Character大小写转化问题!
import java.util.Scanner;
public class Test4 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
String line = sc.nextLine();
char[] cs = line.toCharArray();
for (int i = 0; i < cs.length; i++) {
if (Character.isLowerCase(cs[i])) {
Character.toUpperCase(cs[i]);
} else {
Character.toLowerCase(cs[i]);
}
System.out.print(cs[i]);
}
}
}
输入:AAAAbbbb
输出:aaaaBBBB
上面的Character.toUpperCase(cs[i]);和Character.toLowerCase(cs[i]);为甚么不起作用?求解!