How to format numbers to a hex strings?

问题

I want to format int numbers as hex strings. System.out.println(Integer.toHexString(1)); prints 1 but I want it as 0x00000001. How do I do that?

回答1:

Try this

System.out.println(String.format("0x%08X", 1));

回答2:

You can use the String.format to format an integer as a hex string.

   System.out.println(String.format("0x%08X", 1));

That is, pad with zeros, and make the total width 8. The 1 is converted to hex for you. The above line gives: 0x00000001 and

   System.out.println(String.format("0x%08X", 234));

gives: 0x000000EA

回答3:

From formatting syntax documented on Java's Formatter class:

Integer intObject = Integer.valueOf(1);
String s = String.format("0x%08x", intObject);
System.out.println(s);

回答4:

I don't know Java too intimately, but there must be a way you can pad the output from the toHexString function with a '0' to a length of 8. If "0x" will always be at the beginning, just tack on that string to the beginning.

回答5:

You can use a java.util.Formatter or the printf method on a PrintStream.

来源：https://stackoverflow.com/questions/13851743/how-to-format-numbers-to-a-hex-strings