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Answers to Questions and Exercises: Interfaces

Questions
Question 1: What methods would a class that implements the java.lang.CharSequence interface have to implement?
Answer 1: charAt, length and subSequence.
Question 2: What is wrong with the following interface?
public interface SomethingIsWrong {
    void aMethod(int aValue) {
        System.out.println("Hi Mom");
    }
}
Answer 2: It has a method implementation in it. It should just have a declaration.
Question 3: Fix the interface in Question 2.
Answer 3:
public interface SomethingIsWrong {
    void aMethod(int aValue);
}
Question 4: Is the following interface valid?
public interface Marker {
}
Answer 4: Yes. Methods are not required. Empty interfaces can be used as types and to mark classes without requiring any particular method implementations. For an example of a useful empty interface, see java.io.Serializable.
Exercises

Exercise 1: Write a class that implements the CharSequence interface found in the java.lang package. Select one of the sentences from this book to use as the data. Write a small main method to test your class; make sure to call all four methods.
Answer 1: See CharSequenceDemo.java
Exercise 2: Suppose that you have written a time server, which periodically notifies its clients of the current date and time. Write an interface that the server could use to enforce a particular protocol on its clients.
Answer 2: See TimeClient.java

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JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER, Private JVM (Java Virtual Machine), Private Tomcat Server

Questions

Exercises

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER, Private JVM (Java Virtual Machine), Private Tomcat Server

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
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Private JVM (Java Virtual Machine),
Private Tomcat Server