Ocjp Mock Jgi - III

The code fragment "MyColor treeColor = MyColor.GREEN;" allows the Rainbow class to compile because it creates a new variable "treeColor" of type MyColor and assigns it the value MyColor.GREEN. This is a valid operation as MyColor is an enum and GREEN is one of its defined values.

The output could be 6-1 6-2 5-1 5-2 because the hit() method is synchronized, which means only one thread can access it at a time. However, since there are two threads created in the main method, it is possible for the threads to interleave their execution. Therefore, it is possible for one thread to print "6-1" and "6-2" before the other thread prints "5-1" and "5-2".

Any class in the test package can directly access and change the value of the variable "name". This is because the variable "name" has default access modifier, which means it is accessible within the same package. Therefore, any class within the test package can access and modify the value of the variable "name".

The code fragment "System.out.printf("|%7.3f| ", d);" produces the output "| 12.345|". The "%7.3f" format specifier is used to print a floating-point number with a total width of 7 characters, including the decimal point and any leading spaces. The ".3" precision specifier is used to display 3 digits after the decimal point. Therefore, the output will have a total width of 7 characters, with the number "12.345" centered within it.

The code defines a class hierarchy of Food, Fruit, and Banana, with Banana being the most derived class. The Banana class has an instance variable "yellow" with a value of 4. In the main method, a Banana object "b" is created and serialized using the serializeBanana() method (which is assumed to be correct). Then, another Banana object "b2" is created and deserialized using the deserializeBanana() method (also assumed to be correct). Finally, the yellow, juice, and good instance variables of "b2" are printed. Since "b2" is deserialized from "b", it will have the same values for all the instance variables, resulting in "restore 453" being printed.

Three of the code fragments, "public static void main(String...a)", "public static void main(String... a)", and "public static void main(String...[] a)", can be inserted independently at line 12 and will compile. These fragments define the main method with a variable-length argument parameter, which is a valid syntax in Java.

The output of this code is "42042". The code starts with a string "420" on line 3. On line 4, the "+=" operator is used to concatenate the number 42 to the string, resulting in "42042". Finally, on line 5, the string is printed to the console.

The capability of writing a line separator to an open stream exists only in java.io.FileWriter. This means that FileWriter specifically allows for the writing of a line separator, which is a special character or sequence of characters used to indicate the end of a line in a text file. The other options mentioned, such as closing an open stream, flushing an open stream, and writing to an open stream, are capabilities that are generally available in various I/O classes in Java, not exclusive to FileWriter.

The code "Nav.Direction d = Nav.Direction.NORTH;" allows the Sprite class to compile because it correctly specifies the fully qualified name of the Direction enum. This ensures that the compiler can identify the enum and its values without any ambiguity.

The correct answer is "atom granite atom granite" because when the Mountain class is instantiated, it calls the constructor of the Rock class with the argument "granite". This constructor then prints "granite". Then, a new instance of the Rock class is created with the argument "granite", which also prints "granite". Finally, the constructor of the Mountain class calls the constructor of the Atom class, which prints "atom". Therefore, the output is "atom granite atom granite".

The result is "150, 150, 150" because the speed() method is overridden in each class. When the speed() method is called on the RaceCar object, it returns 150. Similarly, when the speed() method is called on the Car object and the Vehicle object, they both refer to the RaceCar object and return 150 as well. Therefore, the result is 150, 150, 150.

The code snippet is using a do-while loop to decrement the value of y by 1 and increment the value of x by 1 until x is less than 5. Since the initial value of x is 0, the loop will run 5 times (from x = 0 to x = 4). Therefore, the final values of x and y will be 5 and 5 respectively.

The code will fail to compile because the method go() has a parameter of type int (x) after the varargs parameter (y). According to the rules of varargs, the varargs parameter must be the last parameter in the method signature. Therefore, having an int parameter after the varargs parameter is not allowed and will result in a compilation error.

Three of the code fragments, "public static void main(String...a)", "public static void main(String... a)", and "public static void main(String...[] a)", can be inserted independently at line 12 and will compile. These fragments define the main method with the correct syntax, allowing the program to run and print "hi". The other two fragments, "public static void main(String.* a)" and "public static void main(String[]... a)", have incorrect syntax and will not compile.

When line 14 is reached, there are four objects eligible for the garbage collector. The objects eligible for garbage collection are the ones that are no longer referenced by any active variables. In this case, i2 is set to null, meaning it no longer references any object. Additionally, i3 is reassigned to reference the same object as i1, so the previous object it referenced is also no longer referenced. Therefore, i2 and the two previously referenced objects by i3 are eligible for garbage collection.

