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1. Select all correct declarations, or declaration and
initializations of an array?
A) String str[];
B) String str[5] = new String[5];
C) String str[] = new String[] {"string1",
"string2", "string3", "string4", "string5"};
D) String str[] = {"string1","string2",
"string3", "string4", "string5"};
Answer 1:
2. Which of the
following are the java keywords?
A) final
B) Abstract
C) Long
D) static
Answer 2:
3. The
synchronized is used in which of the following?
A) Class declarations.
B) Method declarations.
C) Block of code declarations
D) Variable declarations.
Answer 3:
4. What will be
printed when you execute the code?
class A {
A() {
System.out.println("Class A
Constructor");
}
}
public class B extends A {
B() {
System.out.println("Class B
Constructor");
}
public static void main(String
args[]) {
B b = new B();
}
}
A) Class A Constructor followed by Class
B Constructor
B) Class B Constructor followed by Class A
Constructor
C) Compile time error
D) Run time error
Answer 4:
5. Given the
piece of code, select the correct to replace at the comment line?
class A {
A(int i) { }
}
public class B extends A {
B() {
// xxxxx
}
public static void main(String
args[]) {
B b = new B();
}
}
A) super(100);
B) this(100);
C) super();
D) this();
Answer 5:
6. Which of the
statements are true?
A) Overridden methods have the same
method name and signature
B) Overloaded methods have the same method
name and signature
C) Overridden methods have the same method
name and different signature
D) Overloaded methods have the same method
name and different signature
Answer 6:
7. What is the
output when you execute the following code?
int i = 100;
switch (i) {
case 100:
System.out.println(i);
case 200:
System.out.println(i);
case 300:
System.out.println(i);
}
A) Nothing is printed
B) Compile time error
C) The values 100,100,100 printed
D) Only 100 is printed
Answer 7:
8. How can you
change the break statement below so that it breaks out of the inner and
middle loops and continues with the next iteration of the outer loop?
outer: for ( int x =0; x < 3; x++ ) {
middle: for ( int y=0; y < 3; y++
) {
if ( y == 1) {
break;
}
}
}
A) continue middle
B) break middle:
C) break outer:
D) continue
Answer 8:
9. What is the
result of compiling the following code?
import java.io.*;
class MyExp {
void MyMethod() throws IOException,
EOFException {
//............//
}
}
class MyExp1 extends MyExp {
void MyMethod() {
//..........//
}
}
public class MyExp2 extends MyExp1 {
void MyMethod() throws IOException
{
//.........//
}
}
A) Compile time error
B) No compile time error
C) Run-Time error
D) MyMethod() cannot declare IOException in
MyExp2 class
Answer 9:
10. What is the
result when you compile the and run the following code?
public class ThrowsDemo {
static void throwMethod() {
System.out.println("Inside
throwMethod.");
throw new
IllegalAccessException("demo");
}
public static void main(String args[])
{
try {
throwMethod();
} catch (IllegalAccessException
e) {
System.out.println("Caught
" + e);
}
}
}
A) Compilation error
B) Runtime error
C) Compile successfully, nothing is
printed.
D) Inside throwMethod. followed by caught:
java.lang.IllegalAccessExcption: demo
Answer 10:
11. Which of
the following statements about garbage collection are true?
A) The garbage collector runs in low
memory situations
B) You can run the garbage collector when
ever you want.
C) When it runs, it releases the memory
allocated by an object, which is no more in use.
D) Garbage collector immediately runs when
you set the references to null.
Answer 11:
12. From the
following code how many objects are eligible for garbage collection?
String string1 = "Test";
String string2 = "Today";
string1 = null;
string1 = string2;
A) 1
B) 2
C) 3
D) 0
Answer 12:
13. Select all
correct list of keywords or Java reserved words?
A) superclass
B) goto
C) open
D) integer
E) import, package
F) They are all java keywords
Answer 13:
14. Select the
correct anonymous inner class declaration ?
A) new Outer.new Inner
B) new Inner() { }
C) new Inner()
D) Outer.new Inner()
Answer 14:
15. Which of
the following statements are true?
A) An anonymous class cannot have any
constructors
B) An anonymous class can only be created
within the body of a method
C) An anonymous class can only access
static fields of the enclosing class
D) An anonymous class instantiated and
declared in the same place.
