JAVA将单词首字母大写方法

Posted 2020-09-25 思微随想

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);
	}
	
	
}