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Group a list of objects by an attribute : Java
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In Java 8:
Map<String, List<Student>> studlistGrouped =
studlist.stream().collect(Collectors.groupingBy(w -> w.stud_location));
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Including an anchor tag in an ASP.NET MVC Html.ActionLink
... object with a custom method which includes a simple way to add a fragment string.
– LorenzCK
Feb 3 '12 at 14:03
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Convert System.Drawing.Color to RGB and Hex Value
... Color is a struct and R, G, and B are bytes, so c can't be null and c.R.ToString(), c.G.ToString(), and c.B.ToString() can't actually fail (the only way I can see them failing is with a NullReferenceException, and none of them can actually be null).
You could clean the whole thing up using the fol...
Reading a plain text file in Java
...ad this wonderful (yet free) book called Thinking In Java
In Java 7:
new String(Files.readAllBytes(...))
(docs)
or
Files.readAllLines(...)
(docs)
In Java 8:
Files.lines(..).forEach(...)
(docs)
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Xcode duplicate line
...ey> <dict> <key>Duplicate Current Line</key> <string>selectLine:, copy:, moveToEndOfLine:, insertNewline:, paste:, deleteBackward:</string> </dict>
– Vlad Tsepelev
Jun 8 '12 at 12:04
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How can I convert JSON to a HashMap using Gson?
...rt com.google.gson.reflect.TypeToken;
Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> myMap = gson.fromJson("{'k1':'apple','k2':'orange'}", type);
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New features in java 7
.../ code
}
Underscores in numeric literals
int one_million = 1_000_000;
Strings in switch
String s = ...
switch(s) {
case "quux":
processQuux(s);
// fall-through
case "foo":
case "bar":
processFooOrBar(s);
break;
case "baz":
processBaz(s);
// fall-through
def...
Reverse a string in Java
I have "Hello World" kept in a String variable named hi .
45 Answers
45
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Split Java String by New Line
I'm trying to split text in a JTextArea using a regex to split the String by \n However, this does not work and I also tried by \r\n|\r|n and many other combination of regexes.
Code:
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How to remove all leading zeroes in a string
If I have a string
10 Answers
10
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