What is significance of import java.io.* in your program?

What is significance of import java.io.* in your program?
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1 Answer

Answer :

A: The line imports all the classes of the java.io package into the current program.
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System.in.read() is being used, the program must specify the .................. clause. A) throws.java.out.IOException B) throws.java.in.IOException C) throws.java.io.IOException D) throws.java.io.InException

Description : System.in.read() is being used, the program must specify the .................. clause. A) throws.java.out.IOException B) throws.java.in.IOException C) throws.java.io.IOException D) throws.java.io.InException

Last Answer : C) throws.java.io.IOException

Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Description : Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Last Answer : D) an interface that defines methods to read primitive data types.

Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Description : Data input is A) an abstract class defined in java.io B) a class we can use to read primitive data types C) an interface that defines methods to open files. D) an interface that defines methods to read primitive data types.

Last Answer : D) an interface that defines methods to read primitive data types.

Match the following. a) Java 1) is a tool for debugging java program b) Javah 2) is a tool for creating C-like header files c) Javap 3) runs java bytecode d) jdb 4) prints java code representation A) a-3, b-2,c-1 B) a-3, b-1, c-4, d-2 C) a-1, b-2, c-3, d-4 D) a-2, b-1, c-3, d-4

Description : Match the following. a) Java 1) is a tool for debugging java program b) Javah 2) is a tool for creating C-like header files c) Javap 3) runs java bytecode d) jdb 4) prints java code representation A) a-3, b-2,c-1 B) a-3, b-1, c-4, d-2 C) a-1, b-2, c-3, d-4 D) a-2, b-1, c-3, d-4

Last Answer : B) a-3, b-1, c-4, d-2

State true or false for Java Program. i) Data members of an interface are by default final ii) An abstract class has implementations of all methods defined inside it. A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

Description : State true or false for Java Program. i) Data members of an interface are by default final ii) An abstract class has implementations of all methods defined inside it. A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

Last Answer : C) i-true, ii-false

State true or false for Java Program. i) All class variables are instance variables ii) All protected methods are friendly methods A) i-false, ii-false B) i-false, ii-true

Description : State true or false for Java Program. i) All class variables are instance variables ii) All protected methods are friendly methods A) i-false, ii-false B) i-false, ii-true

Last Answer : B) i-false, ii-true

The compiled java program can run on any ..................... plateform having Java Virtual Machine (JVM) installed on it. A) program B) java C) hardware D) non java

Description : The compiled java program can run on any ..................... plateform having Java Virtual Machine (JVM) installed on it. A) program B) java C) hardware D) non java

Last Answer : C) hardware

The jdb is used to A) Create a jar archive B) Debug a java program C) Create C header file D) Generate java documentation

Description : The jdb is used to A) Create a jar archive B) Debug a java program C) Create C header file D) Generate java documentation

Last Answer : B) Debug a java program

The command javac A) Converts a java program into binary code B) Converts a java program into bytecode C) Converts a java program into machine language D) None of the above.

Description : The command javac A) Converts a java program into binary code B) Converts a java program into bytecode C) Converts a java program into machine language D) None of the above.

Last Answer : B) Converts a java program into bytecode

The command javac is used to A) debug a java program B) compile a java program C) interpret a java program D) execute a java program

Description : The command javac is used to A) debug a java program B) compile a java program C) interpret a java program D) execute a java program

Last Answer : B) compile a java program

Which one of the following is correct? (A) Java applets cannot be written in any programming language (B) An applet is not a small program. (C) An applet can be run on its own. (D) Applets are embedded in another applications.

Description : Which one of the following is correct? (A) Java applets cannot be written in any programming language (B) An applet is not a small program. (C) An applet can be run on its own. (D) Applets are embedded in another applications. 

Last Answer : (D) Applets are embedded in another applications.

Consider the following JAVA program: public class First { public static int CBSE (int x) { if (x < 100) x = CBSE (x +10); return (x - 1); } public static void main (String[] args){ System.out.print(First.CBSE(60)); } } What does this program print? (1) 59 (2) 95 (3) 69 (4) 99

Description : Consider the following JAVA program: public class First { public static int CBSE (int x) { if (x < 100) x = CBSE (x +10); return (x - 1); } public static void main (String[] args){ System.out.print(First.CBSE(60)); } } What does this program print? (1) 59 (2) 95 (3) 69 (4) 99

Last Answer : (2) 95 

(i) What is the significance of the coal deposits of Chhattisgarh ? (ii) Which country import the iron ore deposits of Chhattisgarh ? -Geography

Description : (i) What is the significance of the coal deposits of Chhattisgarh ? (ii) Which country import the iron ore deposits of Chhattisgarh ? -Geography

Last Answer : (i) They are used in the iron and steel industries of Eastern India and also a major item of export. (ii) China.

