Join a list of strings with '[' as prefix, ']' as suffix, and ',' as delimiter using streams.

Praven Kumar — Sat, 04 Apr 2026 13:53:22 +0000

Step 1: Convert List → Stream -> languageList.stream()
Step 2: Collecting using joining()
Collectors.joining(delimiter, prefix, suffix)->.collect(Collectors.joining(",", "[", "]"))

𝐂𝐨𝐥𝐥𝐞𝐜𝐭𝐨𝐫𝐬.𝐣𝐨𝐢𝐧𝐢𝐧𝐠(",", "[", "]") 𝐣𝐨𝐢𝐧𝐬 𝐭𝐡𝐞 𝐞𝐥𝐞𝐦𝐞𝐧𝐭𝐬 𝐨𝐟 𝐚 𝐬𝐭𝐫𝐞𝐚𝐦 𝐢𝐧𝐭𝐨 𝐚 𝐬𝐢𝐧𝐠𝐥𝐞 𝐒𝐭𝐫𝐢𝐧𝐠, 𝐬𝐞𝐩𝐚𝐫𝐚𝐭𝐞𝐝 𝐛𝐲 𝐚 𝐜𝐨𝐦𝐦𝐚, 𝐚𝐧𝐝 𝐚𝐝𝐝𝐬 [ 𝐚𝐭 𝐭𝐡𝐞 𝐛𝐞𝐠𝐢𝐧𝐧𝐢𝐧𝐠 𝐚𝐧𝐝 ] 𝐚𝐭 𝐭𝐡𝐞 𝐞𝐧𝐝.

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Join a list of strings with '[' as prefix, ']' as suffix, and ',' as delimiter using streams.