Answer 15:
16. Which of
the following class definitions are legal declaration of an abstract
class?
A) class A { abstract void Method() {}
}
B) abstract class A { abstract void
Method() ; }
C) class A { abstract void Method() {System.out.println("Test");}
}
D) class abstract A { abstract void
Method() {} }
Answer 16:
17. What is the
result of compiling the following code?
public class Test {
public static void main ( String[]
args) {
int value;
value = value + 1;
System.out.println(" The
value is : " + value);
}
}
A) Compile and runs with no output
B) Compiles and runs printing out "The
value is 1"
C) Does not compile
D) Compiles but generates run time error
Answer 17:
18. What is the
result of compiling the following code? When you run like given below?
java Test Hello How Are You
public class Test {
public static void main ( String[]
args) {
for ( int i = 0; i <
args.length; i++)
System.out.print(args[i]);
}
}
A) Compile and runs with no output
B) Compiles and runs printing out "HelloHowAreYou"
C) Does not compile
D) Compiles but generates run time error
Answer 18:
19. Which are
the following are java keywords ?
A) goto
B) synchronized
C) extends
D) implements
E) this
F) NULL
Answer 19:
20. What is the
output of the following code?
public class TestLocal {
public static void main(String
args[]) {
String s[] = new String[6];
System.out.print(s[6]);
}
}
A) A null is printed
B) Compile time error
C) Exception is thrown
D) null followed by 0 is printed on the
screen
Answer 20:
21. Which of
the following assignment statements is invalid?
A) long l = 698.65;
B) float f = 55.8;
C) double d = 0x45876;
D) All of the above
Answer 21:
22. What is the
numeric range for a Java int data type?
A) 0 to (2^32)
B) -(2^31) to (2^31)
C) -(2^31) to (2^31 - 1)
D) -(2^15) to (2^15 - 1)
Answer 22:
23. How to
represent number 7 as hexadecimal literal?
-----------
Answer 23:
24. ------- is
the range of the char data type?
Answer 24:
25. Which of
the following method returns the ID of an event?
A) int getID()
B) String getSource()
C) int returnID()
D) int eventID()
Answer 25:
26. Which of
the following are correct, if you compile the following code?
public class CloseWindow extends Frame
implements WindowListener {
public CloseWindow() {
addWindowListener(this);
// This is listener registration
setSize(300, 300);
setVisible(true);
}
public void
windowClosing(WindowEvent e) {
System.exit(0);
}
public static void main(String
args[]) {
CloseWindow CW = new
CloseWindow();
}
}
A) Compile time error
B) Run time error
C) Code compiles but Frame does not listen
to WindowEvents
D) Compile and runs successfully.
Answer 26:
27. Select all
correct answers from the following?
A) Java 1.0 event handling is compatible
with event delegation model in Java 1.1
B) Java 1.0 and Java 1.1 event handling
models are not compatible
C) Event listeners are the objects that
implements listener interfaces.
D) You can add multiple listeners to any
event source, then there is no guarantee that the listeners will be
notified in the order in which they were added.
Answer 27:
28. Given the
byte with a value of 01110111, which of the following statements will
produce 00111011?
A) 0x77 << 1;
B) 0x77 >>> 1;
C) 0x77 >> 1;
D) None of the above
Answer 28:
29. Which of
the following will compile without error?
A) char c = 'a';
B) double d = 45.6;
C) int i = d;
D) int k = 8;
Answer 29:
30. Which of
the following returns true when replace with XXXXXXXXX?
public class TestType {
public static void main(String
args[] ) {
Button b = new
Button("BUTTON");
if( XXXXXXXXX)
{
System.out.print("This is an instance of Button");
}
}
}
A) b instanceof Button
B) Button instanceof b
C) b == Button
D) Button == (Object) b
Answer 30:
31. The
statement X %= 5, can best described as?
A) A equals a divided by 5;
B) A equals A in 5 digit percentage form
C) A equals A modulus 5.
