不知道对不对
package day0514;
public class luntan {
public static void main(String[] args) {
String s = twoChar("java", 12);
System.out.println(s);
}
public static String twoChar(String str, int x) {
String s;
if (str.length() - x == 1 || str.length() - x > str.length() || str.length() - x <= 0) {
s = (str.charAt(0) + "") + (str.charAt(1) + "");
return s;//输入的整数x是最后一位或者是负数或者比字符串的长度大
} else {
s = (str.charAt(x) + "") + (str.charAt(x + 1) + "");
return s;//输入的整数在0到字符串长度-1的值之间
}
}
} |
