大约有 45,000 项符合查询结果（耗时：0.0638秒） [XML]
Java generics type erasure: when and what happens?
... into compile-time checks and execution-time casts. So this code:
List<String> list = new ArrayList<String>();
list.add("Hi");
String x = list.get(0);
is compiled into
List list = new ArrayList();
list.add("Hi");
String x = (String) list.get(0);
At execution time there's no way of ...
Extract numbers from a string
I want to extract the numbers from a string that contains numbers and letters like:
20 Answers
...
Why does Date.parse give incorrect results?
...t, the Date.parse method was completely implementation dependent (new Date(string) is equivalent to Date.parse(string) except the latter returns a number rather than a Date). In the 5th edition spec the requirement was added to support a simplified (and slightly incorrect) ISO-8601 (also see What ar...
How to dump a table to console?
... It returns a function that transforms any Lua value into a human-readable string:
local inspect = require('inspect')
print(inspect({1,2,3})) -- {1, 2, 3}
print(inspect({a=1,b=2})
-- {
-- a = 1
-- b = 2
-- }
It indents subtables properly, and handles "recursive tables" (tables that contain r...
How can I count occurrences with groupBy?
...il.*;
import java.util.stream.*;
class Test {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add("Hello");
list.add("Hello");
list.add("World");
Map<String, Long> counted = list.stream()
...
How do I remove duplicates from a C# array?
I have been working with a string[] array in C# that gets returned from a function call. I could possibly cast to a Generic collection, but I was wondering if there was a better way to do it, possibly by using a temp array.
...
Java String array: is there a size of method?
...
Yes, .length (property-like, not a method):
String[] array = new String[10];
int size = array.length;
share
|
improve this answer
|
follow
...
Replace string within file contents
...
If you'd like to replace the strings in the same file, you probably have to read its contents into a local variable, close it, and re-open it for writing:
I am using the with statement in this example, which closes the file after the with block is termi...
Regex for numbers only
...ficulty troubleshooting. I want the regex to match only when the contained string is all numbers; but with the two examples below it is matching a string that contains all numbers plus an equals sign like "1234=4321". I'm sure there's a way to change this behavior, but as I said, I've never really d...
Get domain name from given url
...blem. Just get in the habit of using java.net.URI instead.
public static String getDomainName(String url) throws URISyntaxException {
URI uri = new URI(url);
String domain = uri.getHost();
return domain.startsWith("www.") ? domain.substring(4) : domain;
}
should do what you want.
...