![]() Note that the returned type for asList() is a List using a concrete ArrayList implementation, but it is NOT. List l2 = Collections.unmodifiableList(Arrays.asList("element1", "element2")) Use the JDK's Arrays class and its asList() factory method, wrapped with a Collections.unmodifiableList(): List l1 = Collections.unmodifiableList(Arrays.asList(anArrayOfElements)) You do in one Guava call what takes 2 with the current Java Collections. However, this argument holds less water since Java 7 arrived with the new diamond operator.īut it's not the only reason (and Java 7 isn't everywhere yet): the shorthand syntax is also very handy, and the methods initializers, as seen above, allow to write more expressive code. The main attraction could be to reduce the clutter due to generics for type-safety, as the use of the Guava factory methods allow the types to be inferred most of the time. Please also note the similar methods for other data structures in other classes, for instance in Sets. List l3 = Lists.newArrayList("or", "string", "elements") // from varargs List l2 = Lists.newArrayList(aStringArray) // from array Use the Lists class and its newArrayList() factory methods: List l1 = Lists.newArrayList(anotherListOrCollection) // from collection List il = pyOf(aStringArray) // from array Use the ImmutableList class and its of() and copyOf() factory methods (elements can't be null): List il = ImmutableList.of("string", "elements") // from varargs It's worth pointing out the Guava way, which greatly simplifies these shenanigans: Usage For an Immutable List ( product.pid+" "+ " " +product.pname+" "+" "+product.pavailability+" "+product.pprice+ " "+String.format("%.01f", product.(old thread, but just 2 cents as none mention Guava or other libs and some other details) If You Can, Use Guava invoking the get() method of the ArrayList class to get the elements iteration over the ArrayList for accessing the elements ("Product ID" + " Product Name" + " Product Availability" + " Product Price" + " Product Rating") local customized ArrayList of type Data having (int, String, char double, float) data type from the class ![]() ![]() Public void addElements(int pid, String pname, char pavailability, double pprice, float prating) ![]() invoking the addElements() method that adds the elements in the ArrayListĬalobj.addElements(pid, pname, pavailability, pprice, prating) Int pid = ĬustomArrayListExample calobj = new CustomArrayListExample() function to the global variable of the class Product(int pid, String pname, char pavailability, double pprice, float prating) constructor of the class that contains types of data which are required global variables of the class to be added in ArrayList class has defined the type of data ArrayList Let's follow the above steps and implement the custom ArrayList.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |