How to print the data in byte array as characters?
JavaArraysJava Problem Overview
In my byte array I have the hash values of a message which consists of some negative values and also positive values. Positive values are being printed easily by using the (char)byte[i]
statement.
Now how can I get the negative value?
Java Solutions
Solution 1 - Java
How about Arrays.toString(byteArray)
?
Here's some compilable code:
byte[] byteArray = new byte[] { -1, -128, 1, 127 };
System.out.println(Arrays.toString(byteArray));
Output:
[-1, -128, 1, 127]
Why re-invent the wheel...
Solution 2 - Java
If you want to print the bytes as chars you can use the String constructor.
byte[] bytes = new byte[] { -1, -128, 1, 127 };
System.out.println(new String(bytes, 0));
Solution 3 - Java
Well if you're happy printing it in decimal, you could just make it positive by masking:
int positive = bytes[i] & 0xff;
If you're printing out a hash though, it would be more conventional to use hex. There are plenty of other questions on Stack Overflow addressing converting binary data to a hex string in Java.
Solution 4 - Java
Try it:
public static String print(byte[] bytes) {
StringBuilder sb = new StringBuilder();
sb.append("[ ");
for (byte b : bytes) {
sb.append(String.format("0x%02X ", b));
}
sb.append("]");
return sb.toString();
}
Example:
public static void main(String []args){
byte[] bytes = new byte[] {
(byte) 0x01, (byte) 0xFF, (byte) 0x2E, (byte) 0x6E, (byte) 0x30
};
System.out.println("bytes = " + print(bytes));
}
Output: bytes = [ 0x01 0xFF 0x2E 0x6E 0x30 ]
Solution 5 - Java
Try this one : new String(byte[])
Solution 6 - Java
byte[] buff = {1, -2, 5, 66};
for(byte c : buff) {
System.out.format("%d ", c);
}
System.out.println();
gets you
1 -2 5 66
Solution 7 - Java
in Kotlin you can use :
println(byteArray.contentToString())