What is the default java package?

Description : What is the default java package?

Last Answer : A: java.lang

Name the primitive data-types in java.

Description : Name the primitive data-types in java.

Last Answer : A: byte, short, int, long, float, double, char and boolean

Mention other ways in which java handles exceptions.

Description : Mention other ways in which java handles exceptions.

Last Answer : A: Java can handle exception using the try-catch block, throws keyword and throw keyword.

Why did you write java.util package? (only if you use classes like Scanner or StringTokenizer)

Description : Why did you write java.util package? (only if you use classes like Scanner or StringTokenizer)

Last Answer : A: To include the functions of the Scanner or StringTokenizer class from the java.util package.

What is Inheritance? How is it implemented in Java?

Description : What is Inheritance? How is it implemented in Java?

Last Answer : A: The ability of a class to adopt/share the properties (data and functions) completely or partially from another class is called Inheritance. In Java, it is implemented by the use of the keyword, extends.

What is Polymorphism? How is it implemented in Java?

Description : What is Polymorphism? How is it implemented in Java?

Last Answer : A: It literally means the ability to take ‘more than one forms’. The ability of a method to behave in more than one form is called polymorphism. In Java, it is implemented by method (function) overloading (compile time polymorphism) and method overriding (runtime polymorphism).

What is Data Abstraction? How is it implemented in Java?

Description : What is Data Abstraction? How is it implemented in Java?

Last Answer : A: Act of representing only essential features without including its background details is called Abstraction. Data Abstraction can also be defined as the process of hiding the implementation details and showing ... Java, it is implemented by the use of interfaces or by making the class abstract.

What is Encapsulation? How is it implemented in Java?

Description : What is Encapsulation? How is it implemented in Java?

Last Answer : A: Binding up of data and associated functions together into a single unit called (class) is called Encapsulation. In Java, it is implemented by the use of a class.

Is Java an Object Oriented language?

Description : Is Java an Object Oriented language?

Last Answer : A: Yes.

State true or false. i) comparisons precede logical operations in java ii) assignment operations succeed increment operations iii) arithmetic operations succeed comparisons iv) x precede + A) i-true, ii-true, iii-false, iv-true B) i-true, ii-false, iii-true, iv-false C) i-false, ii-true, iii-false, iv-false D) i-true, ii-false, iii-false, iv-true

Description : State true or false. i) comparisons precede logical operations in java ii) assignment operations succeed increment operations iii) arithmetic operations succeed comparisons iv) x precede + A) i-true, ii-true, iii-false, ... false, ii-true, iii-false, iv-false D) i-true, ii-false, iii-false, iv-true

Last Answer : A) i-true, ii-true, iii-false, iv-true

Each method in a java class must have a unique name . A) Not necessary B) True C) False D) None of the above

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In java, string is a ............. A) primitive data type B) abstract data type C) combination of boolean D) None of the above

Description : In java, string is a ............. A) primitive data type B) abstract data type C) combination of boolean D) None of the above

Last Answer : B) abstract data type

The concept of multiple inheritance is implemented in Java by A) extending two or more classes B) extending one class and implementing one or more interfaces C) implementing two or more interfaces D) both B and C

Description : The concept of multiple inheritance is implemented in Java by A) extending two or more classes B) extending one class and implementing one or more interfaces C) implementing two or more interfaces D) both B and C

Last Answer : D) both B and C

The concept of multiple inheritance is implemented in Java by A) extending two or more classes B) extending one class and implementing one or more interfaces C) implementing two or more interfaces D) both B and C

Description : The concept of multiple inheritance is implemented in Java by A) extending two or more classes B) extending one class and implementing one or more interfaces C) implementing two or more interfaces D) both B and C

Last Answer : D) both B and C

State true or false. i) init() is called after start() in applet ii) applets are used for networking iii) inheritance is a part of Java Foundation Classes iv) final does not prevent inheritance A) i-true, ii-true, iii-false, iv-true B) i-false, ii-false, iii-false, iv-false C) i-true, ii-true, iii-true, iv-true D) i-true, ii-false, iii-false, iv-false

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Last Answer : B) i-false, ii-false, iii-false, iv-false

