Question

我理解 Java的定期表述可从<代码>String smatches益准方法上查阅,也可从长途经上传到<代码>Pattern等。因此,以下代码应实际印成“Y>项目”。它印刷了“Y”、“Y”、“无”线。我失踪了什么?

import java.util.regex.*;

public class TestRegex {
public static void main(String[] args) {
    String pattern = "html";
    String input   = "somehtml.txt";

    Pattern p = Pattern.compile(pattern);
    Matcher m = p.matcher(input);

    if(m.find()) {
        System.out.println("Yes!");
    }
    else {
        System.out.println("no");
    }

    if(input.matches(pattern)) {
        System.out.println("Yes!");
    }
    else {
        System.out.println("no");
    }

}

}

产出:

Yes!
no

Java edition 1.6 on Win7 64-bit.

C:UsersMichael Smith>java -version java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)

Answer 1

http://www.un.org/Depts/DGACM/index_french.htmfind ( only look for a line some where in the string.

Answer 2

String#Matches method checks the pattern against the entire input text. This is the reason your code prints no second time. Matcher#Find scans input to find next matching subsequence in the input.

友情链接