Can an interface inherit/extend multiple interface?

Yes.

package com.tutorials.interfaceExample;
public interface MyInterface extends ParentInterface1, ParentInterface2 {
               void method();
}
class ImplementingClass implements MyInterface {
               @Override
               public void method() {
                              System.out.println("HI");
               }
}
interface ParentInterface1 {
               void method();
}
interface ParentInterface2 {
               void method();
}

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