太厉害了，这款开源类库可以帮你简化每一行代码

String param = "10";
int paramInt = Convert.toInt(param);
int paramIntDefault = Convert.toInt(param, 0);

String dateStr = "2020年09月29日";
Date date = Convert.toDate(dateStr);

String unicodeStr = "沉默王二";
String unicode = Convert.strToUnicode(unicodeStr);

Date date = DateUtil.date();

String dateStr = "2020-09-29";
Date date = DateUtil.parse(dateStr);

String dateStr1 = "2020-09-29 22:33:23";
Date date1 = DateUtil.parse(dateStr1);

String dateStr2 = "2020-10-01 23:34:27";
Date date2 = DateUtil.parse(dateStr2);

long betweenDay = DateUtil.between(date1, date2, DateUnit.MS);

// 输出：2天1小时1分4秒
String formatBetween = DateUtil.formatBetween(betweenDay, BetweenFormater.Level.SECOND);

// 射手座
String zodiac = DateUtil.getZodiac(Month.DECEMBER.getValue(), 10);
// 蛇
String chineseZodiac = DateUtil.getChineseZodiac(1989);

BufferedInputStream in = FileUtil.getInputStream("hutool/origin.txt");
BufferedOutputStream out = FileUtil.getOutputStream("hutool/to.txt");
long copySize = IoUtil.copy(in, out, IoUtil.DEFAULT_BUFFER_SIZE);

FileUtil.getInputStream("origin.txt")

FileUtil.getInputStream("hutool/origin.txt")

String template = "{}，一枚沉默但有趣的程序员，喜欢他的文章的话，请微信搜索{}";
String str = StrUtil.format(template, "沉默王二", "沉默王二");
// 沉默王二，一枚沉默但有趣的程序员，喜欢他的文章的话，请微信搜索沉默王二

package com.itwanger.hutool.reflect;

import cn.hutool.core.util.ReflectUtil;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 * @author 微信搜「沉默王二」，回复关键字 PDF
 */
public class ReflectDemo {
    private int id;

    public ReflectDemo() {
        System.out.println("构造方法");
    }

    public void print() {
        System.out.println("我是沉默王二");
    }

    public static void main(String[] args) throws IllegalAccessException {
        // 构建对象
        ReflectDemo reflectDemo = ReflectUtil.newInstance(ReflectDemo.class);

        // 获取构造方法
        Constructor[] constructors = ReflectUtil.getConstructors(ReflectDemo.class);
        for (Constructor constructor : constructors) {
            System.out.println(constructor.getName());
        }

        // 获取字段
        Field field = ReflectUtil.getField(ReflectDemo.class, "id");
        field.setInt(reflectDemo, 10);
        // 获取字段值
        System.out.println(ReflectUtil.getFieldValue(reflectDemo, field));

        // 获取所有方法
        Method[] methods = ReflectUtil.getMethods(ReflectDemo.class);
        for (Method m : methods) {
            System.out.println(m.getName());
        }

        // 获取指定方法
        Method method = ReflectUtil.getMethod(ReflectDemo.class, "print");
        System.out.println(method.getName());


        // 执行方法
        ReflectUtil.invoke(reflectDemo, "print");
    }
}

ZipUtil.zip("hutool", "hutool.zip");
File unzip = ZipUtil.unzip("hutool.zip", "hutoolzip");

String ID_18 = "321083197812162119";
String ID_15 = "150102880730303";

boolean valid = IdcardUtil.isValidCard(ID_18);
boolean valid15 = IdcardUtil.isValidCard(ID_15);

Dict dict = Dict.create()
        .set("age", 18)
        .set("name", "沉默王二")
        .set("birthday", DateTime.now());

int age = dict.getInt("age");
String name = dict.getStr("name");

/**
 * @author 微信搜「沉默王二」，回复关键字 PDF
 */
public class ConsoleDemo {
    public static void main(String[] args) {
        // 打印字符串
        Console.log("沉默王二，一枚有趣的程序员");

