if (result == true) { System.out.println("该字符串是纯数字"); }else{ System.out.println("该字符串不是纯数字"); } } } 方法二:利用Pattern. import java.util.regex.Matcher; import java.util.regex.Pattern; public class Testone { public static void main(String[] args){ String str="123...
⽅法⼀：利⽤正则表达式 public class Testone { public static void main(String[] args){ String str="123456";boolean result=str.matches("[0-9]+");if (result == true) { System.out.println("该字符串是纯数字");}else{ System.out.println("该字符串不是纯数字");} } } ⽅法⼆：...