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How do you return a JSON object from a Java Servlet
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First convert the JSON object to String. Then just write it out to the response writer along with content type of application/json and character encoding of UTF-8.
Here's an example assuming you're using Google Gson to convert a Java object to a JSON string:
protect...
How to print a float with 2 decimal places in Java?
...vin, if if enter 10.0000, i am getting 10 only. If i want to display 10.00 then how can i do?
– Mdhar9e
Aug 26 '14 at 12:26
2
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Dropping Unique constraint from MySQL table
...dex is stored in the column called key_name in the results of that query.
Then you can use DROP INDEX:
DROP INDEX index_name ON tbl_name
or the ALTER TABLE syntax:
ALTER TABLE tbl_name DROP INDEX index_name
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Can I grep only the first n lines of a file?
... grep ...
head will output the first 10 lines (using the -n option), and then you can pipe that output to grep.
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How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
...s no built-in reverse indexof, I reverse the array, filter out duplicates, then re-reverse it.
The filter function looks for any occurence of the element after the current index (before in the original array). If one is found, it throws out this element.
Edit:
Alternatively, you could use lastind...
Is floating point math broken?
...tively, i.e. some number of bits of the quotient are calculated each step, then the result is subtracted from the dividend, and the divider repeats the steps until the error is less than one half of one unit in the last place. Slow division methods calculate a fixed number of digits of the quotient ...
C# 4 default parameter values: How to assign a default DateTime/object value? [duplicate]
...ult value of null, and if it is set to null at the start of your function, then you can initialize it to any value you want.
static void test(DateTime? dt = null)
{
if (dt == null)
{
dt = new DateTime(1981, 03, 01);
}
//...
}
You can call it with a named parameter like th...
How can I view array structure in JavaScript with alert()?
...nction() {
return " (" + this.x + "," + this.y + ") ";
};
}
Then if you have an array of points:
var MyArray = [];
MyArray.push ( new Point(5,6) );
MyArray.push ( new Point(7,9) );
You can print simply calling:
alert(MyArray);
Hope this helps!
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How do I escape a single quote ( ' ) in JavaScript? [duplicate]
...lert('hello')' > is not working but if i change it to "alert('hello')" then it does why so?
– Suraj Jain
Jan 22 '17 at 7:42
3
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What's the best way to communicate between view controllers?
...several books are listed. The user can pick books he/she wants to buy, and then tap a "checkout" button to go to the checkout screen.
To build this, you might create a BookPickerViewController class that controlls and displays the GUI/view objects. Where will it get all the book data? Let's say it...