public class FirstLetterUppercase { public static void main(String[] args){ System.out.println(new FirstLetterUppercase().upperFirstLatter("letter")); System.out.println(new FirstLetterUppercase().upperFirstLatter2("letter"));、
} /** * 方法一 * @param letter * @return */ public String upperFirstLatter(String letter){ char[] chars = letter.toCharArray(); if(chars[0]>='a' && chars[0]<='z'){ chars[0] = (char) (chars[0]-32); } return new String(chars); } /** * 方法二 * @param letter * @return */ public String upperFirstLatter2(String letter){ return letter.substring(0, 1).toUpperCase()+letter.substring(1); } }