The code can throw an IllegalMonitorStateException because the obj.wait() and obj.notify() methods can only be called within a synchronized block on the object that is being waited on or notified. In this case, the synchronized block is using Thread.currentThread() as the lock object, so calling obj.wait() and obj.notify() will result in an IllegalMonitorStateException.

A possible location for the Chess.class file is /test/games/Chess.class. This is because the command to run the Java chess program includes the classpath argument "-classpath /test:/home/bob/downloads/*.jar", which means that the program will look for the Chess.class file in the /test directory. Additionally, the package structure of the chess program is specified as "games.Chess", indicating that the Chess.class file should be located in a "games" directory within the classpath. Therefore, /test/games/Chess.class is a possible location for the file.

The result is 82 because the variable "squares" is incremented by 10 inside the "incr" method, which is called in the "go" method. The "++" operator before "squares" in the line "incr(++squares)" increments the value of "squares" before passing it to the "incr" method. Therefore, the original value of 81 is incremented by 10 to become 91, and then it is printed in the line "System.out.println(squares)" in the "go" method.

The go() method contains nested for loops. The outer loop iterates from 0 to 2, while the inner loop iterates from 0 to 1.

At line 27, if x equals 1, the inner loop is terminated using the "break" statement. This means that when x is 1, the inner loop will not execute and move to the next iteration of the outer loop.

At line 28, if x equals 2 and y equals 1, the outer loop is terminated using the "break z" statement. This means that when x is 2 and y is 1, both the inner and outer loops will be terminated.

The variable "o" stores the concatenation of x and y at each iteration of the inner loop. Therefore, the final value of "o" will be "000120".

Hence, the result when the go() method is invoked is "000120".

The finalize() method for a given object is called no more than once by the garbage collector. This means that even if the garbage collector runs multiple times, the finalize() method will only be called once for a specific object.

The code fragment "sb1.append("abc"); s1 = s1.concat("abc");" is the correct answer because it appends "abc" to the StringBuilder object sb1 using the append() method and concatenates "abc" to the String object s1 using the concat() method. This ensures that both sb1 and s1 have "abc" added to their original values, resulting in the desired output "123abc 123abc".

If an exception is thrown at line 34, the catch block at line 35 will catch the exception since it is specifically catching NullPointerException. It will then print "a". After the catch block, the finally block at line 40 will always execute and print "c". Therefore, the possible output in this scenario is "ac".

The code creates an anonymous inner class that implements the TestA interface and overrides the toString() method to return "test". The anonymous inner class is then instantiated and its toString() method is called when printing to the console. Therefore, the result is "test".

Changing line 13 to either "public Sub() { this(5); }" or "public Sub() { super(5); }" will allow the Sub class to compile. In the first case, "this(5);" calls the constructor of the Sub class with the argument 5. In the second case, "super(5);" calls the constructor of the Super class with the argument 5. Both of these changes ensure that the Sub class has a valid constructor that can be used to create objects.

The code "Foo f = (Delta)x;" will cause a java.lang.ClassCastException. This is because the object "x" is of type Beta, and cannot be casted to type Delta, which is a subclass of Beta.

The equals method does not properly override the Object.equals method because it takes a parameter of type Person instead of Object. In order to properly override the equals method, it should have the signature "public boolean equals(Object obj)".

Line 12 is attempting to cast the object "build1" of type Building to a String. Since Building is not a subclass of String, this cast is not valid and will result in a compilation error. Therefore, if line 12 is removed, the compilation will succeed.

The given code will result in a compilation error. This is because the "finally" block is placed after the "if-else" statements, which is not allowed in Java. The "finally" block should always come after the "try" and "catch" blocks. Therefore, the code will not compile and an error will occur.

The correct answer is 18. try {
19. d = df.parse(ds);
20. } catch(ParseException e) { };

This code block tries to parse the string representation of a date, "December 15, 2004", using the DateFormat object df. If the parsing is successful, the value of d will be updated to the date represented by ds. If there is a ParseException, the catch block will handle the exception.

The code in the main method of the Yippee class is using a for loop to iterate over the elements in the args array, starting from index 1. However, since the length of the args array is 0 in the first command line invocation (java Yippee), the loop condition (x

The correct answer is "class Man { private Dog bestFriend; }". This answer properly represents the relationship "Man has a best friend who is a Dog" by declaring a private instance variable "bestFriend" of type Dog within the Man class. This allows each instance of the Man class to have a specific Dog object as their best friend.

The code creates a new thread and starts it. In the run() method of the Threads2 class, it prints "run." and then throws a RuntimeException with the message "Problem".

Since the new thread is started, it will execute concurrently with the main thread. So, the order of the output is not guaranteed.

