Java by API/java.io/ByteArrayOutputStream

ByteArrayOutputStream: toByteArray()

   <source lang="java">

import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; public class Main {

 public static void main(String args[]) throws IOException {
   ByteArrayOutputStream outStream = new ByteArrayOutputStream();
   String s = "This is a test.";
   for (int i = 0; i < s.length(); ++i)
     outStream.write(s.charAt(i));
   System.out.println("outstream: " + outStream);
   System.out.println("size: " + outStream.size());
   ByteArrayInputStream inStream = new ByteArrayInputStream(outStream.toByteArray());
   int inBytes = inStream.available();
   System.out.println("inStream has " + inBytes + " available bytes");
   byte inBuf[] = new byte[inBytes];
   int bytesRead = inStream.read(inBuf, 0, inBytes);
   System.out.println(bytesRead + " bytes were read");
   System.out.println("They are: " + new String(inBuf));
 }

}

 </source>
   
  
 
  

ByteArrayOutputStream: writeTo(OutputStream out)

   <source lang="java">
 

import java.io.ByteArrayOutputStream; import java.io.DataOutputStream; import java.io.FileOutputStream; import java.io.IOException; public class Main {

 public static void main(String args[]) throws IOException {
   int howMany = 20;
   // To avoid resizing the buffer, calculate the size of the
   // byte array in advance.
   ByteArrayOutputStream bout = new ByteArrayOutputStream(howMany * 4);
   DataOutputStream dout = new DataOutputStream(bout);
   for (int i = 0; i <= 20; i++) {
     dout.writeInt(i);
   }
   FileOutputStream fout = new FileOutputStream("fibonacci.dat");
   try {
     bout.writeTo(fout);
     fout.flush();
   } finally {
     fout.close();
   }
 }

}

 </source>
   
  
 
  

new ByteArrayOutputStream(int size)

   <source lang="java">
 

/*

* Output:
*  
*/

import java.io.ByteArrayOutputStream; import java.io.FileOutputStream; import java.io.OutputStream; public class MainClass {

 public static void main(String args[]) throws Exception {
   ByteArrayOutputStream f = new ByteArrayOutputStream(12);
   System.out.println("Please 10 characters and a return");
   while (f.size() != 10) {
     f.write(System.in.read());
   }
   System.out.println("Buffer as a string");
   System.out.println(f.toString());
   System.out.println("Into array");
   byte b[] = f.toByteArray();
   for (int i = 0; i < b.length; i++) {
     System.out.print((char) b[i]);
   }
   System.out.println();
   OutputStream f2 = new FileOutputStream("test.txt");
   f.writeTo(f2);
   f.reset();
   System.out.println("10 characters and a return");
   while (f.size() != 10) {
     f.write(System.in.read());
   }
   System.out.println("Done..");
 }

}

 </source>