java - 如何打印非0的整数？

Question

为我的 java 类编写代码，程序按预期运行，我遇到的唯一问题是州际公路是否为 405，当它打印时，它会打印 05 标记问题错误，因为问题只是寻找 5 。有什么帮助吗？

import java.util.Scanner; 

      highwayNumber = scnr.nextInt();

      if ((highwayNumber > 999) || (highwayNumber < 1)) {
         System.out.println(highwayNumber + " is not a valid interstate highway number.");
      }
      else if ((highwayNumber < 100) && (highwayNumber > 0) && (highwayNumber % 2 == 0)) {
         System.out.println("The " + highwayNumber + " is primary, going east/west.");
      }
      else if ((highwayNumber < 100) && (highwayNumber > 0) && (highwayNumber % 2 != 0)) {
         System.out.println("The " + highwayNumber + " is primary, going north/south.");
      }
      else if ((highwayNumber > 99) && (highwayNumber < 1000) && (highwayNumber % 2 == 0)) {
         System.out.println("The " + highwayNumber + " is auxiliary, serving the " + String.valueOf(highwayNumber).substring(1) + ", going east/west.");
      }
      else if ((highwayNumber > 99) && (highwayNumber < 1000) && (highwayNumber % 2 != 0)) {
         System.out.println("The " + highwayNumber + " is auxiliary, serving the " + String.valueOf(highwayNumber).substring(1) + ", going north/south.");
      }
   }
}

Answer 1

只需将 substring 替换为 % 模运算符:

System.out.println("The " + highwayNumber + " is auxiliary, serving the " + String.valueOf(highwayNumber % 100) + ", going east/west.");

System.out.println("The " + highwayNumber + " is auxiliary, serving the " + String.valueOf(highwayNumber % 100) + ", going north/south.");