问题:

I want to work on my different class lets say for example house.java but the green play button seems to be locked a program called project.java and only that program. how do I tell Eclipse to run a different classes in the same folder besides the project.java?

回答1:

select your class, then select the small triangle right to the green button, in the dropdown select "Run As" -> "Java Application"

回答2:

Apart from ways mentioned in the other answers, you can also try this short key.

Short key : Press ALT + SHIFT + X then J

Hope this helps. :)

回答3:

You can directly left click on your corresponding class code which you want to run and go to run as-->java application.hope this will help. :)

回答4:

First thing to note that class you want to run should have main method in it. right click on that class and run as --> java application. it will run :)