D) None of the above
Answer 31:
32. What will
happen when you attempt to compile and run the following code?
public class MyClass {
public static void main(String args[])
{
String s1 = new String("Test
One");
String s2 = new String("Test
One");
if ( s1== s2 ) {
System.out.println("Both
are equal");
}
Boolean b = new Boolean(true);
Boolean b1 = new
Boolean(false);
if ( b.equals(b1) ) {
System.out.println("These
wrappers are equal");
}
}
}
A) Compile time error
B) Runtime error.
C) No output
D) These wrappers are equal
Answer 32:
33. What is the
result when you try to compile and run the following code?
public class TestBit {
public static void main(String args[])
{
String s = "HelloWorld";
if ((s != null) && (s.length() > 6))
System.out.println("The value of s
is " + s );
}
}
A) Compile time error
B) Runtime error
C) No output is printed
D) The value of s is HelloWorld will be
printed on the screen
Answer 33:
34. Given the
following declaration which of the following statements equals to true
boolean b1 = true;
boolean b2 = false;
A) b1 == b2;
B) b1 || b2;
C) b1 |& b2;
D) b1 && b2;
Answer 34:
35. What is the
result of the following code?
public class MyTest {
int x = 30;
public static void main(String args[])
{
int x = 20;
MyTest ta = new MyTest();
ta.Method(x);
System.out.println("The x
value is " + x);
}
void Method(int y){
int x = y * y;
}
}
A) The x value is 20.
B) The x value is 30.
C) The x value is 400.
D) The x value is 600.
Answer 35:
36. How can you
implement encapsulation.
A) By making methods private and
variable private
B) By making methods are public and
variables as private
C) Make all variable are public and access
them using methods
D) Making all methods and variables as
protected.
Answer 36:
37. Given the
following class definition, which of the following methods could be
legally placed after the comment ?
public class Test{
public void amethod(int i, String
s){}
//Here
}
A) public void amethod(String s, int i){}
B) public int amethod(int i, String s){}
C) public void amethod(int i, String
mystring){}
D) public void Amethod(int i, String s) {}
Answer 37:
38. Given the
following class definition which of the following can be legally placed
after the comment line?
class Base{
public Base(int i){}
}
public class Derived extends Base{
public static void main(String arg[]){
Derived d = new Derived(10);
}
Derived(int i){
super(i);
}
Derived(String s, int i){
this(i);
//Here
}
}
A) Derived d = new Derived();
B) super();
C) this("Hello",10);
D) Base b = new Base(10);
Answer 38:
39. Which of
the following statements are true?
A) An inner class cannot be defined as
private.
B) Static methods can be overridden by
static methods only.
C) Static variables can be called using
class name.
D) Non static variables can be called using
class name.
Answer 39:
40. What does
the following code do?
public class RThread implements Runnable
{
public void run (String s ) {
System.out.println ("Executing
Runnable Interface Thread");
}
public static void main ( String
args []) {
RThread rt = new RThread (
);
Thread t = new Thread (rt);
t.start ( );
}
}
A) The compiler error
B) The runtime error
C) Compiles and prints "Executing Runnable
Interface Thread" on the screen
D) Compiles and does not print any thing on
the screen
Answer 40:
41. Which
statements are true?
A) Threads start() method makes it
eligible to run
B) Thread dies after the run() returns
C) A dead Thread can be started again.
D) A stop() method kills the currently
running Thread
Answer 41:
42. Which of
the following are true?
A) A menu item generates an ActionEvent
B) A menu item generates ItemEvent
C) A menu item generates KeyEvent
D) A menu item generates TextEvent
Answer 42:
43. Default
Layout Managers are concerned ?
A) Frame's default layout manager is
BorderLayout
B) Applet's is FlowLayout
C) Panel's is FlowLayout
D) A Dialog is a pop up window and uses
BorderLayout as default.
Answer 43:
44. Which
statements are true about GridBagLayout ?
A) Weight x and weight y should be 0.0
and 1.0
B) If fill is both, anchor does not make
sense.
C) It divides its territory in to an array
of cells.
D) While constructing GridBagLayout, you
won't tell how many rows and columns the underlying grid has.
Answer 44:
45. Which of
the following are true?
A) gridwidth, gridheight, specifies how
many columns and rows to span.
B) gridx, gridy has
GridBagConstraints.RELATIVE which adds left to right and top to bottom,
still you can specify gridwidth and gridheight except for last component,
which you have to set GridBagConstraints.REMAINDER.