        // 打印字符串模板
        Console.log("洛阳是{}朝古都",13);

        int [] ints = {1,2,3,4};
        // 打印数组
        Console.log(ints);
    }
}

Validator.isEmail("沉默王二");
Validator.isMobile("itwanger.com");

BiMap<String, String> biMap = new BiMap<>(new HashMap<>());
biMap.put("wanger", "沉默王二");
biMap.put("wangsan", "沉默王三");

// get value by key
biMap.get("wanger");
biMap.get("wangsan");

// get key by value
biMap.getKey("沉默王二");
biMap.getKey("沉默王三");

ImgUtil.scale(
        FileUtil.file("hutool/wangsan.jpg"),
        FileUtil.file("hutool/wangsan_small.jpg"),
        0.5f
);

ImgUtil.cut(
        FileUtil.file("hutool/wangsan.jpg"),
        FileUtil.file("hutool/wangsan_cut.jpg"),
        new Rectangle(200, 200, 100, 100)
);

ImgUtil.pressText(//
        FileUtil.file("hutool/wangsan.jpg"),
        FileUtil.file("hutool/wangsan_logo.jpg"),
        "沉默王二", Color.WHITE,
        new Font("黑体", Font.BOLD, 100),
        0,
        0,
        0.8f
);

/**
 * @author 微信搜「沉默王二」，回复关键字 PDF
 */
public class SettingDemo {
    private final static String SETTING = "hutool/example.setting";
    public static void main(String[] args) {
        // 初始化 Setting
        Setting setting = new Setting(SETTING);

        // 读取
        setting.getStr("name", "沉默王二");

        // 在配置文件变更时自动加载
        setting.autoLoad(true);

        // 通过代码方式增加键值对
        setting.set("birthday", "2020年09月29日");
        setting.store(SETTING);
    }
}

/**
 * @author 微信搜「沉默王二」，回复关键字 PDF
 */
public class LogDemo {
    private static final Log log = LogFactory.get();

    public static void main(String[] args) {
        log.debug("难得糊涂");
    }
}

StaticLog.info("爽啊 {}.", "沉默王二的文章");

Cache<String, String> fifoCache = CacheUtil.newFIFOCache(3);
fifoCache.put("key1", "沉默王一");
fifoCache.put("key2", "沉默王二");
fifoCache.put("key3", "沉默王三");
fifoCache.put("key4", "沉默王四");

// 大小为 3，所以 key3 放入后 key1 被清除
String value1 = fifoCache.get("key1");

Cache<String, String> lfuCache = CacheUtil.newLFUCache(3);

lfuCache.put("key1", "沉默王一");
// 使用次数+1
lfuCache.get("key1");
lfuCache.put("key2", "沉默王二");
lfuCache.put("key3", "沉默王三");
lfuCache.put("key4", "沉默王四");

// 由于缓存容量只有 3，当加入第 4 个元素的时候，最少使用的将被移除（2,3被移除）
String value2 = lfuCache.get("key2");
String value3 = lfuCache.get("key3");

Cache<String, String> lruCache = CacheUtil.newLRUCache(3);

lruCache.put("key1", "沉默王一");
lruCache.put("key2", "沉默王二");
lruCache.put("key3", "沉默王三");
// 使用时间近了
lruCache.get("key1");
lruCache.put("key4", "沉默王四");

// 由于缓存容量只有 3，当加入第 4 个元素的时候，最久使用的将被移除（2）
String value2 = lruCache.get("key2");
System.out.println(value2);

/**
 * @author 微信搜「沉默王二」，回复关键字 PDF
 */
public class SecureUtilDemo {
    static AES aes = SecureUtil.aes();
    public static void main(String[] args) {
        String encry = aes.encryptHex("沉默王二");
        System.out.println(encry);
        String oo = aes.decryptStr(encry);
        System.out.println(oo);
    }
}