How do Java Interfaces simulate multiple inheritance?

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I am reading "The Java Tutorial" (for the 2nd time). I just got through the section on Interfaces (again), but still do not understand how Java Interfaces simulate multiple inheritance. Is there a clearer explanation than what is in the book?

multiple-inheritance interface java
22 Answers

Between two Java class multiple Inheritance directly is not possible. In this case java recommend Use to interface and declare method inside interface and implement method with Child class. 

interface ParentOne{
   public String parentOneFunction();
}

interface ParentTwo{
    public String parentTwoFunction();
}

class Child implements ParentOne,ParentTwo{

   @Override
    public String parentOneFunction() {
        return "Parent One Finction";
    }

    @Override
    public String parentTwoFunction() {
        return "Parent Two Function";
    }

    public String childFunction(){
       return  "Child Function";
    }
}
public class MultipleInheritanceClass {
    public static void main(String[] args) {
        Child ch = new Child();
        System.out.println(ch.parentOneFunction());
        System.out.println(ch.parentTwoFunction());
        System.out.println(ch.childFunction());
    }
}
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