Java language Questions and Answers

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Java Language Fundamental
MCQ Question and Answer
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2. Rumman Ansari || www.atnyla.com Java Language Fundamental
Q Java is a _________ language.
A. weakly typed
B. strogly typed
C. moderate typed
D. None of these
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Q Which is a valid keyword in java?
A. interface
B. string
C. Float
D. unsigned
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Q Which is a reserved word in the Java programming language?
A. method
B. native
C. subclasses
D. reference
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Q Which will legally declare, construct, and initialize an array?
A. int [] myList = {"1", "2", "3"};
B. int [] myList = (5, 8, 2);
C. int myList [] [] = {4,9,7,0};
D. int myList [] = {4, 3, 7};
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Q Which one of these lists contains only Java programming language
keywords?
A. class, if, void, long, Int, continue
B. goto, instanceof, native, finally, default, throws
C. try, virtual, throw, final, volatile, transient
D. strictfp, constant, super, implements, do
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Q Which four options describe the correct default values for array elements of
the types indicated?
1. int -> 0
2. String -> "null"
3. Dog -> null
4. char -> 'u0000'

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5. float -> 0.0f
6. boolean -> true
A. 1, 2, 3, 4
B. 1, 3, 4, 5
C. 2, 4, 5, 6
D. 3, 4, 5, 6
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Q Which three are legal array declarations?
1. int [] myScores [];
2. char [] myChars;
3. int [6] myScores;
4. Dog myDogs [];
5. Dog myDogs [7];
A. 1, 2, 4
B. 2, 4, 5
C. 2, 3, 4
D. All are correct.
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Q
public interface Foo
{
int k = 4; /* Line 3 */
}
Which three piece of codes are equivalent to line 3?
1. final int k = 4;
2. public int k = 4;
3. static int k = 4;
4. abstract int k = 4;
5. volatile int k = 4;
6. protected int k = 4;

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A. 1, 2 and 3
B. 2, 3 and 4
C. 3, 4 and 5
D. 4, 5 and 6
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Q Which one of the following will declare an array and initializeit with five
numbers?
A. Array a = new Array(5);
B. int [] a = {23,22,21,20,19};
C. int a [] = new int[5];
D. int [5] array;
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Q Which three are valid declarations of a char?
1. char c1 = 064770;
2. char c2 = 'face';
3. char c3 = 0xbeef;
4. char c4 = u0022;
5. char c5 = 'iface';
6. char c6 = 'uface';
A. 1, 2, 4
B. 1, 3, 6
C. 3, 5
D. 5 only
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Q Which is the valid declarations within an interface definition?
A. public double methoda();
B. public final double methoda();
C. static void methoda(double d1);
D. protected void methoda(double d1);
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Q Which one is a valid declaration of a boolean?
A. boolean b1 = 0;
B. boolean b2 = 'false';
C. boolean b3 = false;

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D. boolean b4 = Boolean.false();
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Q Which three are valid declarations of a float?
1. float f1 = -343;
2. float f2 = 3.14;
3. float f3 = 0x12345;
4. float f4 = 42e7;
5. float f5 = 2001.0D;
6. float f6 = 2.81F;
A. 1, 2, 4
B. 2, 3, 5
C. 1, 3, 6
D. 2, 4, 6
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Q Which is a valid declarations of a String?
A. String s1 = null;
B. String s2 = 'null';
C. String s3 = (String) 'abc';
D. String s4 = (String) 'ufeed';
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Q What is the numerical range of a char?
A. -128 to 127
B. -(215) to (215) - 1
C. 0 to 32767
D. 0 to 65535
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Q What will be the output of the program?
public class CommandArgsThree
{
public static void main(String [] args)
{
String [][] argCopy = new String[2][2];
int x;
argCopy[0] = args;

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x = argCopy[0].length;
for (int y = 0; y < x; y++)
{
System.out.print(" " + argCopy[0][y]);
}
}
}
What will be the output of the program? public class CommandArgsThree {
publ
A. 0 0
B. 1 2
C. 0 0 0
D. 1 2 3
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Q What will be the output of the program?
public class CommandArgs
{
public static void main(String [] args)
{
String s1 = args[1];
String s2 = args[2];
String s3 = args[3];
String s4 = args[4];
System.out.print(" args[2] = " + s2);
}
}
and the command-line invocation is > java CommandArgs 1 2 3 4
A. args[2] = 2
B. args[2] = 3
C. args[2] = null
D. An exception is thrown at runtime.
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Q
public class F0091

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{
public void main( String[] args )
{
System.out.println( "Hello" + args[0] );
}
}
What will be the output of the program, if this code is executed with the
command line: > java F0091 world
A. Hello
B. Hello Foo91
C. Hello world
D. The code does not run.
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Q What will be the output of the program?
public class TestDogs
{
public static void main(String [] args)
{
Dog [][] theDogs = new Dog[3][];
System.out.println(theDogs[2][0].toString());
}
}
class Dog { }
A. null
B. theDogs
C. Compilation fails
D. An exception is thrown at runtime
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Q What will be the output of the program ?
public class Test
{
public static void main(String [] args)
{

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signed int x = 10;
for (int y=0; y<5; y++, x--)
System.out.print(x + ", ");
}
}
A. 10, 9, 8, 7, 6,
B. 9, 8, 7, 6, 5,
C. Compilation fails.
D. An exception is thrown at runtime.
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Q What will be the output of the program?
public class CommandArgsTwo
{
public static void main(String [] argh)
{
int x;
x = argh.length;
for (int y = 1; y <= x; y++)
{
System.out.print(" " + argh[y]);
}
}
}
and the command-line invocation is
> java CommandArgsTwo 1 2 3
A. 0 1 2
B. 1 2 3
C. 0 0 0
D. An exception is thrown at runtime
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Q In the given program, how many lines of output will be produced?

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public class Test
{
public static void main(String [] args)
{
int [] [] [] x = new int [3] [] [];
int i, j;
x[0] = new int[4][];
x[1] = new int[2][];
x[2] = new int[5][];
for (i = 0; i < x.length; i++)
{
for (j = 0; j < x[i].length; j++)
{
x[i][j] = new int [i + j + 1];
System.out.println("size = " + x[i][j].leng
A. 7
B. 9
C. 11
D. 13
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Q What will be the output of the program?
public class X
{
public static void main(String [] args)
{
String names [] = new String[5];
for (int x=0; x < args.length; x++)
names[x] = args[x];
System.out.println(names[2]);
}
}
and the command line invocation is
> java X a b

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A. names
B. null
C. Compilation fails
D. An exception is thrown at runtime
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Q Size of int in Java is
A. 16 bit
B. 32 bit
C. 64 bit
D. Depends on execution environment
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Q The implicit return type of a constructor is
A. void
B. A class object in which it is defined.
C. There is no return type.
D. None of the above
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