Advanced Java - Interview Questions and Answers

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67. How are Java source code files named?

A Java source code file takes the name of a public class or interface that is defined within the file. A source code file may contain at most one public class or interface. If a public class or interface is defined within a source code file, then the source code file must take the name of the public class or interface.

If no public class or interface is defined within a source code file, then the file must take on a name that is different than its classes and interfaces. Source code files use the .java extension.

68. What is the relationship between the Canvas class and the Graphics class?

A Canvas object provides access to a Graphics object via its paint() method.

69. What are the high-level thread states?

The high-level thread states are ready, running, waiting, and dead.

70. What value does read() return when it has reached the end of a file?

The read() method returns -1 when it has reached the end of a file.

71. Can a Byte object be cast to a double value?

No. An object cannot be cast to a primitive value.

72. What is the difference between a static and a non-static inner class?

A non-static inner class may have object instances that are associated with instances of the class's outer class.

A static inner class does not have any object instances.