您最常重用的课程是什么？

一段时间后，每个程序员都会得到一组实用程序类。其中一些是真正的编程珍珠，并且可以在您的多个项目中重复使用。例如，在java中：

 class Separator {

        private String separator;
        private boolean called;

        public Separator(String aSeparator) {
            separator = aSeparator;
            called = false;
        }

        @Override
        public String toString() {
            if (!called) {
                called = true;
                return "";
            } else {
                return separator;
            }
        }
    }

and:

public class JoinHelper {

    public static <T> String join(T... elements) {
        return joinArray(" ", elements);
    }

    public static <T> String join(String separator, T... elements) {
        return joinArray(separator, elements);
    }

    private static <T> String joinArray(String sep, T[] elements) {
        StringBuilder stringBuilder = new StringBuilder();
        Separator separator = new Separator(sep);

        for (T element : elements) {
           stringBuilder.append(separator).append(element);
        }

        return stringBuilder.toString();
    }
}

What is your最重用的类？

System.Object http://msdn.microsoft.com/en-us/library/system.object.aspx- 几乎我所有的类型都扩展了它。