如何检查字符串中的字符是数字还是字母 [英] How to check if a character in a string is a digit or letter

问题描述

我让用户在程序中输入一个字符，并将其存储为字符串.我想知道如何检查输入的字符是字母还是数字.我有一个if语句，因此，如果它是一个字母，它会打印出它是字母，并且对于数字也是一样.到目前为止，我的代码无法正常工作，但是我觉得我已经接近了.您可以提供的任何帮助都将受到赞赏.

I have the user entering a single character into the program and it is stored as a string. I would like to know how I could check to see if the character that was entered is a letter or a digit. I have an if statement, so if its a letter its prints that it's a letter, and the same for a digit. The code I have so far doesn't work but I feel like I'm close. Any help you can offer is appreciated.

  System.out.println("Please enter a single character: ");
  String character = in.next();

  System.out.println(character);

  if (character.isLetter()){
    System.out.println("The character entered is a letter.");
  }
  else (character.isDigit()){
    Syste.out.println("The character entered is a digit.");

推荐答案

您可以使用:

    if (Character.isLetter(character.charAt(0))){
    ....

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