State true or false for the following statements in Java. i) Java beans slow down software development process. ii) Java Servlets do not have built in multithreading feature. A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

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Last Answer : A) i-false, ii-false

............... package is used by compiler itself. So it does not need to be imported for use. A) java.math B) java.awt C) java.applet D) java.lang

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The class string belongs to ................... package. A) java.awt B) java.lang C) java.applet D) java.string

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JSP embeds in ................ in ...................... A) Servlet, HTML B) HTML, Java C) HTML, Servlet D) Java, HTML

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In Java servlet method init( ) is called ..................... times. A) 1 B) 2 C) 0 D) multiple

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In JDBC ........................ imports all Java classes concerned with database connectivity. A) javax.sql.* B) java.mysql.* C) java.sql.* D) com.*

Description : In JDBC ........................ imports all Java classes concerned with database connectivity. A) javax.sql.* B) java.mysql.* C) java.sql.* D) com.*

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In the second type the information written in java after // is ignored by the ....................... A) Interpreter B) Compiler C) Programmer D) All of the above

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Last Answer : B) Compiler

The third type of comment is used by a tool called .................. for automatic generation of documentation. A) Java commenting B) Java generator C) Java doc D) Java loc

Description : The third type of comment is used by a tool called .................. for automatic generation of documentation. A) Java commenting B) Java generator C) Java doc D) Java loc

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In java, ............. can only test for equality, where as ............ can evaluate any type of the Boolean expression. A) switch, if B) if, switch C) if, break D) continue, if

Description : In java, ............. can only test for equality, where as ............ can evaluate any type of the Boolean expression. A) switch, if B) if, switch C) if, break D) continue, if

Last Answer : A) switch, if

In Java variables, if first increment of the variable takes place and then the assignment occurs. This operation is also called ............................. . A) pre increment B) post increment C) incrementation D) pre incrementation

Description : In Java variables, if first increment of the variable takes place and then the assignment occurs. This operation is also called ............................. . A) pre increment B) post increment C) incrementation D) pre incrementation

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In order to run JSP .................... is required. A) Mail Server B) Applet viewer C) Java Web Server D) Database connection

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Java Servlet i) is key component of server side java development ii) is a small pluggable extension to a server that enhances functionality iii) runs only in Windows Operating System iv) allows developers to customize any java enabled server A) i, ii & iii are ture B) i, iii & iv are true C) ii, iii & iv are true D) i, ii & iv are true

Description : Java Servlet i) is key component of server side java development ii) is a small pluggable extension to a server that enhances functionality iii) runs only in Windows Operating System iv) allows developers to customize any java ... & iv are true C) ii, iii & iv are true D) i, ii & iv are true

Last Answer : D) i, ii & iv are true

All java classes are derived from A) java.lang.Class B) java.util.Name C) java.lang.Object D) java.awt.Window

Description : All java classes are derived from A) java.lang.Class B) java.util.Name C) java.lang.Object D) java.awt.Window

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Which of the following is not the java primitive type A) Byte B) Float C) Character D) Long double

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Which of the following is true about Java. A) Java does not support overloading. B) Java has replaced the destructor function of C++ C) There are no header files in Java. D) All of the above.

Description : Which of the following is true about Java. A) Java does not support overloading. B) Java has replaced the destructor function of C++ C) There are no header files in Java. D) All of the above.

Last Answer : D) All of the above

Native – protocol pure Java converts ……….. into the ………… used by DBMSs directly. A) JDBC calls, network protocol B) ODBC class, network protocol C) ODBC class, user call D) JDBC calls, user call

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Last Answer : A) JDBC calls, network protocol

Which is the root class of all AWT events A) java.awt.ActionEvent B) java.awt.AWTEvent C) java.awt.event.AWTEvent D) java.awt.event.Event

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Java servlets are an efficient and powerful solution for creating ………….. for the web. A) Dynamic content B) Static content C) Hardware D) Both a and b

Description : Java servlets are an efficient and powerful solution for creating ………….. for the web. A) Dynamic content B) Static content C) Hardware D) Both a and b

Last Answer : A) Dynamic content

Which one of the following is true for Java? A) Java is object oriented and interpreted B) Java is efficient and faster than C C) Java is the choice of everyone. D) Java is not robust.

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Last Answer : A) Java is object oriented and interpreted

Java has its origin in A) C programming language B) PERRL C) COBOL D) Oak programming language

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Last Answer : D) Oak programming language