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Q1. Given the code fragment
int var1 = -5;
int var2 = var1--;
int var3 = 0;
if (var2 < 0) {
var3 = var2++;
} else {
var3 = --var2;
}
System.out.println(var3);
What is the result?
A. – 6
B. – 4
C. – 5
D. 5
E. 4
F. Compilation fails
Answer: C
Q2. Given the code in a file Traveler.java:
And the commands:
Javac Traveler.java
Java Traveler Java Duke What is the result?
A. Happy Journey! Duke
B. Happy Journey! Java
C. An exception is thrown at runtime
D. The program fails to execute due to a runtime error
Answer: D
Q3. Given:
What is the output?
A. 1Z0
B. 1Z0-808
C. An exception will be thrown.
D. Compilation fails due to error at line 3.
E. Compilation tails due to error at line 4.
Answer: E
Explanation:
Option E is the correct answer. Code fails to compile because there is no method called concert in StringBuilder class. The concert method is in String class. Hence option E is correct Here we should have used append method of StringBuilder class, in that case option B would be correct. https://docs.oracle.com/javase/tutorial/java/data/buffers.html
Q4. boolean log3 = ( 5.0 != 6.0) && ( 4 != 5);
boolean log4 = (4 != 4) || (4 == 4);
System.out.println("log3:"+ log3 + nlog4" + log4);
What is the result?
A. log3:false log4:true
B. log3:true log4:true
C. log3:true log4:false
D. log3:false log4:false
Answer: B
Q5. Given:
class Mid {
public int findMid(int n1, int n2) {
return (n1 + n2) / 2;
}
}
public class Calc extends Mid {
public static void main(String[] args) {
int n1 = 22, n2 = 2;
// insert code here
System.out.print(n3);
}
}
Which two code fragments, when inserted at // insert code here, enable the code to compile and print 12?
A. Calc c = new Calc(); int n3 = c.findMid(n1,n2);
B. int n3 = super.findMid(n1,n3);
C. Calc c = new Mid(); int n3 = c.findMid(n1, n2);
D. Mid m1 = new Calc(); int n3 = m1.findMid(n1, n2);
E. int n3 = Calc.findMid(n1, n2);
Answer: A,D
Explanation:
Incorrect:
Not B: circular definition of n3.
Not C: Compilation error. line Calc c = new Mid();
required: Calc
found: Mid
Not E: Compilation error. line int n3 = Calc.findMid(n1, n2);
non-static method findMid(int,int) cannot be referenced from a static context
Q6. Given:
How many objects have been created when the line / / do complex stuff is reached?
A. Two
B. Three
C. Four
D. Six
Answer: C
Q7. You are asked to develop a program for a shopping application, and you are given the following information:
. The application must contain the classes Toy, EduToy, and consToy. The Toy class is the superclass of the other two classes.
. The int caicuiatePrice (Toy t) method calculates the price of a toy.
. The void printToy (Toy t) method prints the details of a toy.
Which definition of the Toy class adds a valid layer of abstraction to the class hierarchy?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: A
Q8. Given:
Which code fragment should you use at line n1 to instantiate the dvd object successfully?
A. Option A
B. Option B
C. Option C
D. Option D
Answer: C
Q9. Given the code fragment:
Which modification enables the code to print 54321?
A. Replace line 6 with System, out. print (--x) ;
B. At line 7, insert x --;
C. Replace line 6 with --x; and, at line 7, insert system, out. print (x);
D. Replace line 12 With return (x > 0) ? false: true;
Answer: B
Q10. Given the code fragment:
What is the result?
A. Found Red
Found Default
B. Found Teal
C. Found Red
Found Blue
Found Teal
D. Found Red
Found Blue
Found Teal
Found Default
E. Found Default
Answer: B