不使用.split命令分割字符串

Question

I got a String "1/3" where I want to get only the number 1

Is it possible to get it without using "1/3".split("\\\\/") ?

Answer 1

you can use indexOf() and subString() to get 1

String str = "1/3";
System.out.println(str.substring(0, str.indexOf("/")));  

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Answer 2

阅读String API：

String.substring(...);

Answer 3

Or with some regex as well:

String s = "1/3";
String m = s.replaceAll("(\\d+)/.+", "$1");