JavaCore Test 5

What is the range of values that can be specified for an int.

-215 to 215 - 1

231-1 to 231

-231 to 231 - 1

The range of values is compiler dependent.

Which of the following statements is true?

An exception can be thrown by throws keyword explicitly.

An exception can be thrown by throw keyword explicitly.

What happens when the following program is compiled and executed with the command - java test.


 class test 
 {
 public static void main(String args[])
 {
 if(args.length > 0)
 System.out.println(args.length);
 }
 }

The program compiles and runs and prints 2

The program compiles and runs and prints 1

The program compiles and runs and prints 0

The program compiles and runs but does not print anything.

What happens when the following program is compiled and then the command "java check it out" is executed.


 class check 
 {
 public static void main(String args[]) 
 {
 System.out.println(args[args.length-2]);
 }
 }

The program prints it

The program prints check

The program prints java

The program compiles but generates ArrayIndexOutOfBoundsException exception

What happens when the following class is compiled and run.


 public class test
 {
 public static void main(String args[]) 
 {
 int x = 0, y = 1, z;
 if(x) 
 z = 0;
 else
 z = 1;
 if(y) 
 z = 2;
 else
 z = 3;
 System.out.println(z); 
 }
 }

The program does not compile because of problems in the if statement.

The program prints 3

The program prints 2

The program prints 1

How can you ensure that the memory allocated by an object is freed.

Garbage collection cannot be forced. The programmer cannot force the JVM to free the memory used by an object.

By setting all references to the object to new values (say null).

By calling system.gc() method.

By invoking the free method on the object.

All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java

are immutatable

are serializable

are private

are final

What is the result of compiling and running this program?


 public class test 
 {
 public static void main(String args[])
 {
 int i, j;
 int k = 0;
 j = 2;
 k = j = i = 1;
 System.out.println(k); 
 }
 }

The program compiles and runs printing 2.

The program compiles and runs printing 1.

The program does not compile because of the statement k = j = i = 1;

The program does not compile as k is being read without being initialized.

What all gets printed when the following code is compiled and run.


 class test 
 {
 public static void main(String args[])
 {
 int i[] = {0,1};
 try 
 {
 i[2] = i[0] + i[1];
 }
 catch(ArrayIndexOutOfBoundsException e1)
 {
 System.out.println("1");
 }
 catch(Exception e2) 
 {
 System.out.println("2");
 }
 finally 
 {
 System.out.println(3);
 }
 System.out.println("4"); 
 }
 }

a. 1
b. 2
c. 3
d. 4

1 2 3

1 3 4

4

1 2 4

Which all lines are part of the output when the following code is compiled and run.


 public class test {
 public static void main(String args[]) {
 for(int i = 0; i = 0; j--) {
 if(i == j) continue;
 System.out.println(i + " " + j);
 }
 }
 }
 }

a. 0 0
b. 0 1
c. 0 2
d. 0 3
e. 1 0
f. 1 1
g. 1 2
h. 1 3
i. 2 0
j. 2 1
k. 2 2
l. 2 3

c, d, e, f, g, h, i

b, c, e, j, k, l, f, h, i

b, c, d, e, g, h, i, j, l

a, b, c, d, e, i, j, k, l

What gets printed when the following code is compiled and run.


 public class test {
 public static void main(String args[]) { 
 int i = 1;
 do {
 i--;
 } while (i > 2);
 System.out.println(i);
 }
 }

-1

2

1

0

The code snippet


 if( "Welcome".trim() == "Welcome".trim() )
 System.out.println("Equal");
 else
 System.out.println("Not Equal");

What will be Answer

compile and display NULL

cause a compiler error

compile and display "Not Equal"

compile and display "Equal"

A program needs to store the name, salary, and age of employees in years. Which of the following data types should be used to create the Employee class.
a. char
b. boolean
c. Boolean
d. String
e. int
f. double

d, a, e

d, e, f

a, e, f

a, d, f

Which all lines are part of the output when the following code is compiled and run.


 public class test 
 {
 public static void main(String args[])
 {
 for(int i = 0; i < 3; i++) 
 {
 for(int j = 3; j <= 0; j--) 
 {
 if(i == j) continue;
 System.out.println(i + " " + j);
 }
 }
 }
 }

The program does not print anything.

2 0

1 3

1 2

Which of these is a legal definition of a method named m assuming it throws IOException, and returns void. Also assume that the method does not take any arguments.

void m() {} throws IOException

void m(void) throws IOException{}

void m() throw IOException{}

void m() throws IOException{}

Consider the following code snippet. What will be assigned to the variable fourthChar, if the code is executed?
String str = new String("Java");
char fourthChar = str.charAt(4);

null characater

throws StringIndexOutofBoundsException

'v'

'a'

To make a variable defined in a class accessible only to methods defined in the classes in same package, which of the following keyword should be used.

By using the keyword private before the variable.

By using the keyword public before the variable.

By using the keyword protected before the variable.

The variable should not be preceded by any of the above mentioned keywords.

Which all lines are part of the output when the following code is compiled and run.


 public class test 
 {
 public static void main(String args[]) 
 {
 for(int i = 0; i = 0; j--)
 {
 if(i == j) break;
 System.out.println(i + " " + j);
 }
 }
 }
 }

a. 0 0
b. 0 1
c. 0 2
d. 0 3
e. 1 0
f. 1 1
g. 1 2
h. 1 3
i. 2 0
j. 2 1
k. 2 2
l. 2 3
m. 3 0
N. 3 1
O. 3 2
P. 3 3

d, e, f, g, j, k

b, c, d, g, h, l

a, b, c, f, h, i

c, d, g, h, i, k

Which of the following are legal identifier names in Java.
a. %abcd
b. $abcd
c. 1abcd
d. package
e. _a_long_name

a, e

b, e

b, d

a, c

What gets printed on the standard output when the class below is compiled and executed by entering "java test lets see what happens".


 public class test
 {
 public static void main(String args[])
 {
 System.out.println(args[0]+" "+args[args.length-1]);
 }
 }

The program will print - lets happens

The program will throw an ArrayIndexOutOfBounds exception.

The program will print - java what

The program will print - java test