QUIZ ON : JAVA - USING LIBRARY CLASSES

Question No# : 01

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Which of the following is not a wrapper class?
Which of the following is not a wrapper class?

A. ByteByte

B. IntInt

C. LongLong

D. FloatFloat

Question No# : 02

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Which of the following is valid method of initialising?
Which of the following is valid method of initialising?

A. Integer a=new (5); Integer a=new (5);

B. Integer a=Integer(5);Integer a=Integer(5);

C. Integer a=new Integer(5); Integer a=new Integer(5);

D. Integer a=new (“5”);Integer a=new (“5”);

Question No# : 03

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If s=“123”, which among the following will convert it to an integer?
If s=“123”, which among the following will convert it to an integer?

A. int a=Integer(s);int a=Integer(s);

B. int a=(int)s;int a=(int)s;

C. int a=parseInt(s); int a=parseInt(s);

D. int a=Integer.parseInt(a);int a=Integer.parseInt(a);

Question No# : 04

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Which among the following is valid character initialisation?
Which among the following is valid character initialisation?

A. Character c=new Character(‘c’); Character c=new Character(‘c’);

B. Character c=new Character(“c”);Character c=new Character(“c”);

C. Both a and bBoth a and b

D. None of theseNone of these

Question No# : 05

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Which among the following methods return a true or a false?
Which among the following methods return a true or a false?

A. toLowerCase() toLowerCase()

B. toUpperCase()toUpperCase()

C. parseInt() parseInt()

D. isUpperCase() isUpperCase()

Question No# : 06

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What package is a part of the wrapper class which is imported by default into all Java programs?
What package is a part of the wrapper class which is imported by default into all Java programs?

A. java.util java.util

B. java.langjava.lang

C. java.awtjava.awt

D. None of theseNone of these

Question No# : 07

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Which class is inherited by the Character and Boolean wrapper classes?
Which class is inherited by the Character and Boolean wrapper classes?

A. ObjectObject

B. NumberNumber

C. Both a and b Both a and b

D. None of theseNone of these

Question No# : 08

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What is, converting a primitive value into an object of the corresponding wrapper class called?
What is, converting a primitive value into an object of the corresponding wrapper class called?

A. Autoboxing Autoboxing

B. UnboxingUnboxing

C. Type Casting Type Casting

D. All of theseAll of these

Question No# : 09

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Which among the following function is used to check whether a given character is a tab space or not?
Which among the following function is used to check whether a given character is a tab space or not?

A. isTab() isTab()

B. isTabSpace() isTabSpace()

C. isSpace() isSpace()

D. isWhitespace() isWhitespace()

Question No# : 10

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The member ‘out’ object of the ‘System’ class belongs to which class?
The member ‘out’ object of the ‘System’ class belongs to which class?

A. SystemSystem

B. PrintPrint

C. PrintStreamPrintStream

D. PrintlnPrintln