Java MULTIPLE CHOICE. Choose the one alternative that best completes the stateme

Question

Java

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question

1) Which of the following statement prints smithexam1 est.txt? 1) A) System.out.println("smith"exam1" est.txt"); B) System.out.println("smithexam1 est.txt"); C) System.out.println("smith\exam1\test.txt"); D) System.out.println("smith"exam1"test.txt");
2) An int variable can hold ________. (Choose all that apply.) 2) A) 120 B) 120.0 C) "x" D) "120" E) 'x'
3) Suppose x is 1. What is x after x-= 1? 3) A) 0 B) 1 C) 2 D) -1 E) -2
4) What is y displayed in the following code?
public class Test { public static void main(String[ ] args) { int x= 1; int y= x+++ x; System.out.println("y is "+ y); } }
4)
A) y is 1. B) y is 4. C) y is 2. D) y is 3.
5) According to Java naming convention, which of the following names can be variables? (Choose all that apply.)
5)
A) findArea B) TOTAL_LENGTH C) FindArea D) totalLength E) class
1
6) What is y displayed in the following code?
public class Test1 { public static void main(String[ ] args) { int x= 1; int y= x= x + 1; System.out.println("y is "+ y); } }
6)
A) y is 2 because x + 1 is assigned to x and then x is assigned to y. B) y is 1 because x is assigned to y first. C) y is 0. D) The program has a compile error since x is redeclared in the statement int y= x = x+ 1.
7) What is the printout of System.out.println('z'- 'a')? 7) A) z B) a C) 25 D) 26

Explanation / Answer

4th Question :

4) What is y displayed in the following code?
public class Test { public static void main(String[ ] args) { int x= 1; int y= x+++ x; System.out.println("y is "+ y); } }
4)
A) y is 1. B) y is 4. C) y is 2. D) y is 3.

Answer :

D) y is 3.

Description :

The location of the shortcut operator is only important if the operator is used in an expression where the operand value is assigned to another variable or returned from a method.

Operator Use   description

++ x++ y = x++; is the same as y = x; x = x + 1;   

++x y = ++x; is the same as x = x + 1; y = x;

6) What is y displayed in the following code?
public class Test1 { public static void main(String[ ] args) { int x= 1; int y= x= x + 1; System.out.println("y is "+ y); } }

Answer : y is 2

Description : In first step : value of x is 1,

second step : added 1 in x and assigned to value in y then print out value of y.

1) Which of the following statement prints smithexam1 est.txt? 1) A) System.out.println("smith"exam1" est.txt"); B) System.out.println("smithexam1 est.txt"); C) System.out.println("smith\exam1\test.txt"); D) System.out.println("smith"exam1"test.txt");

Answer : System.out.println("smith\exam1\test.txt");

Description : the backslashes are doubled due to being in Java string literals - so the actual strings involved here are "single backslash" and "double backslash" - not double and quadruple.

7) What is the printout of System.out.println('z'- 'a')? 7) A) z B) a C) 25 D) 26

Answer : C) 25

In above code : Decimal value of z char is : 90 and  Decimal value of a char is 65

System.out.println(90 - 65) : 25

In java, some decimal value of all char like as a to z.

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