To use New Interface Wizard you should be in
Resource or Java Perspective.

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Select container in which you want the new interface to be
created.
Open wizards dialog (there are many ways to accomplish
this step in Eclipse)
Unfold Jasclipse category and choose Jasmin
interface.
Click Next >.

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You will see a New Jasmin interface dialog box.
Fields Source folder and Package will
already be filled for you. If you want to choose different place
for your interface, you can either manually change them or use
Browse button. If no package is given, Eclipse will use
default package.
Get your interface a name by filling Name: field.
Name must be unique within a package and should start with a
capital letter.
You can define accessors of the interface by checking or
unchecking accessor fields such as public, final etc.
You can specify interfaces this interface extends by
adding them to Interfaces list.
Click Finish.

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The class SampleInterface is created in com.exaple
package.
Interface file is open in the editor.

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