Java Control Statements

1.		Which control flow statement is used to execute a set of statements at least once?

while loop

do-while loop

for loop

if statement

2.		What is the difference between a switch statement and a series of if-else statements in Java?

A switch statement can only test for equality, while if-else statements can test for any condition.

A switch statement can test for any condition, while if-else statements can only test for equality.

A switch statement is more efficient than a series of if-else statements for testing a single variable against multiple values.

There is no difference between a switch statement and a series of if-else statements.

3.		Which control flow statement is used to skip the remaining statements in the current iteration of a loop and move on to the next iteration?

continue

break

return

skip

4.		Which control flow statement is used to jump to a specific label in the code?

continue

break

return

goto

5.		What is the difference between a while loop and a do-while loop in Java?

A while loop runs at least once, while a do-while loop may not run at all.

A while loop always runs exactly once, while a do-while loop may run more than once.

A while loop tests its condition at the beginning of the loop, while a do-while loop tests its condition at the end of the loop.

A while loop is used for iterating over arrays, while a do-while loop is used for iterating over collections.

6.		What is the purpose of the labeled statement in Java?

To define a new variable in the code.

To provide a descriptive name for a loop or if statement.

To mark a specific point in the code that can be jumped to using the goto statement.

To create a custom exception class.

7.		Which of the following is not a valid relational operator in Java?

==

!=

<=

><

8.

What is the output of the following program?

public class Main {
public static void main(String[] args) {
int i = 0;
while (i < 10) {
i++;
if (i % 2 == 0) {
continue;
}
System.out.print(i + " ");
}
}
}

2 4 6 8 10

1 3 5 7 9

2 4 6 8

1 3 5 7

9.

What is the output of the following program?

public class Main {
public static void main(String[] args) {
int i = 0;
do {
System.out.print(i + " ");
i++;
} while(i < 5);
}
}

0 1 2 3 4

1 2 3 4 5

0 1 2 3 4 5

None of the above

10.		Which of the following is true regarding the default case in a switch statement?

It is optional, and is executed if none of the cases match the tested value.

It is mandatory, and must be the last case in the switch statement.

It is executed if the tested value matches any of the cases in the switch statement.

It is used to declare a default value for a variable.