处理字符串和数组首字母大小写转换

import java.util.Arrays;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Demon {
 public static void main(String[] args) {
        String[] lines = {"it is a pig","a good player."};
        for(int i = 0; i < lines.length; i++){
            lines[i] = changeLine(lines[i]);
        }
        System.out.println(Arrays.deepToString(lines));
    }
    public static String changeLine(String line){
        String result = line.substring(0,1).toUpperCase() + line.substring(1);
        return result;
    } 
 /*public static void main(String[] args) {
        String str = "this is a java test String upcase: 123string";
        System.out.println(str);
        StringBuffer stringbf = new StringBuffer();
        Matcher m = Pattern.compile("([a-z])([a-z]*)", Pattern.CASE_INSENSITIVE).matcher(str);
        while (m.find()) {
            m.appendReplacement(stringbf, m.group(1).toUpperCase() + m.group(2).toLowerCase());
        }
        System.out.println(m.appendTail(stringbf).toString());
    }*/
}