Question 1

Which is true about an anonymous inner class?

It can extend exactly one class and implement exactly one interface.
It can extend exactly one class and can implement multiple interfaces.
It can extend exactly one class or implement exactly one interface.
It can implement multiple interfaces regardless of whether it also extends a class.

Answer

Correct Option: C

Question 2

class Boo {
    Boo(String s) {}
    Boo() {}
}
class Bar extends Boo {
    Bar() {}
    Bar(String s) {
        super(s);
    }
    void zoo() { 
         // insert code here      
    }  
}

which one create an anonymous inner class from within class Bar?

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Boo f = new Boo(24) { };
Boo f = new Bar() { };
Bar f = new Boo(String s) { };
Boo f = new Boo.Bar(String s) { };

Answer

Correct Option: B

Question 3

Which is true about a method-local inner class?

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It must be marked final.
It can be marked abstract.
It can be marked public.
It can be marked static.

Answer

Correct Option: B

Question 4

Which constructs an anonymous inner class instance?

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Runnable r = new Runnable() { };
Runnable r = new Runnable(public void run() { });
Runnable r = new Runnable { public void run(){}};
System.out.println(new Runnable() {public void run() { }});

Answer

Correct Option: D

Question 5

public class MyOuter {
    public static class MyInner {
        public static void foo() {}
    }
}

which statement, if placed in a class other than MyOuter or MyInner, instantiates an instance of the nested class?

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MyOuter.MyInner m = new MyOuter.MyInner();
MyOuter.MyInner mi = new MyInner();
MyOuter m = new MyOuter(); MyOuter.MyInner mi = m.new MyOuter.MyInner();
MyInner mi = new MyOuter.MyInner();

Answer

Correct Option: A

Question 6

Which of these is /are SYNON relations?

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defined as
refers
owned by
defined by
includes
has

Answer

Correct Option: A,C,E,F

Question 7

Which is not a file to field relation

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known as
has
qualified by
includes
refers to
qualified as

Answer

Correct Option: A,D,E,F

Question 8

Which is not a file to file relation

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defined as
refers
owned by
includes
extended by
known by

Answer

Correct Option: B,F

Question 9

Which is a non-keyed access path

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Physical
Update
Resequence
Retrieval
Span
Query

Answer

Correct Option: A

Question 10

How many types of access paths are there in SYNON

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6
5
7
8
4
9

Answer

Correct Option: A

Question 11

What is the output of the below JavaScript?
alert(Math.sqrt(-16));

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-4
4
Error
NaN

Answer

Correct Option: D

Question 12

What is the output of the below JavaScript?


with(Math){               
     alert(pow(2,3));       
}

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8
9
error
6

Answer

Correct Option: A

Question 13

What is the output of the below JavaScript?


alert(parseInt("8.56") + " " + parseInt("8error"));

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Error
98
88
16

Answer

Correct Option: C

Question 14

What is the output of the below JavaScript?
alert(parseFloat("8.56"));

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8.56
9
error
NaN

Answer

Correct Option: A

Question 15

What is the output of the below JavaScript?


    var currDate = new Date("30 September, 2011");
    alert(currDate.getMonth());

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9
8
10
error

Answer

Correct Option: B

Question 16


function Book(id, name) {
    this.id = id;
    this.name = name;
}
var book = new Book("1001", "Head First JavaScript");
alert(book.id);

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1001
error
Head First JavaScript
id

Answer

Correct Option: A

Question 17

What is the output of the below JavaScript?


var book = "Head First JavaScript";         
alert(book.length);

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21
20
22
error

Answer

Correct Option: A

Question 18


a = 10;         
var b = 20;         
var c = a + b;          
alert(c);

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error
1020
30
20

Answer

Correct Option: C

Question 19


var personObj = new Object();       
personObj.firstname = "Jerome";         
personObj.lastname = "Davin";       
alert(personObj.firstname);

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Jerome
Davin
error
firstname

Answer

Correct Option: A

Question 20

What is the output of the below JavaScript?


var personObj = {firstname:"Jerome",lastname:"Davin"};          
alert(personObj.lastname);

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Davin
Jerome
error
lastname

Answer

Correct Option: A

Description: programming languages Online Quiz - 9
Number of Questions: 20
Created by: Aliensbrain Bot
Tags: programming languages

programming languages Online Quiz - 9

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