Answer 45:
46. Which of
the following statements are true about the fragment below?
import java.lang.Math;
public class Test {
public static void main(String args[])
{
Math m = new Math();
System.out.println(m.abs(2.6);
}
}
A) Compiler fails at line 1
B) Compiler fails at line 2
C) Compiler fails at the time of Math class
instantiation
D) Compiler succeeds.
Answer 46:
47. What will
be the output of the following line?
public class TestFC {
public static void main(String args[])
{
System.out.println(Math.floor(145.1));
System.out.println(Math.ceil(-145.4));
}
}
A) 145.0 followed by -145.0
B) 150.0 followed by -150.0
C) 145.1 followed by -145.4
Answer 47:
48. Which of
the following prints "Equal"
A) int a = 10; float f = 10;
if ( a = = f) {
System.out.println("Equal");}
B) Integer i = new Integer(10);
Double d = new Double(10);
if ( i = =d) {
System.out.println("Equal");}
C) Integer a = new Integer(10);
int b = 10;
if ( a = = b) {
System.out.println("Equal");}
D) String a = new String("10");
String b = new String("10");
if ( a = = b) {
System.out.println("Equal");}
Answer 48:
49. Which of
the following implement clear notion of one item follows another (order)?
A) List
B) Set
C) Map
D) Iterator
Answer 49:
50. Collection
interface iterator method returns Iterator(like Enumerator), through you
can traverse a collection from start to finish and safely remove elements.
A) true
B) false
Answer 50:
51. Which of
the following places no constraints on the type of elements, order of
elements, or repetition of elements with in the collection.?
A) List
B) Collection
C) Map
D) Set
Answer 51:
52. Which of
the following gives Stack and Queue functionality.?
A) Map
B) Collection
C) List
D) Set
Answer 52:
53. If you run
the following code on a PC from the directory c:\source:
import java.io.*;
class Path {
public static void main(String[] args)
throws Exception {
File file = new File("Ran.test");
System.out.println(file.getAbsolutePath());
}
}
What do you expect the output to be?
Select the one right answer.
A) Ran.test
B) source\Ran.test
C) c:\source\Ran.test
D) c:\source
E) null
Answer 53:
54. Which of
the following will compile without error?
A) File f = new
File("/","autoexec.bat");
B) DataInputStream d = new
DataInputStream(System.in);
C) OutputStreamWriter o = new
OutputStreamWriter(System.out);
D) RandomAccessFile r = new
RandomAccessFile("OutFile");
Answer 54:
55. You have an
8-bit file using the character set defined by ISO 8859-8. You are writing
an application to display this file in a TextArea. The local encoding is
already set to 8859-8. How can you write a chunk of code to read the first
line from this file?
You have three variables accessible to
you:
myfile is the name of the file you
want to read
stream is an InputStream object
associated with this file
s is a String object
Select all valid answers.
A)
InputStreamReader reader = new
InputStreamReader(stream, "8859-8");
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
B)
InputStreamReader reader = new
InputStreamReader(stream);
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
C)
InputStreamReader reader = new
InputStreamReader(myfile, "8859-8");
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
D)
InputStreamReader reader = new
InputStreamReader(myfile);
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
E)
FileReader reader = new
FileReader(myfile);
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
Answer 55:
56. Which of
the following used to read and write to network sockets, which are super
classes of Low level streams?
A) InputStream
B) StreamReaders
C) OutputStream
D) Writers
E) Readers
F) Streams
Answer 56:
57. Low Level
Streams read input as bytes and writes as bytes, then select the correct
declarations of Streams.
