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.