2.
A capstone systems or web project
Multi-class engineering work: Gitlet, the version-control clone from CS61B, an A* MapGraph router, or a Spring Boot REST API with @RestController endpoints and JPA / JDBC persistence. These carry a milestone GitHub commit history, so the repo is built up in staggered, human-looking commits, not one dump at the end.
Java problems we fix
Six Java errors that cost real marks
Each one has a known cause and a known fix. We name the mechanism, not just the stack trace, so the same exception stops coming back on the next assignment.
NullPointerException on a value that should exist
Dereferencing an uninitialized object, usually a null map value or an unassigned field. We initialize at declaration, guard with Objects.requireNonNull or Optional, and null-check before the dot so the trace stops appearing.
ConcurrentModificationException inside a loop
Mutating a collection during a for-each pass throws it every time. We switch to Iterator.remove(), iterate over a copy, or use removeIf() so the deletion is safe mid-iteration.
Objects vanish from a HashMap or HashSet
Overriding equals but not hashCode breaks the contract, so equal objects hash to different buckets and disappear. We override both together over the same fields with Objects.equals and Objects.hash.
Raw types and a ClassCastException at runtime
Using List without the diamond bypasses type safety and blows up later instead of at compile time. We parameterize every collection and use bounded wildcards (<? extends T>) on read APIs.
ArrayIndexOutOfBoundsException and the off-by-one
Looping i <= length, or mishandling the 2D-array boundary on the AP CSA free-response question. We loop i < arr.length, prefer the enhanced for-each, and validate bounds before indexing.
Checkstyle and PMD style points dropping silently
Wildcard imports, missing Javadoc, and lines over the 100-char limit dock the autograder score even when every test passes. We ship clean against the course ruleset so the style gate adds nothing to the deduction column.
Larger graded projects
Do My Java Assignment
An assignment here means the big, multi-class project, not the weekly problem set. Gitlet, an A* MapGraph router, a JavaFX app, or a Spring Boot REST API land as one working build with a milestone GitHub commit history behind it. The repo grows in staggered commits across the project window, the way a grader expects to see a milestone project come together, not as a single end-of-night push.
The package structure follows the convention courses enforce: src/main/java for the code, src/test/java for the suite. The build runs clean on mvn test or ./gradlew test, and the Javadoc generates without warnings.
Walkthrough on the spec
Java Assignment Help (Projects and Specs)
Some students want the project built and explained, not just handed over. Every delivery comes with a short write-up of the approach, the data structures chosen, and why each class is shaped the way it is. Two or three viva-defense questions ship with it, the kind a TA asks when they suspect you cannot account for your own design.
Get Help With a Java Assignment
Stuck on one piece of a bigger project rather than the whole thing? Send the part that is failing: a NullPointerException you cannot trace, a single autograder test that stays red, a generic method that will not compile. We fix that slice, explain the cause, and leave the rest of your code as yours.
Weekly problem sets
Java Homework Help (Weekly Problem Sets)
Homework is the recurring small stuff: a CS61B lab, a Rutgers introcs exercise, an AP CSA free-response practice set with its String and ArrayList surface. These need a JUnit-passing solution and a fast turnaround, not a milestone repo. Send the brief, get a fixed quote, get back code that passes the suite and reads cleanly.
Get Help With Java Homework
Prefer to learn it rather than hand it off? We pair on the fix instead of just dropping the answer: we walk through why the loop went out of bounds, why the HashSet lost your object, or why the inheritance chain called the wrong overridden method, so you can write the next one yourself.
// before: 17/30 on Gradescope, every JUnit test red after the deadline scare
// cause: equals() overridden, hashCode() left default, objects lost in a HashMap
//
// after: Objects.equals + Objects.hash over the same fields, suite green,
// Checkstyle clean, JaCoCo at 88% branch coverage, 29/30
//
// "I could walk the TA through the equals/hashCode contract in the viva."
// - data structures student, JDK 17, 2026How it works
From brief to green suite
Send the brief and your JDK target
Upload the spec, the rubric, your JDK line (8, 11, 17, or 21), and whether it is Maven or Gradle. Name the autograder if you know it: Gradescope, CodeGrade, a Berkeley jh61b format.
Get a fixed quote in 15 minutes
A JVM developer reads the spec and sends one price. No hourly meter, no surprise fees.
Pay half, code written and tested
You pay 50% upfront. The code is written, the JUnit suite is run, and the Checkstyle and PMD checks are cleared before anything reaches you.
Pay the rest after it runs
Run mvn test or ./gradlew test on your machine. Pay the other 50% only once the suite is green. Revisions stay free for 7 days.
Want the full process first? Read how it works.
Pricing
One fixed price per Java assignment, from $20
A single-file exercise sits at the Standard tier. A multi-class OOP hierarchy moves up. A Spring Boot or Gitlet capstone lands at Advanced. You see the full number before you pay, you pay half to start, and there are no rush fees.
Java homework help
Questions, answered
The Java-specific questions students ask before they send a brief: JDK versions, autograders, JUnit, Checkstyle, and the build tools.
Will your code pass the Gradescope autograder? +
Yes. The submission is pre-run against the Jacquard and JUnit 5 format your course uses, with Checkstyle and PMD style checks included, so the style points land alongside the test points before you ever upload it.
Can you match my JDK version (8, 11, 17, or 21)? +
Yes. The JDK target is declared in your pom.xml or build.gradle and the code is compiled against that exact line, so nothing breaks because the grader runs an older or newer JVM than your laptop.
My JUnit tests fail but the logic looks right. Can you fix it? +
Yes. We run the suite, trace the failing assertions, and correct the contract behind them, often a broken equals / hashCode pair or an unhandled edge case, then re-run until the suite is green.
Can you write the JUnit tests too, to hit the JaCoCo coverage gate? +
Yes. We write a JUnit 5 suite with @Test and @ParameterizedTest cases that clears the branch-coverage floor your course sets, commonly between 70% and 90%.
Do you handle Checkstyle and PMD style violations? +
Yes. The code ships clean against your course ruleset: the 100-char line limit, Javadoc on every public method, and no wildcard imports, so the static-analysis grader stops costing you points.
Can you build a Swing or JavaFX GUI assignment? +
Yes. Event handlers, a controller class with MVC separation, and the required UI controls (Button, Label, ImageView) are all in scope, wired the way an intro course expects them.
Can you do a Spring Boot or JDBC project with a database layer? +
Yes. @RestController endpoints, JPA / Hibernate or raw JDBC persistence, and a milestone GitHub commit history come together as one working project, not a pile of disconnected files.
Is it Maven or Gradle, and does that matter? +
Either works. The build is delivered with a working pom.xml or build.gradle that matches your project layout, so mvn test or ./gradlew test runs straight away.
Related pages
Pages students pair with Java
JavaScript for the front end of a Java backend, C++ for the other big data-structures language, SQL for the database half of a JDBC project, and the data-structures hub where Java is the canonical course language.
Send your Java brief now
Name your JDK and your deadline. The first reply is free, and you pay nothing until you approve the price.