Basic Java Concepts Assessment

What are the primitive data types in Java?

• text, number, flag

• integer, decimal, character

• byte, short, int, long, float, double, char, boolean

• string, list, map

Which of the following is a valid control structure in Java?

• for loop

• while loop

• switch statement

• if statement

What is the default value of an int variable in Java?

• 1

• -1

• 0

• null

Which statement is used to handle exceptions in Java?

• throw-catch statement

• try-catch statement

• catch-throw statement

• try-finally statement

What is the purpose of the 'break' statement in a switch case?

• To execute all cases sequentially without stopping.

• To define a default case in the switch statement.

• To prevent fall-through and exit the switch case.

• To initiate a loop within the switch case.

Which method is used to read a file in Java?

• PrintWriter

• Scanner

• FileReader

• BufferedReader

What is the size of a float data type in Java?

• 4 bytes

• 16 bytes

• 8 bytes

• 2 bytes

Which of the following is NOT a valid Java identifier?

• 1stVariable

• 1st Variable

• 1st-Variable

• 1stVariable!

What is the output of the following code snippet: System.out.println(5 + 10 + "Hello");?

• 510Hello

• Hello15

• 15Hello

• 15 10Hello

How do you write a for loop in Java?

• for(int i = 0; i < 10; i++) loop body;

• for(i = 0; i < 10; i++) { // loop body }

• for(int i = 0; i < 10; i++) { // loop body }

• for(int i = 0; i < 10; i++) { loop body }