diff --git a/Java高级特性 - IO流.txt b/Java高级特性 - IO流.txt
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+1.什么是IO流
+字符 = 字节 + 编码
+字节 = 字符 + 解码
+使用代码读取一个文本文件的数据时，只需要使用输入流即可
+2.字节流-输入输出
+package step2;
+ 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+ 
+public class Task {
+	
+	public void task() throws IOException{
+		/********* Begin *********/
+		File file = new File("src/step2/input/task.txt");
+		FileInputStream fs = new FileInputStream(file);  
+		byte[] b = new byte[8];                         
+		fs.read(b);                                    
+		String str = new String(b,"UTF-8");            
+		System.out.println(str);
+		File dir = new File("src/step2/output");
+		if(!dir.exists()){
+			dir.mkdir();
+		}
+		FileOutputStream out = new FileOutputStream("src/step2/output/output.txt"); 
+		String str1 = "learning practice";
+		byte[] c = str1.getBytes();   
+		out.write(c);                
+		out.flush();                 
+		fs.close();					  
+		out.close();
+        
+		
+		/********* End *********/
+	}
+	
+}
+3.字符流 - 输入输出
+package step3;
+ 
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+ 
+public class Task {
+	
+	public void task() throws IOException{
+		/********* Begin *********/
+		String file1 = "src/step3/input/input.txt";
+		FileReader fr = new FileReader(file1);
+		char[] ch = new char[8];
+		fr.read(ch);
+		String file2 = "src/step3/output/output.txt";
+		FileWriter fw = new FileWriter(file2);
+		fw.write(ch);
+		fr.close();
+		fw.flush();
+		fw.close();
+				
+		
+		
+		/********* End *********/		
+	}
+}
+4.复制文件
+package step4;
+ 
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+ 
+public class Task {
+	
+	public void task() throws IOException{
+		/********* Begin *********/
+		String file1 = "src/step4/input/input.txt";
+		FileInputStream fr = new FileInputStream(file1);
+		byte[] b = new byte[1024];
+		int len = 0;
+		String file2 = "src/step4/output/output.txt";
+		FileOutputStream fw = new FileOutputStream(file2);
+		while((len = fr.read(b))!=-1){
+			fw.write(b,0,len);
+		}
+		fr.close();
+		fw.close();
+		String file3 = "src/step4/input/input.jpg";
+		String file4 = "src/step4/output/output.jpg";
+		FileInputStream fs = new FileInputStream(file3); 
+		FileOutputStream fos = new FileOutputStream(file4);
+		len = 0;       
+		byte[] bys = new byte[1024];   
+		while( (len = fs.read(bys)) != -1){
+			fos.write(bys, 0, len);
+		}
+		
+		fs.close();
+		fos.close();
+		
+		/********* End *********/		
+	}
+}
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