(转)有意思的------java.net.URL

What do you think the output for lines 3 and 5 will be?

HashSet set = new HashSet();
set.add(new URL("http://google.com"));
set.contains(new URL("http://google.com"));
Thread.sleep(60000);
set.contains(new URL("http://google.com"));

 

很有意思！！

 

预知why，请看这篇文章：http://mishadoff.github.io/blog/java-magic-part-1-java-dot-net-dot-url/

评论

2 楼 smallbee 2013-09-13  

true
true

1 楼 leonayx123 2013-09-13  

protected boolean equals(URL u1, URL u2) {
        String ref1 = u1.getRef();
        String ref2 = u2.getRef();
        return (ref1 == ref2 || (ref1 != null && ref1.equals(ref2))) &&
               sameFile(u1, u2);
}