What are wrapper classes and why are they useful for ArrayLists? Include examples of autoboxing and unboxing. Word count: More than 300 words and less than 700 words
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Q: What are wrapper classes and why are they useful for ArrayLists? In your answer, include examples of…
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Q: hat is the best way to remove duplicates from an ArrayList?
A: What is the best way to remove duplicates from an ArrayList?
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Q: Write a declaration of a local variable called cs101 that can hold an ArrayList of Student.
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What are wrapper classes and why are they useful for ArrayLists?
Include examples of autoboxing and unboxing.
Word count: More than 300 words and less than 700 words.
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- What are wrapper classes and why are they useful for ArrayLists? Include examples of autoboxing and unboxing.What are wrapper classes and why are they useful for ArrayLists? Include examples of autoboxing and unboxing. Word count: More than 300 and Less than 700 wodsImport the ArrayList and List classes from the java.util package to create a list of phone numbers and also import the HashSet and Set classes from the java.util package to create a set of unique prefixes. Create a class called PhoneNumberPrefix with a main method that will contain the code to find the unique prefixes. Create a List called phoneNumbers and use the add method to add several phone numbers to the list. List<String> phoneNumbers = new ArrayList<>(); phoneNumbers.add("555-555-1234"); phoneNumbers.add("555-555-2345"); phoneNumbers.add("555-555-3456"); phoneNumbers.add("444-444-1234"); phoneNumbers.add("333-333-1234"); Create a Set called prefixes and use a for-each loop to iterate over the phoneNumbers list. For each phone number, we use the substring method to extract the first 7 characters, which represent the prefix, and add it to the prefixes set using the add method. Finally, use the println method to print the prefixes set, which will contain all of…
- What is an annotation? How are annotations useful in writing our ArrayList<E> class?Are they equivalent? 1) ArrayList<?> list = new ArrayList(); 2) ArrayList<? extends Object> list = new ArrayList<>();What are the distinctions between an ArrayList and a Vector?Which collection class is best for data manipulation?
- Write assignments to the library, cs101, and track variables (which you defined in the previous three exercises) to create the appropriate ArrayList objects. Write them once using diamond notation and once without diamond notation, specifying the full type.Use the Iterator Pattern: Create a class called Exercise, and then, in its main method, create an ArrayList called stringArrayList. Add the following five strings to stringArrayList: “one”, “two”, ”three”, ”four”, ”five”. Then, use a for loop and the index of stringArrayList to print all these five strings out to the console. 2. For stringArrayList above, can you use an iterator to traverse the five strings inside, without using the index? 3. If change stringArrayList into a TreeSet, how do you traverse the five strings use an iterator? Implement an Iterator: 4. Create a class called StringArray that is able to store a number of String objects. Create an instance variable, String[] values, (internal data storage) of StringArray to store all the strings. 5. Create a constructor for StringArray, which is able to build an object of StringArray using the parameter. public StringArray(String[] values) 6. Make the class StringArray implements Iterable So that it…What are the differences between ArrayList and Vector? Which collection class is good for manipulatingdata?
- This is needed in Java Given an existing ArrayList named friendList, find the first index of a friend named Sasha and store it in a new variable named index.What are the two ways to remove duplicates from ArrayList?Using JAVA, write a method that modifies an ArrayList<String>, moving all strings starting with an uppercase letter to the front, without otherwise changing the order of the elements. Write a test program to demonstrate the correct operation of the method.