Java Programming Quiz

Which of the following best describes the role of the Java compiler?

• Executes Java code line by line

• Translates Java code into bytecode

• Converts bytecode into machine code

• Executes machine code directly

Which declaration is invalid in Java?

• int x = 5;

• double rate = 3.5;

• boolean done = "true";

• char grade = 'A';

What data type would be best to store a U.S. dollar amount with cents?

• int

• double

• boolean

• String

What is the output of: System.out.println(3 + 4 * 2);

• 14

• 11

• 7

• 10

What is printed? int x = 5; System.out.println("Value: " + x + 3);

• Value: 8

• Value: 53

• Value: 5+3

• Value: 5 3

Which line updates variable a to be 10 more than its current value?

• a =+ 10;

• a += 10;

• a == a + 10;

• a => 10;

Which Scanner method reads an integer from input?

• next()

• nextLine()

• nextInt()

• readInt()

What is the result of: int x = (int)(7.8); System.out.println(x);

• 7

• 8

• 7.8

• Error

What is the value of x after: int x = 4; x *= 3;

• 7

• 12

• 9

• 4

Which operator increases a variable by 1?

• x += 1;

• x++;

• ++x;

• All of the above