Why I cannot format string in Java/Kotlin

Question

Here is a string template read from file.

Name: %s
Age: %d

After I read it from file, I want to format this string using given name and age.

var template = File("file_path").readText()

MessageFormat.format(template, "Bod", 123)

print(template)

However I cannot format template. Its output is.

Name: %s
Age: %d

You mixed MessageFormat and String formatting. String.format use %s where MessageFormat use {0} — AxelH
– AxelH, Commented Apr 27, 2018 at 12:28
你这样整是不行的，要传一个数组的话建议你使用我之前给的那种直接把数组放在第二个参数的做法(String.format("%s", *array) — ice1000
– ice1000, Commented Apr 27, 2018 at 16:22

ice1000 · Accepted Answer · 2018-04-27 12:07:47Z

2

You should either use String.format instead of MessageFormat.format or use {0}/{1} instead of %s/%d.

answered Apr 27, 2018 at 12:07

ice1000

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4 Comments

CoXier Over a year ago

If i want to put an array, what can I do?

DodgyCodeException Over a year ago

Just pass individual array elements.

CoXier Over a year ago

@DodgyCodeException Do I have to put array elements one by one? Can I directly pass array?

Salem Over a year ago

@CoXier if the array contains all of your arguments you can pass it as a vararg parameter using the * operator (*array), this is the Kotlin equivalent of passing a T[] to a T... in Java

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