Java Package Hierarchy Quiz

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What is the purpose of defining a package in Java?

To create a namespace in which classes are stored.

How is a package defined in a Java source file?

By including a package command as the first statement.

What happens if the package statement is omitted in a Java source file?

The classes are put into the default package.

How are packages stored in Java?

Java uses file system directories to store packages. Signup and view all the answers

Is case sensitivity important when specifying package paths in Java?

Yes, case sensitivity is important. Signup and view all the answers

Can multiple files include the same package statement in Java?

Yes, more than one file can include the same package statement. Signup and view all the answers

How can a program be executed from a directory immediately above MyPack?

The program can be executed from a directory immediately above MyPack. Signup and view all the answers

What is one way to set the CLASSPATH to include the path to MyPack?

Set the CLASSPATH to include the path to MyPack. Signup and view all the answers

When using the -classpath option, what must be specified for the path to MyPack?

The path to MyPack must be specified. Signup and view all the answers

What must the class path not include when using the second two options to run the program?

The class path must not include MyPack itself. Signup and view all the answers

What is the recommended approach to try the examples mentioned in the text?

Create the package directories below the current development directory, put the .class files into the appropriate directories, and execute the programs from the development directory. Signup and view all the answers

What is the general form of a multileveled package statement in Java?

package pkg1[.pkg2[.pkg3]]; Signup and view all the answers

How should a package hierarchy be reflected in the file system of a Java development system?

The package hierarchy must match the directory structure in the file system. Signup and view all the answers

Why is it important to choose package names carefully in Java?

You cannot rename a package without renaming the directory where the classes are stored. Signup and view all the answers

How does the Java run-time system know where to look for packages that you create?

The Java run-time system uses the current working directory by default, but you can also set the CLASSPATH environment variable or use the -classpath option. Signup and view all the answers

What must be true for a program to find a package named MyPack in Java?

The package must be in the current working directory, the CLASSPATH environment variable must be set, or the -classpath option must be used with java and javac. Signup and view all the answers

Can you exclude other classes in other files from being part of the same package in Java?

No, other classes in other files can be part of the same package. Signup and view all the answers

Java Package Hierarchy Quiz

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