Eclipse showing errors for no reason

[ilovejava]

Hi when I use ecclipse to run codes it shows many errors, and they are not errors at all I compiled them with command prompt and it work.

this is the image

http://i.imgur.com/az6Pg.jpg

My java and javac version is 7 u 2

[stultuske]

what error messages do you get?

[ilovejava]

ex -
The import java.util cannot be resolved

Override cannot be resolved to a type

Implicit super constructor Object() is undefined. Must explicitly invoke another constructor

[Jaggs]

eclipse is not linked to the java libraries or they are not installed

To setup Eclipse to use the JDK you must follow these steps.

1.Download the JDK

First you have to download the JDK from Suns site. (Make sure you download one of them that has the JDK)

2.Install JDK

Install it and it will save some files to your hard drive. On a Windows machine this could be in c:\program files\java\jdk(version number)

3.Eclipse Preferences

Go to the Eclipse Preferences -> Java -> Installed JREs

4.Add the JDK

Click Add JRE and you only need to located the Home Directory. Click Browse... and go to where the JDK is installed on your system. The other fields will be populated for you after you locate the home directory.

5.You're done

Click Okay. If you want that JDK to be the default then put a Check Mark next to it in the Installed JRE's list.

[ilovejava]

I have the JDK installed but how do find the eclipse prefrences?

[ejosiah]

go to the eclipse menu options Window -> Preferences or you can right click on your project and select Build Path -> Add Libraries... from the context menue and select JRE System Library from the Add Library dialog box

[designuts]

Sometimes when I am using Eclipse on different computers, I will have different JRE's installed. For example, I use JRE7 on one and the other has JRE6 installed. When I go from one to the other, Eclipse throws a ton of errors. So make sure whatever JRE you used to originally make the program is the same version as the one you're using now.