StringUtils.md

StringUtils

Contents

• Joining Collections
• Joining Collections with a function

Joining Collections

Sometimes you have a list that needs to become a string. For example

List<Integer> number = Arrays.asList(1, 2, 3, 4, 5);
String text = StringUtils.join(number, ", ");

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will produce

1, 2, 3, 4, 5

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by invoking the .toString() on each object in the collection.

Joining Collections with a function

if .toString() isn't enough, you can pass in a lambda to do the extra transformation as well. For example:

List<Integer> number = Arrays.asList(1, 2, 3, 4, 5);
String text = StringUtils.join(number, ", ", n -> StringUtils.padNumber(n, 3));

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will Produce

001, 002, 003, 004, 005

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