获取包和类名

/** 时代Java 提供 **/


//package com.nowjava;


public class Main {

    public static void main(String[] argv) {

        Class cls = String.class;

        System.out.println(getPackageAndClassName(cls));

    }


    public static String getPackageAndClassName(Class<?> cls) {

        if (cls != null) {

            StringBuilder builder = new StringBuilder();

            builder.append(cls.getPackage().getName());

            builder.append(".");

            builder.append(c