NO.1 Given: What is the result?
A. 7
B. 12
C. 19
D. Compilation
fails
E. An exception is thrown at run time
Answer: B
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NO.2 Given the code fragment:
System.out.printIn ("Result: "
+3+5);
System.out.printIn ("Result: " + (3+5));
What is the result?
A.
Result: 8 Result: 8
B. Result: 35 Result: 8
C. Result: 8 Result: 35
D.
Result: 35 Result: 35
Answer: B
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Explanation:
In
the first statement 3 and 5 are treated as strings and are simply concatenated.
In the first
statement 3 and 5 are treated as integers and their sum is
calculated.
NO.3 View the exhibit:
public class Student {
public
String name = "";
public int age = 0;
public String major =
"Undeclared";
public boolean fulltime = true;
public void display()
{
System.out.println("Name: " + name + " Major: " + major); }
public
boolean isFullTime() {
return fulltime;
}
}
Which line of code
initializes a student instance?
A. Student student1;
B. Student student1 =
Student.new();
C. Student student1 = new Student();
D. Student student1 =
Student();
Answer: C
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NO.4 public class ForTest {
public static void
main(String[] args) {
int[] arrar = {1,2,3};
for ( foo ) {
} }
}
Which three are valid replacements for foo so that the program will
compiled and run?
A. int i: array
B. int i = 0; i < 1; i++
C.
;;
D. ; i < 1; i++
E. ; i < 1;
Answer: A,B,C
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NO.5 Given:
Why will the code not compile?
A. A static field
cannot be private.
B. The getLetter method has no body.
C. There is no
setLetter method.
D. The letter field is uninitialized.
E. It contains a
method named Main instead of ma
Answer: B
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Explanation:
The
getLetter() method needs a body public static int getLetter() { }; .
NO.6
Given:
What is the result?
A. Compilation fails
B. An exception is
thrown at runtime
C. There is no result because this is not correct way to
determine the hash code
D. Hash is: 111111, 44444444, 999999999
Answer:
A
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Explanation:
The compilation fails as SampleClassA and
SampleClassB cannot override SampleClass because the
return type of
SampleClass is int, while the return type of SampleClassA and SampleClassB is
long.
Note: If all three classes had the same return type the output would
be: Hash is : 111111, 44444444,
999999999
NO.7 Given the code
fragment:
Int [] [] array = {{0}, {0, 1}, {0, 2, 4}, {0, 3, 6, 9}, {0, 4, 8,
12, 16}};
Systemout.printIn(array [4] [1]);
System.out.printIn (array) [1]
[4]);
What is the result?
A. 4 Null
B. Null 4
C. An
IllegalArgumentException is thrown at run time
D. 4 An
ArrayIndexOutOfBoundException is thrown at run time
Answer: D
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