Oracle Java Programming Certification Questions and Answers (Dumps and Practice Questions)

Question : You have been given following code

class StaticField {
static int i = 7;

public static void main(String[] args) {
StaticField obj = new StaticField();
obj.i++;
StaticField.i++;
obj.i++;
System.out.println(StaticField.i + " " + obj.i);
}
}

what would be printed ?



1. 10 10
2. 8 9
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4. 7 10



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Explanation:









Question : Which declaration initializes a boolean variable?


1. boolean h = 1;
2. boolean k = 0;
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4. boolean j = (1 < 5);



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Explanation: The primitive type boolean has only two possible values: true and false. Here j is set to (1 <5), which evaluates to true







Question : Which two are Java Exception classes?
A. SercurityException
B. DuplicatePathException
C. IllegalArgumentException
D. TooManyArgumentsException


1. A,B
2. B,C
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4. A,D
5. A,C



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Related Questions

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Question : Which three statements are benefits of encapsulation?
A. Allows a class implementation to change without changing t he clients
B. Protects confidential data from leaking out of the objects
C. Prevents code from causing exceptions
D. Enables the class implementation to protect its invariants
E. Permits classes to be combined into the same package
F. Enables multiple instances of the same class to be created safely

1. A,B,C
2. B,C,D
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4. D,E,F

5. A,B,D



Question : Which statement will empty the contents of a StringBuilder variable named sb?


1. sb.deleteAll();
2. sb.delete(0, sb.size());
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4. sb.removeAll();




Question : Given the code fragment:
System.out.println(2 + 4 * 9 - 3); //Line 21
System.out.println((2 + 4) * 9 - 3); // Line 22
System.out.println(2 + (4 * 9) - 3); // Line 23
System.out.println(2 + 4 * (9 - 3)); // Line 24
System.out.println((2 + 4 * 9) - 3); // Line 25
Which line of codes prints the highest number?

1. Line 21
2. Line 22
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4. Line 24

4. Line 25





Question : Given the for loop construct:

for ( expr1 ; expr2 ; expr3 ) {
statement;
}

Which two statements are true?
A. This is not the only valid for loop construct; there exits another form of for loop constructor.
B. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
C. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
D. The expression expr3 must be present. It is evaluated after each iteration through the loop


1. A,B
2. B,C
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4. A,D
5. A,C





Question : You have been given following code

class Overloading {
int x(double d) {
System.out.println("one");
return 0;
}

String x(double d) {
System.out.println("two");
return null;
}

double x(double d) {
System.out.println("three");
return 0.0;
}

public static void main(String[] args) {
new Overloading().x(4.0);
}
}

What is the result?


1. One
2. Two
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4. Compilation fails






Question : :You have been given following code

public class Test {
public static void main(String[] args) {
try {
String[] arr = new String[4];
arr[1] = "Unix";
arr[2] = "Linux";
arr[3] = "Solarios";
for (String var : arr) {
System.out.print(var + " ");
}
} catch (Exception e) {
System.out.print(e.getClass());
}
}
}

What is the result?


1. Unix Linux Solaris
2. Null Unix Linux Solaris
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4. Class java.lang.NullPointerException