performance - Does an unused import declaration eat memory, in Java? -
does unused import - import android.widget.relativelayout; eat memory? want know how or valuable? maybe stupid question, haven't found answer. no don't take memory. imports used compiler resolve class names @ compile time. compiler changes each class name qualified name. , removes import statement. so, import statement doesn't make byte code. the issue can come wildcard import namespace conflict, i.e., when 2 types same name defined in 2 different packages, importing packages wildcards cause name conflict type used. to see how compiler replaces import statement, can generate byte code of class using javap command. consider below code: import java.util.*; import java.util.regex.*; public class test { public static void main(string[] args) { } } just compile above code, , check byte code using following command: javap test it gives out following output: public class test { public test(); public static void main(java.lang.string[]
