java - Using subtype for parameter in method override -

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public abstract class sequenceitemholder {      public sequenceitemholder(view itemview) {     }      public abstract void setdata(sequencerowelement.rowelement rowelement);           public static class testeitemholder extends sequenceitemholder {          public testeitemholder(view itemview) {         }          @override         public void setdata(sequencerowelement.testrowelement rowelement) {         }    } }

please can explain me why compile error in override?

please how fix (without using interface)?

note: testrowelement extends rowelement

error 1

public sequenceitemholder(view itemview) {     super(itemview);     }

object doesn't have constructor taking view parameter. remove super call.

error 2

public abstract void setdata(sequencerowelement.rowelement rowelement) {}

abstract methods should not have body. replace this:

public abstract void setdata(sequencerowelement.rowelement rowelement);

error 3

your overriden method should have same parameter type abstract one.


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