import java.util.Scanner;
public class Punctuation {
public static void main(String[] args) {
StringBuilder sbd = new StringBuilder("熊出没小心");
System.out.println("未添加标点的字符串:" + sbd.toString());
System.out.println("请输入在第几个汉字后加逗号:");
Scanner sc = new Scanner(System.in);
int position = sc.nextInt();
sbd.insert(position, ",");
System.out.println("添加标点后的字符串:" + sbd.toString());
sc.close();
}
}
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