The possible results are:

1. End of method. (printed by the main thread)
2. run. (printed by the new thread)
3. java.lang.RuntimeException: Problem (thrown by the new thread)

Therefore, the correct answers are:
- End of method.
- run.
- java.lang.RuntimeException: Problem

The code in GrizzlyBear.java needs to import the Salmon class from the fish package in order to use the findSalmon() method. Therefore, adding "import animals.fish.*;" at line 2 in GrizzlyBear.java allows the code to compile correctly.

The code "b = nf.format( input );" sets the value of b to 314.159,26. This is because the format() method of the NumberFormat class formats the given number according to the specific locale, in this case, the Italian locale. The formatted number is then assigned to the variable b.

The code creates a new directory named "dir" and a new file named "f1.txt" inside that directory. Then, it renames the "dir" directory to "newDir". Therefore, the file system has a directory named "newDir", containing a file "f1.txt".

The correct answer is "import static utils.Repetition.twice;". This is because the method "twice" is a static method in the class "Repetition", and in order to directly access the method without specifying the class name, we need to use the "import static" statement.

When the class Donkey is invoked for the first time without assertions enabled, the code on line 4 does not execute because the condition (assertsOn) is false. Therefore, the if statement on line 5 is not executed, and there is no output.

When the class Donkey is invoked for the second time with assertions enabled, the code on line 4 executes because the condition (assertsOn) is true. This causes the value of assertsOn to be set to true. Therefore, the if statement on line 5 is executed, and the message "assert is on" is printed as output.

The correct method to complete the class is "public int compareTo(Score other){/*more code here*/}". This is because the class implements the Comparable interface, which requires the implementation of the compareTo method. The compareTo method is used to compare two objects of the same class and determine their order. In this case, the compareTo method will compare two Score objects based on their wins and losses, allowing for sorting or ordering of Score objects based on their performance.

The given command line invocation "javac -d classes source/Utils.java" compiles the Utils.java file in the source directory and specifies the output directory as classes using the -d flag. Therefore, if the compilation is successful, the resulting Utils.class file will be added to the classes directory.

The compilation fails because the variable "f" is declared inside the try block and is not accessible outside of it. Therefore, when trying to print the value of "f" in the finally block, a compilation error occurs.

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The code executes normally and prints "sleep" because the main method is the entry point of the program and it is executed sequentially. The Thread.sleep(3000) method pauses the execution of the program for 3000 milliseconds (3 seconds), allowing the "sleep" message to be printed after the pause.

The correct answer is "Compilation fails due to an error on line 26." This is because the method getC() in the Yen class is trying to access the private variable "country" from the superclass Money using the "super" keyword. However, since "country" is a private variable, it is not accessible from the subclass Yen, resulting in a compilation error.

The result is "2 3" because the first if statement on line 17 evaluates to false since x is not equal to 4 and b2 is false. Therefore, the code inside the if statement is not executed. The second if statement on line 20 evaluates to true since b2 is assigned the value true and b1 is true. Therefore, the code inside the if statement is executed and "3" is printed. Finally, the program reaches the end of the main method and terminates, resulting in the output "2 3".

The first statement is true because deadlock can occur when multiple threads are waiting for resources that are held by other threads, resulting in a circular dependency. Therefore, it is possible for more than two threads to deadlock at once.

The last statement is also true because invoking Thread.yield() only gives a hint to the scheduler that the current thread is willing to yield its current use of the processor. It does not guarantee that deadlock will be eliminated if the code is already capable of deadlocking.

The code creates a new Thread object "t" and passes an instance of the Threads3 class as the target for the thread. The run() method of the Threads3 class prints "running".

In line 7 and 8, t.run() is called twice, which simply executes the run() method in the current thread, without starting a new thread. So, "running" is printed twice.

In line 9, t.start() is called, which starts a new thread and invokes the run() method in that new thread. So, "running" is printed for the third time.

Therefore, the code executes and prints "runningrunningrunning".

The first statement is true because the hashCode method can be used to check if two objects are not equal. The second statement is true because the hashCode method is used by the java.util.HashSet collection class to group elements into hash buckets for efficient retrieval.

The line 29 is attempting to sort the array "myObjects" using the Arrays.sort() method. However, the array contains objects of different types (Integer, String, and Boolean), which cannot be directly compared. This results in a ClassCastException, as the sort method cannot determine the correct order of the objects.

The given code initializes an array of strings called "elements" with three values. Then, it declares a string variable "first" and assigns the value of the first element of the "elements" array to it using the ternary operator. Since the length of the "elements" array is greater than 0, the condition of the ternary operator is true and the value of the first element is assigned to "first". Therefore, the variable "first" is set to elements[0].

The first class uses the Shape class correctly because it extends the Shape class and implements the abstract methods. The second class also uses the Shape class correctly because it extends the Shape class and provides an implementation for the draw() method.