java不断改变第一个邮政编码

Question

我不明白为什么当我编译这段代码时我得到了不正确的邮政编码。

John Smith
486 test St.
Yahoo, MA 898 - 2597JohnSmith
486 test St.
Yahoo, MA 898  2597

代码

public class test
{
  public static void main(String[] args) {

      String firstName = "John";
      String lastName = "Smith";
      int streetNumber = 486;
      String streetName = "test St.";
      String city = "Yahoo";
      String state = "MA";
      int zip =  01602;
      int zipplus4 = 2597;


     System.out.print(firstName + " " + lastName + "\n" + streetNumber + " " + streetName + "\n" + city + ", " + state + " " + zip + " - " + zipplus4);

     System.out.println(firstName + lastName);
     System.out.println(streetNumber + " " + streetName);  
     System.out.println(city + ", " + state + " " + zip + " - " + zipplus4);  

    }

    }

Answer 1

当您指定一个带有前导零的数字时，它将被视为八进制(以 8 为基数，而不是以 10 为基数的十进制或以 16 为基数的十六进制)。

01602 octal == 898 decimal

由于 Java 在设计时并未考虑到邮政编码，因此要获得所需的效果，请删除前导零，并在打印时对其进行格式化:

System.out.println(city + ", " + state + " " + new java.text.NumberFormat("00000").format(zip) + " - " + new java.text.NumberFormat("0000").format(zipplus4));