Java CIS 109 Test 1
You will be tested on java constructs such as loops, if conditions, methods etc
Questions and Answers
- 1.
Which is the correct boolean expression which gives the following meaning:The value of x is greater than 1000 and x is smaller or equal to 2000
- A.
X >= 1000 && x
- B.
X > 1000 && x < 2000
- C.
X < 1000 && x >= 2000
- D.
X > 1000 && x
- E.
None of the above
Correct Answer
D. X > 1000 && xExplanation
The correct boolean expression is "x > 1000 && xRate this question:
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- 2.
Will this compile?class A{ System.out.println(20 * 10);}
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
No it won't because such a statement should be within some method, e.g. the main method.Rate this question:
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- 3.
Will this compile?class B{ public static void main(String[] args) { Scanner sc = new Scanner(System.in); }}
- A.
Yes
- B.
No
Correct Answer
B. NoExplanation
No, because you need to import java.util.ScannerRate this question:
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- 4.
What will this output?System.out.println(5/2);
- A.
2
- B.
2.5
- C.
Some kind of error
- D.
3
Correct Answer
A. 2Explanation
Since you are dividing two integers, the result is also an integer. It simply doesn't output the decimal part of the result. If you wanted to show a decimal number, one of them needs to be a double. E.g. 3/2.0Rate this question:
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- 5.
What will this output?int i = 10;int j = 20;System.out.println("The result of "+j+" division by 2 is "+i+".");
- A.
The result of j division by 2 is i.
- B.
The result of 20 division by 2 is 10.
- C.
The result of10 division by 2 is 20.
- D.
None of the above
Correct Answer
B. The result of 20 division by 2 is 10.Explanation
The given code will output "The result of 20 division by 2 is 10." This is because the code is using the variables `i` and `j` in the `System.out.println()` statement. The value of `j` is 20 and the value of `i` is 10. So when the code is executed, it will print the string "The result of 20 division by 2 is 10."Rate this question:
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- 6.
What will this output?System.out.println(4 + 5 * 2);
- A.
14
- B.
18
- C.
None of the above
Correct Answer
A. 14Explanation
The * operator has a higher precedence than the plus operatorRate this question:
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- 7.
Rewrite this as a for loopint i = 0;while (i < 10){ System.out.println(i); i++;}
- 8.
Will the following compile?int i = 0;for ( ; i < 5 ; ){ System.out.println(i); i++;}
- A.
Yes
- B.
No
Correct Answer
A. YesExplanation
The for loops consists of
for (; ; )
All of these are optional and you can leave any of them out. Try experimenting it on BlueJ.Rate this question:
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- 9.
What is the return types of the following body of a method{ int i = 10; return 3 * i;}
- A.
Int
- B.
Long
- C.
Double
- D.
30
- E.
None of the above
Correct Answer
A. IntExplanation
The return type of the given method body is "int" because the method is declared to return an integer value. The body of the method initializes an integer variable "i" with a value of 10 and then returns the result of multiplying 3 with "i", which is an integer value. Therefore, the correct answer is "int".Rate this question:
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- 10.
What is the return types of the following body of a method { double d = 10; return 3 * d; }
- A.
Int
- B.
Long
- C.
Double
- D.
30.0
- E.
None of the above
Correct Answer
C. DoubleExplanation
The return type of the given method is "double" because the method is declared to return a value of type "double" and the expression "3 * d" evaluates to a double value.Rate this question:
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- 11.
What is the return types of the following body of a method { return "test "+123; }
- A.
Int
- B.
Char
- C.
String
- D.
Test123
- E.
Will not compile
Correct Answer
C. StringExplanation
The return type of the given method is String because the body of the method is returning a string value "test "+123. The return statement is used to return a value from a method, and in this case, the value being returned is a string.Rate this question:
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- 12.
What will the following output on the screen?for (int i = 0; i < 5; i++){ System.out.print("*");}
- A.
* * * * *
- B.
*****
- C.
******
- D.
* * * * * *
- E.
None of the above
Correct Answer
B. *****Explanation
It will only output 5 stars one after the other on the same line, because print is being used and not println. The counter i starts from 0, then it will execute the body of the for loop while i is less than 5. It would have output 6 stars if it was iRate this question:
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- 13.
Write a program that will ask the user to start entering numbers. When he enters the number 0, you will show to him the sum of all the numbers he has entered.
- 14.
What will be the output of the following programclass A{ public static void main(String[] args) { System.out.println(getWelcomeMessage()); } static String getWelcomeMessage() { return "Welcome!!!"; }}
- A.
GetWelcomeMessage()
- B.
GetWelcomeMessage
- C.
Welcome!!!
- D.
It would give a compilation error
Correct Answer
C. Welcome!!!Explanation
The program will output "Welcome!!!" because the main method calls the getWelcomeMessage() method, which returns the string "Welcome!!!" and then prints it using the System.out.println() method.Rate this question:
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Mar 18, 2023Quiz Edited by
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Nov 13, 2008Quiz Created by
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