printf

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column.column@gmail.com - 22 Mar 2008 13:18 GMT

Hello,

How to print formatted text in java? For example I need to print
int=55 in hex format.

Thank You

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Lasse Reichstein Nielsen - 22 Mar 2008 13:33 GMT

> How to print formatted text in java? For example I need to print
> int=55 in hex format.

As you said in the subject: printf

System.out.printf("%2x%n", 55);

<URL:http://java.sun.com/j2se/1.5.0/docs/api/java/io/PrintStream.html#printf(java.lan
g.String, java.lang.Object...)>

/L

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column.column@gmail.com - 22 Mar 2008 17:39 GMT

> System.out.printf("%2x%n", 55);

Is not good, must be object type arguments array. I'm wrong?

printf(String format, Object... args)
A convenience method to write a formatted string to this output stream
using the specified format string and arguments.

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Lew - 22 Mar 2008 18:46 GMT

Lasse Reichstein Nielsen wrote:

>> System.out.printf("%2x%n", 55);

> Is not good, must be object type arguments array. I'm wrong?
> printf(String format, Object... args)

And yet it works. Didn't you try it?

Lasse Reichstein Nielsen gave you the right advice.

It's an interesting exercise to figure out why it works. (Autoboxing)

<http://java.sun.com/javase/6/docs/api/java/io/PrintStream.html#printf(java.lang.
String,%20java.lang.Object...)>

> An invocation of this method of the form out.printf(format, args)
> behaves in exactly the same way as the invocation
> out.format(format, args)

format()'s Javadocs in turn reference
<http://java.sun.com/javase/6/docs/api/java/util/Formatter.html#syntax>

wherein they explain that a '%x' conversion will handle

> ... Java integral types: byte, Byte, short, Short, int and Integer, long, Long, and BigInteger

The Javadocs are a handy source of information.

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Lew

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