//獲取Class類型信息
public class Text02 {
	public static void main(String[] args) throws ClassNotFoundException {
		//方式1:通過(guò)類名
		Class stringClass1 = String.class;
		
		//方式2：通過(guò)Class類的forName()方法
		Class stringClass2 = Class.forName("java.lang.String");
		
		//方式3：通過(guò)對(duì)象調(diào)用getClass()方法
		Class stringClass3 = "".getClass();
		
		System.out.println(stringClass1.hashCode());//1604839423
		System.out.println(stringClass2.hashCode());//1604839423
		System.out.println(stringClass3.hashCode());//1604839423
	}

}

//Class類型的對(duì)象使用場(chǎng)景1
public class Text03 {
	public static void main(String[] args) {
		String json= "{\"name\":\"長(zhǎng)安荔枝\",\"favCount\":234}";
		
		//方法定義
		Document doc=JSON.parseObject(json,Document.class);
		System.out.println(doc.getName());
		System.out.println(doc.getFavCount());
	}

}

//Class類型的對(duì)象使用場(chǎng)景2
//獲取豐富的類型內(nèi)容
public class Text04 {
	public static void main(String[] args) throws ClassNotFoundException {
		Class clz = Class.forName("java.util.HashMap");
		
		//獲取類名
		System.out.println("完全限定名："+clz.getName());
		System.out.println("簡(jiǎn)單的類名："+clz.getSimpleName());
		
		//獲取包名
		System.out.println("package"+clz.getPackage().getName());
		System.out.println();
		
		//獲取成員變量
		Field[] fieldArray =clz.getDeclaredFields();
		System.out.println("成員變量(字段)");
		for(Field field:fieldArray) {
			System.out.println(field);
		}
		System.out.println();
		
		//獲取成員方法
		Method[] methodArray = clz.getDeclaredMethods();
		System.out.println("成員方法");
		for(Method method:methodArray) {
			System.out.println(method);
		}	
	}
}

//通過(guò)反射的方式，創(chuàng)建對(duì)象
public class Text05 {
	public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
		Class clz = Class.forName("com.apesource.demo01.Document");
		
		//方式1：直接通過(guò)Class對(duì)象，調(diào)用newInstance()方法
		Object objx = clz.newInstance();//相當(dāng)于在執(zhí)行無(wú)參構(gòu)造方法
		
		//方式2：通過(guò)構(gòu)造器(構(gòu)造方法)
		//無(wú)參構(gòu)造方法
		Constructor constructor1 = clz.getDeclaredConstructor();//獲取無(wú)參構(gòu)造方法
		System.out.println(constructor1);
		Object obj1 = constructor1.newInstance();//執(zhí)行構(gòu)造器(構(gòu)造方法),創(chuàng)建對(duì)象
		
		//有參構(gòu)造方法
		Constructor constructor2 = clz.getDeclaredConstructor(String.class);//獲取有參構(gòu)造方法
		System.out.println(constructor2);
		Object obj2 = constructor2.newInstance("兩京十五日");
		
		Constructor constructor3 = clz.getDeclaredConstructor(int.class);//獲取有參構(gòu)造方法
		System.out.println(constructor3);
		Object obj3 = constructor3.newInstance(34);
		
		Constructor constructor4 = clz.getDeclaredConstructor(String.class,int.class);//獲取有參構(gòu)造方法
		System.out.println(constructor4);
		Object obj4 = constructor4.newInstance("風(fēng)起隴西",64);
		
		System.out.println(objx);
		System.out.println(obj1);
		System.out.println(obj2);
		System.out.println(obj3);
		System.out.println(obj4);
	}

public class Text06 {
	public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
		Class clz = Class.forName("com.apesource.demo01.Document");
		
		//獲取一組構(gòu)造器
		Constructor[] constructorArray1 = clz.getConstructors();//public
		Constructor[] constructorArray2 = clz.getDeclaredConstructors();//public、private
		
		//獲取指定構(gòu)造器
		Constructor constructor1 = clz.getConstructor();
		Constructor constructor2 = clz.getDeclaredConstructor(String.class);
		System.out.println(constructor1);
		System.out.println(constructor2);
		
		//調(diào)用私有構(gòu)造器，必須設(shè)置它的訪問(wèn)全限
		constructor2.setAccessible(true);
		
		//調(diào)用構(gòu)造器，創(chuàng)建對(duì)象
		Object obj = constructor2.newInstance("長(zhǎng)安三萬(wàn)里");
		System.out.println(obj);
	}

}

public class Text08 {
	public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
		//硬編碼的方式
//		Document doc1 = new Document();
//		doc1.setName("海底兩萬(wàn)里");
//		doc1.setFavCount(10025);
		
		//反射的方式
		Class clz = Class.forName("com.apesource.demo01.Document");//獲取類型信息
		Object doc1 = clz.newInstance();//創(chuàng)建對(duì)象
		
		//獲取指定名稱和參數(shù)類型的方法
		Method setNameMethod = clz.getMethod("setName", String.class);
		Method setFavCountMethod = clz.getMethod("setFavCount", int.class);
		
		//執(zhí)行方法
		//doc1.setName("海底兩萬(wàn)里");
		setNameMethod.invoke(doc1, "海底兩萬(wàn)里");
		//doc1.setFavCount(10025);
		setFavCountMethod.invoke(doc1, 10025);
		
		System.out.println(doc1);
		
	}

}

public class Text09_01 {
	public static void main(String[] args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException, ClassNotFoundException {
		//硬編碼的方式
		//調(diào)用靜態(tài)方法
//		Document.dosth();
		
		String ret1 = String.format("HashMap的默認(rèn)初始容量是%d,加載因子是%.2f", 16,0.75f);
		System.out.println(ret1);
		
		
		//反射的方式
//		Class clz = Class.forName("com.apesource.demo01.Document");
//		Method dosthMethod = clz.getMethod("dosth");
//		dosthMethod.invoke(null);
		
		Class clz = String.class;
		Method formatMethod = clz.getMethod("format", String.class,Object[].class);
		String ret2 = formatMethod.invoke(null, "HashMap的默認(rèn)初始容量是%d,加載因子是%.2f",new Object[] {16,0.75f}).toString();
		
		System.out.println(ret2);
	}

}