How to capitalize the first letter of a String in Java
In Java, we can use substring(0, 1).toUpperCase() + str.substring(1) to make the first letter of a String as a capital letter (uppercase letter)
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String str = "tahasivaci"; String str1 = str.substring(0, 1).toUpperCase(); // first letter = T String str2 = str.substring(1); // after 1 letter = ahasivaci String result = str.substring(0, 1).toUpperCase() + str.substring(1); // T + ahasivaci |
substring(0,1).toUpperCase() + str.substring(1)
A complete Java example to capitalize the first letter of a String, and a null and length checking.
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package com.tahasivaci.string; public class UppercaseFirstLetter { public static void main(String[] args) { System.out.println(capitalize("tahasivaci")); // Tahasivaci System.out.println(capitalize("a")); // A System.out.println(capitalize("@tahasivaci")); // @tahasivaci //String capitalize = StringUtils.capitalize(str); //System.out.println(capitalize); } // with some null and length checking public static final String capitalize(String str) { if (str == null || str.length() == 0) return str; return str.substring(0, 1).toUpperCase() + str.substring(1); } } |
Output
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Tahasivaci A @tahasivaci |
References
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