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AlgoExpert.io
Interview Cake
interviewing.io
Daily Coding Problem
Codechef
CodeForces
LogicMojo
Decompiler.com
Java Decompiler
CFR
Bytecode Viewer
Java Class File Editor
Cavaj Java Decompiler
ShenmeApp Java Decompiler
luyten
CodingInterview
Decompiler.comAlgoExpert.io - A better way to prep for tech interviews
Java Decompiler - Yet another fast Java decompiler
Interview Cake - Free practice programming interview questions. Interview Cake helps you prep for interviews to land offers at companies like Google and Facebook.
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
interviewing.io - Free, anonymous technical interview practice
Bytecode Viewer - A Java 8 Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)