macOS Java: String Justification & Number Formatting

[toddburch]

Left, right, center justification. Seems like a basic feature, but I can't seem to find it. Must be buried in some obscure package. Any ideas?

Also, number formatting. Let's say I want to format numbers 1 through 100 with leading blanks or zeros in a report to keep everything lined up nice and tidy. How to?

Thanks, Todd

 

[Doctor Q]

For turning numbers into strings or justifiying number or strings, you might read up on the NumberFormat class, the Formatter class, and sprintf(), which works like the C function of the same name.

 

[SilentPanda]

Linking to the 1.4.2 API Doctor Q? For shame... 😛

 

[Doctor Q]

Aren't they all equally good for this type of documentation? I just picked at random.

 

[toddburch]

Thanks DrQ. I will look into these.

I guess I'm spoiled with Ruby string handling capabilities, and REXX too.

Todd

 

[tilman]

Left, right, center justification. Seems like a basic feature, but I can't seem to find it. Must be buried in some obscure package. Any ideas?

Also, number formatting. Let's say I want to format numbers 1 through 100 with leading blanks or zeros in a report to keep everything lined up nice and tidy. How to?

Thanks, Todd

If you are using Java 1.5 or newer, you can use the newly introduced formatters:
String.format("%1$-20s %2$-20s %3$6d %4$9.2f", name, operation, getCalls(), getTime());

 

[toddburch]

String.format works perfectly. Not sure how I missed that - it's right there in the doc! Duh!

Thanks, Todd