Java Decompiler
Decompiler.com
CFR
Bytecode Viewer
Java Class File Editor
Cavaj Java Decompiler
ShenmeApp Java Decompiler
.NET Reflector
CodingInterview
AlgoExpert.io
Interview Cake
interviewing.io
Daily Coding Problem
Codechef
CodeForces
LogicMojo
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Decompiler.com - Online Java and Android decompiler. Just drag and drop .JAR or .APK file and browse decompiled content online.
AlgoExpert.io - A better way to prep for tech interviews
CFR - CFR is a JVM bytecode decompiler - it will decompile modern Java features - up to and including much of Java 9, but is written entirely in Java 6, so will work anywhere! - It'll even make a decent go of turning class files from other JVM languages (โฆ
Interview Cake - Free practice programming interview questions. Interview Cake helps you prep for interviews to land offers at companies like Google and Facebook.
Bytecode Viewer - A Java 8 Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
interviewing.io - Free, anonymous technical interview practice