package javaIO; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Arrays; public class IOExample { public static void main(String[] args) throws IOException{ byte[] src={1,2,3,4}; byte[] dest=null; InputStream is=new ByteArrayInputStream(src); OutputStream os=new ByteArrayOutputStream(); int data=-1; while((data=is.read())!=-1) { os.write(data); } dest=((ByteArrayOutputStream)os).toByteArray(); System.out.println(Arrays.toString(src)); System.out.println(Arrays.toString(dest)); } }