JAVA

java decompiler

Tools for mac:
1- http://www.javadecompilers.com/
2- http://java-decompiler.github.io/

In terminal:
add permitions
chmod u+x d2j_invoke.sh
chmod u+x d2j-dex2jar.sh

Create java class in terminal
sh d2j-dex2jar.sh classes.dex

java decompiler

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A simple way to see what String literals are used in a ".class" file is to use the javap utility in your JDK installation to dump the file using the "-v" option. Then grep for text that looks like <String "..."> where ... is the String you are looking for.