We just focusing about Source File Structure which is the kind of import and package issues .The following legal code declares a class Foo, in package com.geeksanonymous : 

package com.geeksanonymous; // Notice the semicolon
class Foo { }

Here in this code its singing a only one package statement per source cod file , that\'s are following as : 

package com.geeksanonymous;
package com.wickedlysmart; // Illegal! Only one package declaration allowed
class Foo { }

If class Foo adds any import statement then the code is :
 package com.geeksanonymous;
import java.util.*; // Wildcard package import
import com.wickedlysmart.Foo; // Explicit class import
class Foo { }
 
If the Class Foo dont have a package then the import statements must be above the:

class declarationof the above code .as folows :
import java.util.*; // Wildcard package import
import com.wickedlysmart.Foo; // Explicit class import
class Foo { }