Java Code not properly updating

Have you tried cleaning the project?

Project(menu) -> clean

Also make sure

Project(menu) -> Build Automatically

is selected so that all new code you write is compiled then and there

If the clean and build doesn't work, it's possible that there is a jar file contains the class you edited, so the eclipse will run the compiled class file in the jar instead of your current file.

There are two possibilities because of which the java code is not updating properly:

1. Project -> Build Automatically is not checked

2. In .project file of Project org.eclipse.jdt.core.javabuilder build command is commented or missing. Here the below mentioned piece of code should not be commented:

   <buildCommand>
        <name>org.eclipse.jdt.core.javabuilder</name>
        <arguments></arguments>
   </buildCommand>