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How to round a number to n decimal places in Java
...ormat("#.####");
df.setRoundingMode(RoundingMode.CEILING);
for (Number n : Arrays.asList(12, 123.12345, 0.23, 0.1, 2341234.212431324)) {
Double d = n.doubleValue();
System.out.println(df.format(d));
}
gives the output:
12
123.1235
0.23
0.1
2341234.2125
EDIT: The original answer does n...
json.dumps vs flask.jsonify
...client. While for smaller dictionaries, the response works fine, for large arrays I get a content length mismatched error on the browser. Any ideas as to why this happens? there's a limit to how much data I can send?
– sakib11
Aug 10 at 10:47
...
C#: Looping through lines of multiline string
...g without using much more memory (for example without splitting it into an array)?
7 Answers
...
Never seen before C++ for loop
...for size() and back().
What it does is reverses the list and stores in an array.
But in C# we directly have system defined function for this. So you don't need to write this loop also.
b = b.Reverse().ToArray();
share
...
Benefit of using Parcelable instead of serializing object
...n {
return input.readLong();
}
public final long[] readLongArray() throws IOException {
int c = input.readInt();
if (c == -1) {
return null;
}
long[] a = new long[c];
for (int i=0 ; i<c ; i++) {
a[i] = input.readLong(...
What is the difference between a static and a non-static initialization code block
... bark! where is example?
package com.example.learnjava;
import java.util.ArrayList;
public class Fruit {
static {
System.out.println("Inside Static Initializer.");
// fruits array
ArrayList<String> fruits = new ArrayList<>();
fruits.add("Apple");
...
Fast way to get image dimensions (not filesize)
...
I see you're using arrays for arguments as a hack to get ref/out parameters in Java - is that considered best-practice?
– Dai
Oct 16 '17 at 17:50
...
Get query from java.sql.PreparedStatement [duplicate]
....Reader;
import java.math.BigDecimal;
import java.net.URL;
import java.sql.Array;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.Date;
import java.sql.NClob;
import java.sql.ParameterMetaData;
import java.sql.PreparedStatement;
import java.sql.Ref;
import jav...
Using PHP with Socket.io
...end(
ElephantIOClient::TYPE_EVENT,
null,
null,
json_encode(array('name' => 'foo', 'args' => 'bar'))
);
$elephant->close();
echo 'tryin to send `bar` to the event `foo`';
socket io server
var io = require('socket.io').listen(8000);
io.sockets.on('connection', function (s...
Validate uniqueness of multiple columns
...r the validation on multiple columns is similar, but you should provide an array of fields instead:
validates :attr, uniqueness: {scope: [:attr1, ... , :attrn]}
However, validation approaches shown above have a race condition and can’t ensure consistency. Consider the following example:
dat...