Multiple Choice Question

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Submitted by c-admin on Sat, 05/25/2019 - 23:04

QID:

Type:

Multiple Choice Question

Category:

Java Programmer I

Tags:

Java Basic

Question:

Consider the following code appearing in a file named TestClass.java:

class Test{ }  // 1
public class TestClass {
   public int main(String[] args)  { // 2
       double x=10, double y;  // 3
       System.out.println[]; // 4
       
        for(int k =0; k&lt;x; k++){ } 
        
       return 0;
   }
}

Which of the lines are invalid?

Select 1 option

A. // 1 and // 4
B. // 3 and // 4
C. // 2 and // 4
D. // 2 and // 3

Answer and Explanation (Click to expand)

Answer:

Explanation:

// 1 is valid because it is a valid code that declares a class.

// 2 is a valid declaration of a method named main. Although, it is not a correct declaration for the standard main method that can be used to execute the class, but it is a valid method nevertheless.

// 3 is invalid syntax. It can be written as either double x=10; double y; or double x=10, y;
Note that even though x is a double and 10 is an int, it is valid because 10 will automatically be converted to a double. The reverse would not be valid i.e. int x = 10.0; will be invalid.
You need a cast for that: int x = (int) 10.0;

//4 is invalid because println is not a class name. So you cannot create an array of it. println is a method. So it should be written as System.out.println();

//5 is a valid declaration of a for loop.

Q&A Set:

Set 1

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