How to change package name in android eclipse

I have an Android project created in eclipse.I want to modify the package name and application of the project.How to do that in eclipse?

Step 1  :-  Open eclipse  IDE and

Right click the project and select Android Tools >> Rename Application Package. as shown below image

Step 2 :- Enter the new Package name 

Step 3 :-And click ok appear new windows in front of you as shown below

Click finsh button . Accept all the automatic changes it wants to makeSay yes to update the launch configuration...