A) FileInputStream FIS = new
FileInputStream("test.txt")
B) File file = new File("test.txt");
FileInputStream FIS = new FileInputStream(file)
C) File file = new File("c:\\"); File file1
= new File(file,"test.txt"); FileOutputStream FOS = new
FileOutputStream(file1);
D) FileInputStream FIS = new
FileInputStream("c:\\","test.txt")
Answer 57:
58. Choose all
valid forms of the argument list for the FileOutputStream constructor
shown below:
A) FileOutputStream( FileDescriptor fd )
B) FileOutputStream( String n, boolean a )
C) FileOutputStream( boolean a )
D) FileOutputStream()
E) FileOutputStream( File f )
Answer 58:
59. What is the
class that has "mode" argument such as "r" or "rw" is required in the
constructor:
A) DataInputStream
B) InputStream
C) RandomAccessFile
D) File
Answer 59:
60. What is the
output displayed by the following code?
import java.io.*;
public class TestIPApp {
public static void main(String args[])
throws IOException {
RandomAccessFile file = new
RandomAccessFile("test.txt", "rw");
file.writeBoolean(true);
file.writeInt(123456);
file.writeInt(7890);
file.writeLong(1000000);
file.writeInt(777);
file.writeFloat(.0001f);
file.seek(5);
System.out.println(file.readInt());
file.close();
}
}
Select correct answer:
A) 123456
B) 7890
C) 1000000
D) .0001
Answer 60:
Answers
Answer 1:
A) String str[];
C) String str[] = new String[] {"string1",
"string2", "string3", "string4", "string5"};
D) String str[] = {"string1","string2",
"string3", "string4", "string5"};
Back to Question
1:
Answer 2:
A) final
D) static
Back to Question
2:
Answer 3:
B) Method declarations.
C) Block of code declarations
Back to Question
3:
Answer 4:
A) Class A Constructor followed by Class
B Constructor
Back to Question
4:
Answer 5:
A) super(100);
Back to Question
5:
Answer 6:
A) Overridden methods have the same
method name and signature
D) Overloaded methods have the same method
name and different signature
Back to Question
6:
Answer 7:
C) The values 100,100,100 printed
Back to Question
7:
Answer 8:
B) break middle;
Back to Question
8:
Answer 9:
A) Compile time error
D) MyMethod() cannot throw an exception in
MyExp2 class
Back to Question
9:
Answer 10:
A) Compilation error
Back to
Question 10:
Answer 11:
A) The garbage collector runs in low
memory situations
C) When it runs it releases the memory
allocated by an object, which is no more in use.
Back to
Question 11:
Answer 12:
A) 1
Back to
Question 12:
Answer 13:
B) goto
E) import, package
NOTE: The
keywords 'const' and 'goto' are reserved by Java, even though they are not
currently used in Java. For more information at
http://java.sun.com/docs/books/jls/html/3.doc.html#229308
Back to
Question 13:
Answer 14:
B) new Inner() { }
Back to
Question 14:
Answer 15:
A) An anonymous class cannot have any
constructors
D) An anonymous class instantiated and
declared in the same place.
Back to
Question 15:
Answer 16:
B) abstract class A { abstract void
Method() ; }
Back to
Question 16:
Answer 17:
C) Does not compile
Back to
Question 17:
Answer 18:
B) Compiles and runs printing out "HelloHowAreYou"
Back to
Question 18:
Answer 19:
A) goto
B) synchronized
C) extends
D) implements
E) this
Back to
Question 19:
Answer 20:
C) Exception is thrown
Back to
Question 20:
Answer 21:
A) long l = 698.65;
B) float f = 55.8;
Back to
Question 21:
Answer 22:
C) -(2^31) to (2^31 - 1)
Back to
Question 22:
Answer 23:
0X7, 0x7, 0x07, 0X07
Explanation:
The 7 can be represented any one of the
above mentioned answers.
Back to
Question 23:
Answer 24:
0 to 2^16-1
Back to
Question 24:
Answer 25:
A) int getID()
Back to
Question 25:
Answer 26:
A) Compile time error
Back to
Question 26:
Answer 27:
B) Java 1.0 and Java 1.1 event handling
models are not compatible
C) Event listeners are the objects that
implements listener interfaces.
D) You can add multiple listeners to any
event source, then there is no guarantee that the listeners will be
notified in the order in which they were added.
Back to
Question 27:
Answer 28:
B) 0x77 >>> 1;
C) 0x77 >> 1;
Back to
Question 28:
Answer 29:
A) char c = 'a';
B) double d = 45.6;
D) int k = 8;
Back to
Question 29:
Answer 30:
A) b instanceof Button
Back to
Question 30:
Answer 31:
C) A equals A modulus 5.
