@53、把任意字符串的首字母转成大写,其余为小写 “AdaaaxxccjDDqqql”。wn编辑器
public class Test53 {
public static void main(String[] args) {
String s = "xxccjDDqqql";
String substring2 = s.substring(0, 1);
String substring = s.substring(1);
System.out.println(substring);
System.out.println("-------");
String upperCase = substring2.toUpperCase();
System.out.print(upperCase);
String lowerCase = substring.toLowerCase();
System.out.println(lowerCase);
}
}
```