FileOutputStream fp = new FileOutputStream("bb.txt",true);
		fp.write(100);
		fp.write(97);
		fp.write(98);
		fp.close();

FileInputStream fill=new FileInputStream("aa.txt");
		FileOutputStream foll= new FileOutputStream("zz.txt");
		//利用小数组拷贝文件，比较合理
		byte [] bt=new byte[1024*9];
		int len;
		while((len=fill.read(bt))!=-1){
			foll.write(bt, 0, len);
		}
		fill.close();
		foll.close();
___________________________________________________________________________________________
//利用缓冲对象拷贝文件，与小数组速率差不多
		BufferedInputStream bui=new BufferedInputStream(new FileInputStream("aa.txt"));
		BufferedOutputStream buo=new BufferedOutputStream( new FileOutputStream("zz.txt"));
		int b;
		while((b=bui.read())!=-1){
			buo.write(b);
		}
		bui.close();
		buo.close();

//字节输出流输出字符串需先转换成字节数组
FileOutputStream fio =new FileOutputStream("bb.txt");
		fio.write("我的天，你怎么这么帅！".getBytes());
		fio.close();

public static void main(String[] args) throws IOException {
		BufferedReader br=new BufferedReader(new FileReader("aa.txt"));
		BufferedWriter bw=new BufferedWriter(new FileWriter("kk.txt"));
		String line;
		while((line=br.readLine())!=null){
			bw.write(line);
			//bw.newLine();
			bw.write("\r\n");
		}
		br.close();
		bw.close();

//流尽量晚开早管
	public static void main(String[] args) throws IOException {
		BufferedReader brc=new BufferedReader(new FileReader("aa.txt"));
		ArrayList<String>all=new ArrayList<>();
		String line;
		while((line=brc.readLine())!=null){
			all.add(line);
		}
		brc.close();
		BufferedWriter bwc=new BufferedWriter(new FileWriter("bb.txt"));
		for(int i=all.size()-1;i>=0;i--){
			bwc.write(all.get(i));
			bwc.newLine();
		}
		bwc.flush();
	}

package Demo_FileRead_FileWrite;

public class demo6_Wrap {
//装饰设计模式：耦合性不强，被装饰的类与装饰的类变换无关
	public static void main(String[] args) {
		WrapStudent ws=new WrapStudent(new Student());
		ws.code();
	}

}
interface Code{
	 public void code();
}
class Student implements Code{

	@Override
	public void code() {
		System.out.println("我会什么");
		System.out.println("我会：");	
	}
	
}
class WrapStudent implements Code{
	//1.引用被装饰的类
	Student s;
	//2.在构造方法中传入被装饰的类的对象
	public WrapStudent(Student s) {
		this.s=s;
	}
	@Override
	//3.对原有方法进行升级
	public void code() {
		s.code();
		System.out.println("ssh");
		System.out.println("ssm");
		System.out.println("大数据");
		
	}
	
}

//可以这样写
while((b=bufferedReader.read())!=-1){
			char ch=(char)b;
			/*if(!tMap.containsKey(ch)){
				tMap.put(ch, 1);
			}else {
				tMap.put(ch, tMap.get(ch)+1);
			}*/
			tMap.put(ch, !tMap.containsKey(ch)?1:tMap.get(ch)+1);
		}

package Demo_FileRead_FileWrite;

import java.io.File;
import java.util.Scanner;

public class demo10_test3 {

	public static void main(String[] args) {
		File dir=Getder();
		pringJavaFile(dir);

	}
	public static File Getder(){
		Scanner scanner =new Scanner(System.in);
		System.out.println("请输入文件夹路径");
		while(true){
			String nextLine = scanner.nextLine();
			File file =new File(nextLine);
			if(!file.exists()){
				System.out.println("您输入的路径不存在！");
			}else if (file.isFile()) {
				System.out.println("您输入的是文件路径");
			}else {
				return file;
			}
		}
	}
	public static void 	pringJavaFile(File dir){
		File[] listFiles = dir.listFiles();
		for (File file : listFiles) {
			if(file.isFile()&&file.getName().endsWith("jpg")){
				System.out.println(file);
			}else if (file.isDirectory()) {
				//利用递归思想
				pringJavaFile(file);
			}
		}
	}
}

package Demo_OtherIO;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;

public class demo8_Property {

	public static void main(String[] args) throws IOException, IOException {
		//demo1();
		Properties pr2=new Properties();
		pr2.setProperty("name","张三");
		pr2.setProperty("age","23");
		pr2.setProperty("tel","134526735632");
		Enumeration<String> propertyNames = (Enumeration<String>) pr2.propertyNames();
		while(propertyNames.hasMoreElements()){
			String key = propertyNames.nextElement();
			String value = pr2.getProperty(key);
			System.out.println(key+"="+value);
		}
	}

	private static void demo1() throws IOException, FileNotFoundException {
		//properties 是一个Map集合，没有泛型，默认是Object
		Properties pr1=new Properties();
		pr1.load(new FileInputStream("properties"));
		pr1.setProperty("tel", "13548928542");
		pr1.store(new FileOutputStream("properties"), null);
	}

}