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Thread: forName() method

  1. #1
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    Default forName() method

    As I thought I understood it, the forName() method instantiates a class listed inside the parenthesis of the method.
    ex. Ben = Class.forName("nameBen");

    I'm confused when I see an example where the argument passed to the method is an arguments[] array with 0 slots.

    ben = Class.forName(arguments[0]);

    So far in the code the only array would be in the run method at main(String[] arguments) {

    I don't really understand what is happening when "arguments[0]" is being given to the forName method.

    *I was thinking it might be referring to the first argument in the class which maybe would be the Class variable: Class ben;
    but then why would not just the name of that class variable be used?

    src coude looks like this

    import java.lang.reflect.*;

    public class AppFinder {
    public static void main(String[] arguments) {
    if (arguments.length == 1) {
    Class ben;
    try {
    boolean isApplication = false;
    ben = Class.forName(arguments[0]);
    Last edited by JavaBenGinner; October 5th, 2012 at 12:50 AM.


  2. #2
    Super Moderator jps's Avatar
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    Default Re: forName() method

    Using your favorite search engine, try:
    using command line arguments in java

    If you have questions after some research feel free to post again.

    Basically in:
    ben = Class.forName(arguments[0]);
    the:
    arguments[0]
    is referring to the first element of:
    String[] arguments
    in:
    public static void main(String[] arguments) {
    such that the first command line argument is assigned to the variable ben

  3. #3
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    Default Re: forName() method

    Usually, a class can be used loaded implicitly on an on-demand basis when you create the first object of the class using the "new" operator.
    But you can also use Class.forName() methods to load a class expplicitly:
    static Class<?> forName(String className) - Returns the Class object associated with the class or interface with the given string name.
    static Class<?> forName(String name, boolean initialize, ClassLoader loader) - Returns the Class object associated with the class or interface with the given string name, using the given class loader.

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