Print String as Bytes

Question

Can somebody tell me how to print a string as bytes i.e. its corresponding ASCII code?!

My input is a normal string like "9" and the output should be the corresponding ASCII value of character '9'

Solution 1

Use String.getBytes() method.

byte []bytes="Hello".getBytes();
for(byte b:bytes)
  System.out.println(b);

Solution 2

If you're looking for a Byte Array - see this question: How to convert a Java String to an ASCII byte array?

To get the ascii value of each individual character you can do:

String s = "Some string here";

for (int i=0; i<s.length();i++)
  System.out.println("ASCII value of: "+s.charAt(i) + " is:"+ (int)s.charAt(i) );

Solution 3

Hi I am not sure what do you want but may be the following method helps to print it .

    String str = "9";

    for (int i = 0; i < str.length(); i++) {
        System.out.println(str.charAt(i) + " ASCII " + (int) str.charAt(i));
    }

you can see it at http://www.java-forums.org/java-tips/5591-printing-ascii-values-characters.html

Solution 4

A naive approach would be:

1. You can iterate through a byte array:

   final byte[] bytes = "FooBar".getBytes(); for (byte b : bytes) { System.out.print(b + " "); }

   Result: 70 111 111 66 97 114

2. or, through a char array and convert the char into primitive int

   for (final char c : "FooBar".toCharArray()) { System.out.print((int) c + " "); }

   Result: 70 111 111 66 97 114

3. or, thanks to Java8, with a forEach through the inputSteam: "FooBar".chars().forEach(c -> System.out.print(c + " "));

   Result: 70 111 111 66 97 114

4. or, thanks to Java8 and Apache Commons Lang: final List<Byte> list = Arrays.asList(ArrayUtils.toObject("FooBar".getBytes())); list.forEach(b -> System.out.print(b + " "));

   Result: 70 111 111 66 97 114

A better approach would use the charset (ASCII, UTF-8, ...):

// Convert a String to byte array (byte[])
final String str = "FooBar";
final byte[] arrayUtf8 = str.getBytes("UTF-8");
for(final byte b: arrayUtf8){
  System.out.println(b + " ");
}

Result: 70 111 111 66 97 114

final byte[] arrayUtf16 = str.getBytes("UTF-16BE");
  for(final byte b: arrayUtf16){
System.out.println(b);
}

Result: 70 0 111 0 111 0 66 0 97 0 114

Hope it has helped.

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Comments

[hansvb]

Works great for ASCII, but if you run into the eight-bit-half, you will have negative numbers, because the powers that be decided that bytes in Java are signed.