Eclipse运行旧版本的Java程序

Question

I have Eclipse 4.5.2.

Suppose I write a program VERSION1.

Then, I change some things (the amount of changes seems to be of no importance) and get VERSION2.

If I now run the program using the "Run" button, it (almost?) always starts VERSION1. When I click the "Run" button again without changing anything, it runs VERSION2. I don't see any new compilation going on between the runs and I cannot imagine why or even how this is possible.

Does anybody know this behavior? Or has at least a clue what is going on?

Edit: In my example I would change the same source file that contains VERSION1 to get VERSION2. I may, for example, fix a bug and run the code again, but it runs the old version with the bug. Only when I run it a second time (without changing anything in the meantime) it runs the version without the bug.

Edit3: It only happens sporadically. Most of the time Eclipse starts VERSION2 as expected, but sometimes, an older version of the code (that is, VERSION1) is started as if VERSION2 was never compiled.

Answer 1

First solution :

In eclipse,click the little arrow next to the run button :

And then you choose your version 2 .It will then be prioritized.

This is a little turnaround but who works well.

2nd solution:

Click the same little arrow then:

• Run configurations ...
• Right Click on version 1
• Delete

Answer 2

Save your files and clean your project first. Then run it. Eclipse usually does some stupid stuff;