platformoreo.blogg.se - String instruments quiz

STRING INSTRUMENTS QUIZ CODE

static factory method singleton strategy pattern.Some examples are the _, which helps create instances of a class, the _, which ensures that only one instance of a class can be created and the _, which allows for a group of algorithms to be interchangeable. Java programmers commonly use design patterns. There is no way to force an object to be garbage collected.Set object to null and call Runtime.getRuntime().runFinalization().Set object to null and call System.gc().Set object to null and call Runtime.gc().How do you force an object to be garbage collected?

What kind of relationship does "extends" denote? moving objects from a List to a HashMap.enabling HashMap to find matches faster.deciding if two instances of a class are equal.What is a valid use of the hashCode() method? Which functional interfaces does Java provide to serve as data types for lambda expressions? groucyButton.addActionListener(() -> ("Press me one more time.")).addActionListener( new ActionListener() Override public void actionPerformed( ActionEvent e) ) Refactor this event handler to a lambda expression: How would you declare and initialize an array of 10 ints? The internal state of the parent class is accessible to its children.

Classes related by inheritance are tightly coupled to each other.Responsibilities are not evenly distributed between parent and child classes.Overridden methods of the parent class cannot be reused.Which choice is a disadvantage of inheritance? Which operator would you use to find the remainder after division? It will not compile because the second catch statement is unreachableĮxplanation: native is a part of JNI interface.Declare a variable that holds the first four digits of Π You don't have to decide the type of an ArrayList when you first make it.ArrayLists can hold more kinds of objects than arrays.You can put more items into an ArrayList than into an array.You don't have to decide the size of an ArrayList when you first make it.Put the static members in an interface and inherit from that interface.You must always qualify references to static members with the class form which they came from. Declare local copies of the constant in your code.What would be the best way to allow you to use simply "PI" in your code? Normally, to access a static member of a class such as Math.PI, you would need to specify the class "Math".

STRING INSTRUMENTS QUIZ CODE

How many times will this code print "Hello World!"? Fill in the blank to create a piece of code that will tell whether int0 is divisible by 5:

new SimpleDateFormat("yyyy-MM-dd").format(new Date())Įxplanation: LocalDate is the newest class added in java 8 Q20.

Which is the most up-to-date way to instantiate the current date? By implementing encapsulation, you cannot directly access the class's _ properties unless you are writing code inside the class itself.

names.stream().sorted((s1, s2) -> s1.compareTo(s2)).collect(Collectors.toList()).

You have an ArrayList of names that you want to sort alphabetically. Reasoning: i2 & b1 is not allowed between int and boolean. Given the following definitions, which of these expression will NOT evaluate to true?īoolean b1 = true, b2 = false int i1 = 1, i2 = 2 How can you achieve runtime polymorphism in Java?

You can also take the ending index and subtract the beginning index from it, to determine how many chars will be included in the substring (5-2=3).

Therefore, the method will return "raw" as those are the chars in indexes 2,3, and 4.

Strings in Java are like arrays of chars.

and the second the index of the string to end the substring(excludes the char at 5).

The first argument being the index to start(includes that char at 2).

Reasoning: The substring method is accepting two arguments. Given the string "strawberries" saved in a variable called fruit, what would fruit.substring(2, 5) return? In fact, before the advent of the violin and the cello, historical civilizations in ancient China, India, Egypt, and Greece, were all plucking away at stringed instruments!Īll of this should not come as a surprise to anyone since it has been evident that music is, without a doubt, the universal language.Java Q1. Stringed instruments were not just limited to Europe. However, while these may be the types of stringed instruments that are at the forefront of pop culture today, that list hasn't even scratched the surface of what the history of stringed instruments has to offer. Nowadays, when the term "stringed instrument" is uttered, most people initially think of acoustic guitars, violins, cellos, and electric guitars. A simple piece of string tied to a simple stick that was all it took for stringed instruments to be born.