Eclipse doesn't find javax.swing

Question

Eclipse cant find the import javax.swing.JOptionPane

Where is it located and how can i include it?

import javax.swing.JOptionPane;


        

Answer 1

Try to Update the execution environment under system library to JavaSE-1.7 or JavaSE-1.8 in eclipse. To update the step below can be followed:

> Right-click on the project
> Select properties
> Java build path
> Library > Add Library > Add JRE SYSTEM Library
> Execution Environment
> Select JavaSE-1.7 or JavaSE-1.8
> Finish

Answer 2

1. There must be an installed (and selected) JDK in Eclipse:

   Window > Preferences > Java > Installed JREs   
   

2. The project must be configured to use that JDK:

   Project > Properties > Java Build Path > Libraries
   

   there should be an entry like "JRE System Library [JDK7]" in the list. If not press:

   Add Library... > JRE System Library
   

3. The project should have been created as a "Java Project":

   Project > Properties > Builders
   

   should include "Java Builder"

Answer 3

The accepted answer did not work for me.

This is how I solved it:

Right-Click on your project, select Properties

Go to Java Build Path

Click Libraries, then Add Library ...

Select JRE System Library

Click on Execution environment and select JavaSE-1.7 or JavaSE-1.8

Click Finish, then Apply and Close.