JCH
Java Community | Help. Code. Learn.•6mo ago
userexit

Can someone help understand this code snippet

    private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
                                        int which) throws NoSuchMethodException
    {
        ReflectionFactory fact = getReflectionFactory();
        Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
        for (Constructor<T> constructor : constructors) {
            if (arrayContentsEq(parameterTypes,
                                fact.getExecutableSharedParameterTypes(constructor))) {
                return constructor;
            }
        }
        throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
    }
    private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
                                        int which) throws NoSuchMethodException
    {
        ReflectionFactory fact = getReflectionFactory();
        Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
        for (Constructor<T> constructor : constructors) {
            if (arrayContentsEq(parameterTypes,
                                fact.getExecutableSharedParameterTypes(constructor))) {
                return constructor;
            }
        }
        throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
    }
3 Replies
JavaBot
JavaBot•6mo ago
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reiwa
reiwa•6mo ago
this is a private helper method that finds a specific constructor within a class. the getConstructor0 method takes an array of Class objects representing the parameter types of the constructor being searched for, and an integer which to look for either public or private constructors. it instantiates a ReflectionFactory object, which itself has helper search methods. it then gets the array of constructors to search through. it iterates through the array of constructors and for each of them, compares its parameter types with the provided parameterTypes array, using the helper methods (arrayContentsEq and getExecutableSharedParameterTypes) from the ReflectionFactory object it instantiated earlier. if a constructor with matching parameter types is found, it is immediately returned. otherwise, a NoSuchMethodException is thrown
JavaBot
JavaBot•6mo ago
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