确定字符的类型

/** nowjava - 时代Java 提供 **/


public class Main {

  public void m() throws Exception {

    char ch = 'a';

    if (Character.isLetter(ch)) { // true

    }

    if (Character.isDigit(ch)) { // false

    }

    if (Character.isLowerCase(ch)) { // true

    }

    if (Character.isUpperCase(ch)) { // false

    }

    // See Character for more methods.

  }

}