Quiz
java
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Perguntas do quiz (30)
1Which of the following are legal lines of Java code?
1. int w = (int)888.8;
2. byte x = (byte)100L;
3. long y = (byte)100;
4. byte z = (byte)100L;- A1 and 2
- B2 and 3
- C3 and 4
- Dall are correct
2what will be the output of the program
public class Test3
{ public static void main(String a[])
{ int x=10;
for(int y=0;y<5;y++,x--)
System.out.print(x+" , ");
}
}- A10,9,8,7,6,
- B9,8,7,6,5,
- CCompilation fails
- DAn exception is thrown at runtime
3Which of these is an incorrect array declaration?
- Aint arr[] = new int[5]
- Bint [] arr = new int[5]
- Cint arr[][] = new int[5]
- Dint arr[] = int [5] new
4class While
{public static void main(String a[])
{ int x=0;
while(1) //line 6
{
System.out.print("x plus one is "+(x+1)); //line 8
}
}
}
Which statement is true?- A(a)There is a syntax error on line 1
- BThere is a syntax error on line 6
- CThere is a syntax error on line 1,6& 8
- DNo Error
5what will be the output of the program?
class Demo
{
public static void main(String a[])
{
int x=0;
float y=10.0;
System.out.println(x+" "+y);
}
}- A0 10.0
- B0 10
- Ccompilation error
- D) run time error
6 Arrays in Java are implemented as?
- Aclass
- Bobject
- Cvariable
- Dnon of the above
7Which of these functions is called to display the output of an applet
- Adisplay()
- Bpaint()
- Cdisplayapplet()
- DpaintApplet()
815.What is the output of this program?
class output
{
public static void main(String args[])
{
String a="hello i love java";
System.out.println(indexof('i')+" "+indexof('o')+" "
+lastIndexof('i')+" "+lastIndexof('o') ));
}
}- A6 4 6 9
- B5 4 5 9
- C7 4 7 9
- D8 4 8 9
9What is the output of this program?
class array_output
{
public static void main(String args[])
{
int array_variable [] = new int[10];
for (int i = 0; i < 10; ++i)
{
array_variable[i] = i;
System.out.print(array_variable[i] + " ");
i++;
}
}
}- A0 1 2 3 4
- B2 3 4 5 6
- C0 2 4 6 8
- D8 7 6 5 4
10Which statement is true about java?
- ASequence dependent programming language
- Bcode dependent programming language
- CPlatform dependent programming language
- DPlatform independent programming language
1117.What is the output of this program?
class string_class
{
public static void main(String args[])
{
String obj = "I LIKE JAVA";
System.out.println(obj.charAt(3));
}
}- Ai
- Bl
- Ck
- De
12. class VarArgs
{
public static void main(String x[])
{
int a[]={1,2,3,4,5};
for(int i:a)
System.out.print(i+" ");
}- A1 3 4 5 2
- B5 4 3 2 1
- C1 2 3 4 5
- D3 4 5 2 1
13Where is array stored in memory?
- Aheap space
- Bstack space
- C) heap space and stack space
- Dfirst generation memory
14What is the output of this program?
class Output
{
public static void main(String args[])
{
Integer i = new Integer(257);
byte x = i.byteValue();
System.out.print(x);
}
}- A0
- B1
- C256
- D257
15Which of these is a protocol for breaking and sending packets to an address across a network?
- ATCIP/IP
- BDNS
- Csocket
- Dproxy server
16What is the output of this program?
import java.net.*;
class networking
{
public static void main(String[] args) throws UnknownHostException
{
InetAddress obj1 = InetAddress.getByName("cisco.com");
InetAddress obj2 = InetAddress.getByName("sanfoundary.com");
boolean x = obj1.equals(obj2);
System.out.print(x);
}
}- A0
- B1
- Ctrue
- Dfalse
17What is the output of this program?
class Output
{
public static void main(String args[])
{
Object obj = new Object();
System.out.print(obj.getclass());
}
}- AObject
- Bclass Object
- Cclass java.lang.Object
- DCompilation Error
18What is the output of this program?
class A
{
public int i;
protected int j;
}
class B extends A
{
int j;
void display()
{
super.j = 3;
System.out.println(i + " " + j);
}
}
class Output
{
public static void main(String args[])
{
B obj = new B();
obj.i=1;
obj.j=2;
obj.display();
}
}- A1 2
- B2 1
- C1 3
- D3 1
19 Which of these is the interface of legacy?
- Amap
- Benumeration
- Chash map
- Dhash table
20Which of these method returns an instance of DateFormat that can format time information?
- AgetTime()
- Bv getTimeInstance()
- CgetTimeDateinstance()
- DgetDateFormatinstance()
21Which of these formatting strings of SimpleDateFormat class is used to print week of the year?
- Aw
- BW
- Cs
- DS
22What is the output of this program?
import java.net.*;
class networking
{
public static void main(String[] args) throws Exception
{
URL obj = new URL("http://www.sanfoundry.com/javamcq");
URLConnection obj1 = obj.openConnection();
System.out.print(obj1.getContentType());
}
}- Ahtml
- Btext
- Chtml/text
- Dtext/html
23. public class Test
{
public static void main(String a[])
{
for(int i = 0; i < 3; i++)
{
System.out.print(i);
}
System.out.print(i);
}
}- A1 2 3
- B0 1 2 3
- Cerror
- Drun time error
24What is the type of variable ‘b’ and ‘d’ in the below snippet?
int a[], b;
int []c, d;- A) ‘b’ and ‘d’ are int
- B‘b’ and ‘d’ are arrays of type int
- C‘b’ is int variable; ‘d’ is int array
- D) ‘d’ is int variable; ‘b’ is int array
25 Which of these method is used to make a bit zero specified by the index?
- Aput()
- Bset()
- Cremove()
- Dclear()
26What is the output of this program?
import java.util.*;
class Bitset
{
public static void main(String args[])
{
BitSet obj = new BitSet(5);
for (int i = 0; i < 5; ++i)
obj.set(i);
System.out.print(obj.get(3));
}
}- A2
- B3
- C4
- D5
27What is serialization?
- ATurning object in memory into stream of bytes
- BTurning stream of bytes into an object in memory
- CTurning object in memory into stream of bits
- DTurning object in memory into stream bits
28Which of these methods must be made static?
- Amain()
- Bdelete()
- Crun()
- Dfinalise()
29Will this program generate same output when executed again?
class Output
{
public static void main(String args[])
{
int y = double z = Math.random();
System.out.print(y);
}
}- Ayes
- Bno
30What is the output of this program?
import java.util.*;
class hashtable
{
public static void main(String args[])
{
Hashtable obj = new Hashtable();
obj.put("A", new Integer(3));
obj.put("B", new Integer(2));
obj.put("C", new Integer(8));
System.out.print(obj.toString());
}
}- A{C=8, B=2}
- B[C=8, B=2].
- C{A=3, C=8, B=2}
- D[A=3, C=8, B=2].
Informações
- Descrição
- Quiz sobre java, criado por rahul errabelly em 19-01-2018.
- Autor
- rahul errabelly
- Idioma
- English
- Visualizações
- 3
- Avaliação
- Ainda sem avaliações Avalie este quiz