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Question 1:
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);
Correct Answer: AD
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
Question 2:
Given: What is the result?
A. 100
B. Compilation fails due to an error in line n1
C. Compilation fails due to an error at line n2
D. Compilation fails due to an error at line n3
Correct Answer: C
Question 3:
Given the following code:
What are the values of each element in intArr after this code has executed?
A. 15, 60, 45, 90, 75
B. 15, 90, 45, 90, 75
C. 15, 30, 75, 60, 90 D. 15, 30, 90, 60, 90
E. 15, 4, 45, 60, 90
Correct Answer: C
Question 4:
Given: Which constructor initializes the variable x3?
A. Only the default constructor of class X
B. Only the no-argument constructor of class Y
C. Only the no-argument constructor of class Z
D. Only the default constructor of object class
Correct Answer: C
Question 5:
Which usage represents a valid way of compiling java source file with the name “Main”?
A. javac Main.java
B. java Main.class
C. java Main.java
D. javac Main
E. java Main
Correct Answer: A
Explanation: The compiler is invoked by the javac command. When compiling a Java class, you must include the file name, which houses the main classes including the Java extension. So to run Main.java file we have to use command in option A. TO execute Java program we can use Java command but can\’t use it for compiling. https://docs.oracle.com/javase/tutorial/getStarted/application/index.html
Question 6:
Given: What is the result?
A. myStr: 9009, myNum: 9009
B. myStr: 7007, myNum: 7007
C. myStr: 7007, myNum: 9009
D. Compilation fails
Correct Answer: C
Question 7:
Given the following class:
Which three pieces of code, when inserted independently, set the value of amount to 100?
A. B. C. D. E. F.
Correct Answer: ADE
Question 8:
Given:
class Base {
// insert code here
}
public class Derived extends Base{
public static void main(String[] args) {
Derived obj = new Derived();
obj.setNum(3);
System.out.println(“Square = ” + obj.getNum() * obj.getNum());
}
}
Which two options, when inserted independently inside class Base, ensure that the class is being properly
encapsulated and allow the program to execute and print the square of the number?
A. private int num; public int getNum() { return num; }public void setNum(int num) { this.num = num;}
B. public int num; protected public int getNum() { return num; }protected public void setNum(int num) { this.num = num;}
C. private int num;public int getNum() {return num;} private void setNum(int num) { this.num = num;}
D. protected int num; public int getNum() { return num; } public void setNum(int num) { this.num = num;}
E. protected int num; private int getNum() { return num; } public void setNum(int num) { this.num = num;}
Correct Answer: AD
Incorrect:
Not B: illegal combination of modifiers: protected and public not C: setNum method cannot be private.
not E: getNum method cannot be private.
Question 9:
Given the code fragment:
What is the result?
A. 2 : 7 : 3
B. 7 : 7 : 9
C. 2 : 7 : 0
D. 7 : 2 : 3
Correct Answer: D
Question 10:
Given the code fragment:
What is the result?
A. 2 4
B. 0 2 4 6
C. 0 2 4
D. Compilation fails
Correct Answer: C
Question 11:
Given the code fragment:
Which two code fragments can be independently inserted at line n1 to enable the code to print the elements of the array in reverse order? (Choose two.)
A. B.
C. D. E.
Correct Answer: AE