//把123456789分割成123,456,789,
public class A
{
public static void main(String[] args)
{
String str = "123456789";//如果123456789是数字类型,则可以将其转换为String类型
String str1 = "";
for(int i=0;i<9;i++){
str1 += str.charAt(i);
if((i+1)%3 == 0){
str1 += ";";
}
}
System.out.println(str1);
}
}
追问那我要是随便输入九位数字呢
追答import java.util.regex.Matcher;
import java.util.regex.Pattern;
public abstract class TestString {
public static void main(String[] args) {
String s = "xinwen32";
StringBuffer sbuffer = new StringBuffer();
StringBuffer nbuffer = new StringBuffer();
try {
Pattern pattern = Pattern.compile("[0-9]");// [A-Z]");
Matcher m = pattern.matcher(s);
System.out.println(m.toString() + "--");
char[] chars = s.toCharArray();
String str = null;
for (char c : chars) {
str = String.valueOf(c);
m = pattern.matcher(str);
if (m.matches()) {
nbuffer.append(str);
} else {
sbuffer.append(str);
}
}
System.out.println(s + "---getStr---" + sbuffer.toString() + "--getNum---" + nbuffer);
} catch (Exception ioEx) {
ioEx.printStackTrace();
}
}
}
追问😱👏
看不懂……
追答需要用到正则表达式