{"id":328965,"date":"2023-10-02T20:19:00","date_gmt":"2023-10-02T20:19:00","guid":{"rendered":"https:\/\/www.baeldung.com\/java-char-increment"},"modified":"2023-10-02T20:19:00","modified_gmt":"2023-10-02T20:19:00","slug":"increment-character-in-java","status":"publish","type":"post","link":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/2023\/10\/02\/increment-character-in-java\/","title":{"rendered":"Increment Character in Java"},"content":{"rendered":"

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1. Overview<\/strong><\/h2>\n
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In this tutorial, we’ll learn how to generate a sequence of characters from ‘A’ to ‘Z’ in Java. We’ll do this by incrementing ASCII values.<\/p>\n

We’ll be generating a sequence of characters using a for<\/em><\/a> loop and IntStream <\/em>from the Java 8 Stream API<\/a>.<\/p>\n

2. Using a for <\/em>Loop<\/h2>\n
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We’ll create a list of capital letters from ‘A<\/em>‘ to ‘Z<\/em>‘ using a standard for <\/em>loop:<\/p>\n

@Test \r\nvoid whenUsingForLoop_thenGenerateCharacters(){\r\n    List<Character> allCapitalCharacters = Arrays.asList('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');\r\n  \r\n    List<Character> characters = new ArrayList<>();\r\n    for (char character = 'A'; character <= 'Z'; character++) {\r\n        characters.add(character); \u00a0 \r\n    }\r\n  \r\n    Assertions.assertEquals(alphabets, allCapitalCharacters);\r\n}<\/code><\/pre>\n
Every letter has a unique number in the ASCII system. For example, ‘A’ is represented as 65, ‘B’ as 66, and ‘Z’ as 90.<\/p>\n
In the example above, we first increment the number of each letter in a for loop<\/em>. Then, we convert it to the corresponding ASCII letter.<\/p>\n
Finally, by using the assertEquals()<\/em> method of the Assertions<\/em> class, we check if the generated list matches the expected list of all capital characters.<\/p>\n
3. Using Java 8 IntStream<\/em><\/h2>\n
<\/div>\n
Using Java 8 IntStream<\/em>, we can generate a sequence of all capital letters from ‘A’ to ‘Z’:<\/p>\n
@Test\r\nvoid whenUsingStreams_thenGenerateCharacters() {\r\n    List<Character> allCapitalCharacters = Arrays.asList('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');\r\n    List<Character> characters = IntStream.rangeClosed('A', 'Z')\r\n      .mapToObj(c -> (char) c)\r\n      .collect(Collectors.toList());\r\n    Assertions.assertEquals(characters, allCapitalCharacters);\r\n}<\/code><\/pre>\n
In the above example, employing IntStream<\/em> from Java 8, we generate characters ranging from ‘A’ to ‘Z’ with ASCII values spanning 65 to 90.<\/p>\n
Initially, we map these values to characters and then subsequently collect them into a list.<\/p>\n
To conclude, we employ the assertEquals()<\/em> method from the Assertions<\/em> class to verify if the generated list aligns with the expected list of all capital letters.<\/p>\n
4. Conclusion<\/h2>\n
<\/div>\n
In this short article, we explored how we can use the Stream\u00a0API and for<\/em> loop to increment the ASCII values of the characters and print their corresponding values.<\/p>\n
As usual, the source code for the examples is available over on GitHub<\/a>.<\/p>\n
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<\/p>","protected":false},"excerpt":{"rendered":"
\"\"<\/p>\n
Learn how to generate a sequence of characters from ‘A’ to ‘Z’ in Java.<\/p>\n
<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/a>\u00a0<\/div>\n<\/div>","protected":false},"author":214,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Increment Character in Java - ITTeacherITFreelance.hk","description":"Learn how to generate a sequence of characters from 'A' to 'Z' in Java. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0"},"footnotes":""},"categories":[6,1307],"tags":[10673],"_links":{"self":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/328965"}],"collection":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/214"}],"replies":[{"embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=328965"}],"version-history":[{"count":1,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/328965\/revisions"}],"predecessor-version":[{"id":328966,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/328965\/revisions\/328966"}],"wp:attachment":[{"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=328965"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=328965"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itteacheritfreelance.hk\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=328965"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}