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    Sample Questions:

    QUESTION 1:

    An unchecked exception occurs in a method dosomething()
    Should other code be added in the dosomething() method for it to compile and execute?

    A. The Exception must be caught
    B. The Exception must be declared to be thrown.
    C. The Exception must be caught or declared to be thrown.
    D. No other code needs to be added.

    Answer: D

    Explanation:


    Because the Java programming language does not require methods to catch or to
    specify unchecked exceptions (RuntimeException,Error, and their subclasses), programmers may
    be tempted to write code that throws only unchecked exceptions or to make all their exception
    subclasses inherit fromRuntimeException. Both of these shortcuts allow programmers to write
    code without bothering with compiler errors and without bothering to specify or to catch any
    exceptions. Although this may seem convenient to the programmer, it sidesteps the intent of
    thecatchorspecifyrequirement and can cause problems for others using your classes.

    QUESTION 2:


    Given the code fragment:
    int b = 4;
    b -- ;
    System.out.println (-- b);
    System.out.println(b);
    What is the result?

    A. 2 2
    B. 1 2
    C. 3 2
    D. 3 3

    Answer: A

    Explanation:


    Variable b is set to 4.
    Variable b is decreased to 3.
    Variable b is decreased to 2 and then printed. Output: 2
    Variable b is printed. Output: 2

    QUESTION 3:


    Given the code fragment:
    interface SampleClosable {
    public void close () throws java.io.IOException;
    }
    Which three implementations are valid?

    A. public class Test implements SampleCloseable {
    public void close() throws java.io.IOException {
    / / do something
    }
    }
    B. public class Test implements SampleCloseable {
    public void close() throws Exception {
    / / do something
    }
    }
    C. public class Test implements SampleCloseable {
    public void close() throws java.io.FileNotFoundException {
    / / do something
    }
    }
    D. public class Test extends SampleCloseable {
    public void close() throws java.IO.IOException {
    / / do something
    }
    }
    E. public class Test implements SampleCloseable {
    public void close()
    / / do something
    }
    }

    Answer: A,C,E

    Explanation:

    A: Throwing the same exception is fine.
    C: Using a subclass of java.io.IOException (here java.io.FileNotFoundException) is fine
    E: Not using a throw clause is fine.

    QUESTION 4:


    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]);
    int [] [] array = {{0}, {0, 1}, {0, 2, 4}, {0, 3, 6, 9}, {0, 4, 8, 12, 16}};
    System.out.println(array [4][1]);
    System.out.println(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

    Explanation:


    The first println statement, System.out.println(array [4][1]);, works fine. It selects the
    element/array with index 4, {0, 4, 8, 12, 16}, and from this array it selects the element with index 1,
    4. Output: 4
    The second println statement, System.out.println(array) [1][4]);, fails. It selects the array/element
    with index 1, {0, 1}, and from this array it try to select the element with index 4. This causes an
    exception.
    Output:
    4
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 4

    QUESTION 5:

    Given:
    public class DoCompare1 {
    public static void main(String[] args) {
    String[] table = {"aa", "bb", "cc"};
    for (String ss: table) {
    int ii = 0;
    while (ii < table.length) {
    System.out.println(ss + ", " + ii);
    ii++;
    }
    }
    How many times is 2 printed as a part of the output?

    A. Zero
    B. Once
    C. Twice
    D. Thrice
    E. Compilation fails.

    Answer: D





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