Q:

Can we run decompiled java (jar to java)

I have decompiled a jar file.  Can we run this file using eclipse or some other IDE.  Or any way to do this.  Thanks in Advance. 

A:

It depends on a number of things, such as:

whether the original JAR was runnable,
whether the decompiler produced compilable Java code,
whether the decompiler produced correct Java code, and
whether you have all of the dependencies for the decompiled code. 

Note that decompilers tend to have difficulty with code that has been obfuscated, and code that uses the latest Java language features.