Mid-Year Java Check

Which code segment will print “Hello Karel” to the screen in Java?

• System.out.printLine("Hello Karel");

• print "Hello Karel";

• System.out.println("Hello Karel");

• System.println("Hello Karel");

• system.out.println("Hello Karel");

Answer explanation

System is a class, so it MUST ALWAYS start with an uppercase S.

A String MUST ALWAYS be encapsulated with double quotes [i.e., "This sentence is a string."]

What will this code segment output?

System.out.println("Hello");

System.out.println("World");

• Hello

  World

• HelloWorld

• Hello World

• hello

  World

Answer explanation

The use of the println command forces a carriage return [like hitting the enter key], therefore the words will appear on a different line.

Which of the following is a proper way to declare and initialize a variable in Java?

• myInteger = 100;

• char = 'a';

• int myNumber = 10;

• "Variable"

Answer explanation

To declare a variable, you must first use the name for the variable type, then give the variable a name [for example]:

int age;

declares an integer variable type with the name of age

To store a value [initialize] into it the same time as you declare it would be as follows:

int age = 13;

Which of the below is not a primitive type in Java?

• int

• char

• boolean

• double

• apple

Answer explanation

At best -- the word "Apple" would be a value stored in a String variable.

Which of these input methods is not correct?

• readInt

• readDouble

• readChar

• readBoolean

• readVariable

Answer explanation

All of the other answers would output a question [which you would write] and expect the proper value-type as a response from the user.

What will this code segment output if the user inputs the number 10?

int yourInteger = readInt("Please input a number");

System.out.println(yourInteger);

• yourInteger

• “yourInteger”

• 10

• “10”

Answer explanation

When you declare a variable and ask for userinput, then this is what is stored in that variable. Therefore, when the variable is output, the name of it doesn't appear, but rather the value you stored in it.

What is the result of this expression?

150 % 100

• 0

• 100

• 50

• 
  

  3

Answer explanation

The % is the modulus operator [sometimes called mod]. It results in the REMAINDER of a division as the answer.

Which of the below is NOT a Java arithmetic operator?

• +

• -

• #

• /

Answer explanation

The # sign has no arithmetic effect in Java or any programming language.

What is the name of the programming language that you are learning?

• Java

• Python

• ASP

• C++

In the following statement identify which part is the class:

System.out.println("I Love Java");

• I Love Java

• println

• System

• out

Answer explanation

Class names ALWAYS start with a capital letter and are not surrounded by double quotes.