Back to
Question 31:
Answer 32:
C) No output
Back to
Question 32:
Answer 33:
D) The value of s is HelloWorld will be
printed on the screen
Back to
Question 33:
Answer 34:
B) b1 || b2;
Explanation:
A) This returns false. == is used as
comparison operator.
B) This returns true. Because of OR
operation.
C) There is no operator like that.
D) This returns false. This is because of
AND operation.
NOTE:
The operators ||, && are called short-circuit operators. The operator || (
OR Operation ) returns true if one operand is true without regard to the
other operand. The operator && ( AND Operation ) returns false if one
operand is false, without regard to the other operand . In our example b1
is true and b2 is false.
Back to
Question 34:
Answer 35:
A) The x value is 20.
Back to
Question 35:
Answer 36:
B) By making methods are public and
variables as private
Back to
Question 36:
Answer 37:
A) public void amethod(String s, int i){}
D) public void Amethod(int i, String s) {}
Back to
Question 37:
Answer 38:
D) Base b = new Base(10);
Explanation:
A) This is wrong because there is no
matching constructor defined in Derived class.
B) The super keyword suppose to be the
first line in the constructor.
C) The this keyword suppose to be first
line in the constructor.
D) This is correct because there is
matching constructor in Base class.
Back to
Question 38:
Answer 39:
C) Static variables can be called using
class name.
Back
to Question 39:
Answer 40:
A) The compiler error
Back to
Question 40:
Answer 41:
A) Threads start() method makes it
eligible to run
B) Thread dies after the run() returns
D) A stop() method kills the currently
running Thread
Back to
Question 41:
Answer 42:
A) A menu item generates an ActionEvent
Back to
Question 42:
Answer 43:
A) Frame's default layout manager is
BorderLayout
B) Applet's is Flow Layout
C) Panel's is Flow Layout
D) A Dialog is a pop up window and uses
BorderLayout as default.
Back to
Question 43:
Answer 44:
B) If fill is both, anchor does not make
sense.
C) It divides its territory in to an array
of cells.
D) While constructing GridBagLayout, you
won't tell how many rows and columns the underlying grid has.
Back to
Question 44:
Answer 45:
A) gridwidth, gridheight, specifies how
many columns and rows to span.
B) gridx, gridy has
GridBagConstraints.RELATIVE which adds left to right and top to bottom,
still you can specify gridwidth and gridheight except for last component,
which you have to set GridBagConstraints.REMAINDER.
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Question 45:
Answer 46:
C) Compiler fails at the time of Math
class instantiation
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Question 46:
Answer 47:
A) 145.0 followed by -145.0
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Question 47:
Answer 48:
A) int a = 10; float f = 10; if ( a = =
f) { System.out.println("Equal");}
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Question 48:
Answer 49:
A) List
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Question 49:
Answer 50:
A) true
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Question 50:
Answer 51:
B) Collection
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Question 51:
Answer 52:
C) List
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Question 52:
Answer 53:
C) c:\source\Ran.test
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Question 53:
Answer 54:
A) File f = new
File("/","autoexec.bat");
B) DataInputStream d = new
DataInputStream(System.in);
C) OutputStreamWriter o = new
OutputStreamWriter(System.out);
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Question 54:
Answer 55:
A)
InputStreamReader reader = new
InputStreamReader(stream, "8859-8");
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
B)
InputStreamReader reader = new
InputStreamReader(stream);
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
E)
FileReader reader = new
FileReader(myfile);
BufferedReader buffer = new
BufferedReader(reader);
s = buffer.readLine();
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Question 55:
Answer 56:
A) InputStream
C) OutputStream
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Question 56:
Answer 57:
A) FileInputStream FIS = new
FileInputStream("test.txt")
B) File file = new File("test.txt");
FileInputStream FIS = new FileInputStream(file)
C) File file = new File("c:\\"); File file1
= new File(file,"test.txt"); FileOutputStream FOS = new
FileOutputStream(file1);
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Question 57:
Answer 58:
A) FileOutputStream( FileDescriptor fd )
B) FileOutputStream( String n, boolean a )
E) FileOutputStream( File f )
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Question 58:
Answer 59:
C) RandomAccessFile
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Question 59:
Answer 60:
B) 7890
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Question 60:
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