[ Java 常見問題 ] Pipe OutputStream with InputStream

Source From Here
Question
I want to pass an OutputStream to an InputStream in memory without creating a file on the hard disk.

How-To
Below is the sample code using:
BufferedReader(InputStreamReader(PipedInputStream)) (In) <--- b=""> (Out)PrintStream(PipedOutputStream(PipedInputStream))

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1. package howto;  
2.   
3. import java.io.BufferedReader;  
4. import java.io.InputStreamReader;  
5. import java.io.PipedInputStream;  
6. import java.io.PipedOutputStream;  
7. import java.io.PrintStream;  
8.   
9. public class InOut {  
10.   
11.     public static void main(String[] args) throws Exception{  
12.         PipedInputStream pin = new PipedInputStream();  
13.         PipedOutputStream pout = new PipedOutputStream(pin);  
14.         
15.         PrintStream out = new PrintStream(pout);  
16.         BufferedReader in = new BufferedReader(new InputStreamReader(pin));  
17.         
18.         System.out.println("Writing to output stream...");  
19.         out.println("Hello World!");  
20.         out.flush();  
21.         
22.         System.out.println("Text written: " + in.readLine());  
23.     }  
24. }  

Execution result:

Writing to output stream...
Text written: Hello World!