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Questions and Answers
What will be the output of the code: String a = "lorem"; int b = 8; System.out.println(a + b);?
What will be the output of the code: String a = "lorem"; int b = 8; System.out.println(a + b);?
- lorem8 (correct)
- 8lorem
- Will throw an exception
- Compilation error
Which statement accurately describes Java?
Which statement accurately describes Java?
- An OOP language (correct)
- Both OOP and procedural language
- An interpreted language
- A procedural language
What exception is thrown when accessing index 5 on an array with a length of 5?
What exception is thrown when accessing index 5 on an array with a length of 5?
- OutOfRangeException
- No exception is thrown
- OutOfMemoryException
- IndexOutOfBoundsException (correct)
To which of the following can the modulus operator (%) be applied?
To which of the following can the modulus operator (%) be applied?
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What is the most suitable option to replace the blank in the following code? if (score < 5) { return "Fail"; } else if (______) { return "Pass"; }
What is the most suitable option to replace the blank in the following code? if (score < 5) { return "Fail"; } else if (______) { return "Pass"; }
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Study Notes
Output of String and Integer Concatenation
- The code results in the output
lorem8. This happens because Java automatically concatenates strings when different data types interact, treating the integerbas a string.
Java Language Characteristics
- Java is both an object-oriented programming (OOP) language and a procedural language. This means it supports both object-oriented concepts like encapsulation, inheritance, and polymorphism, as well as procedural programming approaches with sequential instructions.
Array Index Out-of-Bounds Exception
- Accessing an array element with an index outside the valid range (0 to length - 1) throws an
IndexOutOfBoundsException. - In this case, trying to access index 5 in an array of length 5 will result in an
IndexOutOfBoundsException.
Modulus Operator Application
- The modulus operator (%) can be applied to both integers and floating-point numbers.
- This operator returns the remainder after division.
Completing the if-else Condition
- The most suitable option to fill the blank is
score >= 5. This creates a complete conditional statement: if the score is less than 5, return "Fail"; otherwise, if the score is greater than or equal to 5, return "Pass."
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