Java Interview Questions -Part 14

40. What is an Iterator interface?
The Iterator interface is used to step through the elements of a Collection.
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41. How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?
Unicode requires 16 bits and ASCII require 7 bits. Although the ASCII character set uses only 7 bits, it is usually represented as 8 bits. UTF-8 represents characters using 8, 16, and 18 bit patterns. UTF-16 uses 16-bit and larger bit patterns.
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42. What is the difference between yielding and sleeping?
When a task invokes its yield() method, it returns to the ready state. When a task invokes its sleep() method, it returns to the waiting state.
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43. Is sizeof a keyword?
The sizeof operator is not a keyword in Java.
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44. What are wrapped classes?
Wrapped classes are classes that allow primitive types to be accessed as objects.
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45. Does garbage collection guarantee that a program will not run out of memory?
No, it doesn't. It is possible for programs to use up memory resources faster than they are garbage collected. It is also possible for programs to create objects that are not subject to garbage collection