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Question
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Option1
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Option2
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Option3
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Option4
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Option5
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Answer
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Which of the following are true?
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The Void class extends the Class class
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The Float class extends the Double class.
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The System class extends the Runtime class.
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The Integer class extends the Number class.
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None Of These
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D
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Exceptions can be caught or rethrown to a calling method.
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True
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False
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A
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Because finalize () belongs to the java.lang.Object class, it is present in all ___.
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objects
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classes
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methods
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B
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The this reference is used in conjunction with ___methods.
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static
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non-static
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B
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Which of the following statements can be used to describe a public method?
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It is accessible to all other classes in the hierarchy
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It is accessablde only to subclasses of its parent class
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It represents the public interface of its class
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The only way to gain access to this method is by calling one of the public class methods
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Both A,C
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E
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The switch statement does not require a break.
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True
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False
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B
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Delete
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Character literals are stored as unicode characters.
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True
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False
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A
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Delete
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Strings are instances of the class String.
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True
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False
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A
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Delete
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What is default layout manager for panels and applets?
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Flowlayout
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Gridlayout
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BorderLayout
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A
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Delete
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Which one of the following does not extends java.awt.Component
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CheckBox
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Canvas
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CheckbocGroup
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Label
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C
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Which one does not have a valueOf(String) method
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Integer
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Boolean
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Character
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Long
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Short
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C
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Which of the following are Java reserved words?
1. run
2. import
3. default
4. implement
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1 and 2
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2 and 3
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3 and 4
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2 and 4
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1,2,3 and 4
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B
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Delete
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You need to store elements in a collection that guarantees that no duplicates are stored. Which one of the following interfaces provide that capability?
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Java.util.Map
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Java.util.List
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Java.util.Collection
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None of the above
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A
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Delete
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What allows the programmer to destroy an object x?
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x.delete()
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x.finalize()
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Runtime.getRuntime().gc()
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Only the garbage collection system can destroy an object.
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D
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Which of the following are valid calls to Math.max?
1. Math.max(1,4)
2. Math.max(2.3, 5)
3. Math.max(1, 3, 5, 7)
4. Math.max(-1.5, -2.8f)
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1, 2 and 4
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2, 3 and 4
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1, 2 and 3
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2, 3 and 4
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A
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Which will contain the body of the thread?
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run();
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start();
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stop();
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main();
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A
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Delete
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Which two of the following methods are defined in class Thread?
1. start()
2. wait()
3. notify()
4. run()
5. terminate()
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1 and 4
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2 and 3
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3 and 4
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2 and 4
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A
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Which is true about a method-local inner class?
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It must be marked final.
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It can be marked abstract.
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It can be marked public.
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It can be marked static.
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B
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What is the numerical range of a char?
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-128 to 127
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-215to 215
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0 to 32767
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0 to 65535
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D
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Delete
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Which is a valid keyword in java?
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unsigned
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interface
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string
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Float
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B
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