多个分支if else语句

Question

我试图将单个字符标识为大写或小写字母。我对if else语句的逻辑有困难。任何帮助将非常感激。当它运行时，它现在将打印它是大写还是小写。

String x = "";

if (Character.isLetter(x)) {
       System.out.println(x + " is a letter.");
   }
   else if (Character.isUpperCase(x)) {
       System.out.println(x + " is upper case.");
   }
   else if (Character.isLowerCase(x)) {
       System.out.println(x + " is lower case.");
   }

Answer 1

试试这个......

if (Character.isLetter(x)) {
   System.out.println(x + " is a letter.");
   if (Character.isUpperCase(x)) {
      System.out.println(x + " is upper case.");
   }
   else if (Character.isLowerCase(x)) {
      System.out.println(x + " is lower case.");
   }
}