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Overloading and overriding
... at run time.
class Car
{
public int topSpeed()
{
return 200;
}
}
class Ferrari extends Car
{
public int topSpeed()
{
return 400;
}
public static void main(String args[])
{
Car car = new Ferrari();
int num= car.topSpeed();
Sys...
How to make an image center (vertically & horizontally) inside a bigger div [duplicate]
I have a div 200 x 200 px. I want to place a 50 x 50 px image right in the middle of the div.
36 Answers
...
Sending a JSON to server and retrieving a JSON in return, without JQuery
...nge = function () {
if (xhr.readyState === 4 && xhr.status === 200) {
var json = JSON.parse(xhr.responseText);
console.log(json.email + ", " + json.password);
}
};
var data = JSON.stringify({"email": "hey@mail.com", "password": "101010"});
xhr.send(data);
Sending an...
How do I scale a stubborn SVG embedded with the tag?
...
None of the answers given here worked for me when I asked this back in 2009. As I now had the same issue again I noticed that using the <img> tag and width together with an svg works fine.
<img width="400" src="image.svg">
...
Plot correlation matrix into a graph
..."AOE", col=col1(10),addCoef.col="grey")
corrplot(M, order="AOE", col=col2(200))
corrplot(M, order="AOE", col=col2(200),addCoef.col="grey")
corrplot(M, order="AOE", col=col2(20), cl.length=21,addCoef.col="grey")
corrplot(M, order="AOE", col=col2(10),addCoef.col="grey")
corrplot(M, order="AOE", col=...
How to use C++ in Go
In the new Go language, how do I call C++ code? In other words, how can I wrap my C++ classes and use them in Go?
12 Answ...
Python Flask, how to set content type
...
As simple as this
x = "some data you want to return"
return x, 200, {'Content-Type': 'text/css; charset=utf-8'}
Hope it helps
Update:
Use this method because it will work with both python 2.x and python 3.x
and secondly it also eliminates multiple header problem.
from flask import R...
C++ performance vs. Java/C#
My understanding is that C/C++ produces native code to run on a particular machine architecture. Conversely, languages like Java and C# run on top of a virtual machine which abstracts away the native architecture. Logically it would seem impossible for Java or C# to match the speed of C++ because ...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...
#!/bin/bash
(
# Wait for lock on /var/lock/.myscript.exclusivelock (fd 200) for 10 seconds
flock -x -w 10 200 || exit 1
# Do stuff
) 200>/var/lock/.myscript.exclusivelock
This ensures that code between ( and ) is run only by one process at a time and that the process doesn’t wait to...
How do you loop in a Windows batch file?
...
If you want to do something x times, you can do this:
Example (x = 200):
FOR /L %%A IN (1,1,200) DO (
ECHO %%A
)
1,1,200 means:
Start = 1
Increment per step = 1
End = 200
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