java - charAt 无法在 Java 分数计算器中工作

Question

即使输入有下划线，此代码也会返回 false。 输入类似于 1_3/4 + 3 并返回 4_3/4

  String[] Separated = fraction.split(" "); //Splits the tokens up
  String firstToken = Separated[0]; // I created this to try to troubleshoot
  boolean Mixed = true; //This would determine how much I will need to split up
  for(int i = 0; i < firstToken.length(); i++) {
     if(firstToken.charAt(i) == '_') { 
        Mixed = true;
     }
     else {
        Mixed = false;
     }
  }

Answer 1

您可以使用“contains”代替 for 循环:

boolean mixed = firstToken.contains("_");

请在java中使用小写变量名。