Sometimes we need to convert InputStream to byte array in Java, or you can say reading InputStream as byte array, In order to pass output to a method which accept byte array rather than InputStream. One popular example of this, I have seen is older version of Apache commons codec, while converting byte array to hex string. Though, later version of same library do provide an overloaded method, to accept InputStream. Java File API provides excellent support to read files like image, text as InputStream in Java program, but as I said, sometime you need need String or byte array, instead of InputStream . Earlier we have seen 5 ways to convert InputStream to String in Java , we can use some of the techniques from there while getting byte array from InputStream in Java. If you like to use Apache commons library, which I think you should, there is a utility class called IOUtils, which can be used to easily convert InputStream to byte array in Java. If you don't like using open source library for such kind of thinks, and like to write your own method, you can easily do so by using standard Java File API. In this Java tutorial we will see examples of both ways to convert InputStream to byte array in Java.
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How to convert decimal to binary octal and hex String in Java Program
This article is about a simple java program which converts decimal number to binary, octal and hexadecimal format. When it was first came into my mind I though I would probably need to write whole code to convert decimal to various other radix or base numbers but when I looked Integer class and saw these two way of converting decimal to binary etc I was simple amazed. It’s indeed extremely easy to do this in java and you can also write this program or use at it is.
Converting decimal to binary in Java Example
Java has many ways to change number system of particular number, you can convert any decimal number into either binary system, hexadecimal system or octal system by following same procedure. here is code example of converting any decimal number into binary number in Java.//first way
//decimal to binary
String binaryString = Integer.toBinaryString(number);
System.out.println("decimal to binary: " + binaryString);
//decimal to octal
String octalString = Integer.toOctalString(number);
System.out.println("decimal to octal: " + octalString);
//decimal to hexadecimal
String hexString = Integer.toHexString(number);
System.out.println("decimal to hexadecimal: " + hexString);
//second way
binaryString = Integer.toString(number,2);
System.out.println("decimal to binary using Integer.toString: " + binaryString);
//decimal to octal
octalString = Integer.toString(number,8);
System.out.println("decimal to octal using Integer.toString: " + octalString);
//decimal to hexadecimal
hexString = Integer.toString(number,16);
System.out.println("decimal to hexadecimal using Integer.toString: " + hexString);
Nice and little tip to convert decimal to binary or decimal to Octal, hex. This comes very handy many times when we want to do a quick conversion.
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