Java CompareTo没有返回好的结果

Question

I've implemented a function to check if one url is newer that the other one, in order to go through whole website ex: page1, page2, page3.

But when i'm using compareTo function in Java it doesn't return good result in some case check it out and Please help!

String someString1 = "http://view-inventory.aspx?_page=9";
String someString2 = "http://view-inventory.aspx?_page=11";

int comparisonResult = someString2.compareTo(someString1);

System.out.println("Comparison result:"+comparisonResult);


if(comparisonResult==0){
    System.out.println("We're equal");
}
else if(comparisonResult>0){
    System.out.println("Some one is bigger");
}
else {
    System.out.println("Some one is smaller");
}

when i compare page=8 and page=9 it works fine but for example above(page=9 and page=10) it doesn't work :(

Answer 1

That is because 1 (the first digit of 11 ) is smaller than 9 . If you use 09 and 11 it will work. In order to make it work, extract the number and compare the number by comparing integers, instead of characters.

Answer 2

That is because 9 is bigger than 1.

You need to substring the part after "=" and cast it to int, then compare.

Answer 3

Simple stuff. 9 > 1. Parse the URL until =. Cast that char to Int. Then, do the same thing. you'd get your desired output!