1 for month is February. The 30th of February is changed to 1st of March.
You should set 0 for month. The best is to use the constant defined in Calendar:


    c1.set(2000, Calendar.JANUARY, 30);



Months in Calendar object start from 0

    0 = January = Calendar.JANUARY
    1 = february = Calendar.FEBRUARY



Selected date at the example is interesting. Example code block is:

    Calendar c1 = GregorianCalendar.getInstance();
    c1.set(2000, 1, 30);  //January 30th 2000
    Date sDate = c1.getTime();

    System.out.println(sDate);

and output `Wed Mar 01 19:32:21 JST 2000`. 

When I first read the example i think that output is wrong but it is true:)

 - `Calendar.Month` is starting from 0 so 1 means February.
 - February last day is 28 so output should be 2 March. 
 - But selected year is important, it is 2000 which means February 29 so result should be 1 March. 

I want to do  a simple str_replace in my twig template. I&#39;m new to twig and probably I need to add new filter or sth like that or to use existing. How can I do this? Where can I find list of filters available?

str_replace in Twig

Is it possible to set the Margins of a LinearLayout, programmatically but not with pixels, but dp?

Margins of a LinearLayout, programmatically with dp

According to doc, calendar set() is:

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html#set%28int,%20int,%20int%29

    set(int year, int month, int date) 
    Sets the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH.

**code:**      

    Calendar c1 = GregorianCalendar.getInstance();
    c1.set(2000, 1, 30);  //January 30th 2000
    Date sDate = c1.getTime();

    System.out.println(sDate);

**output:**

    Wed Mar 01 19:32:21 JST 2000

**Why it&#39;s not Jan 30 ???**


Why Java Calendar set(int year, int month, int date) not returning correct date?

According to doc, calendar set() is:
<a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html#set%28int,%20int,%20int%29" target="_blank" rel="noopener noreferrer">http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Calendar.html#set%28int,%20int,%20int%29</a>
<pre><code class="hljs language-sql">set(int year, int month, int date) 
Sets the values for the calendar fields YEAR, MONTH, and DAY_OF_MONTH.
</code></pre>
code:
<pre><code class="hljs language-ini">Calendar c1 = GregorianCalendar.getInstance();
c1.set(2000, 1, 30); //January 30th 2000
Date sDate = c1.getTime();

System.out.println(sDate);
</code></pre>
output:
<pre><code class="hljs language-yaml">Wed Mar 01 19:32:21 JST 2000
</code></pre>
Why it's not Jan 30 ???

I am using [JSch][1] for sftp communication, now i want to use facilitate the key-based authentication, key is loaded on client and server machine once by my network team and all later communication would be only user based for which we have loaded the key.

    sftp -oPort=10022 jmark@192.18.0.246

as `tjill@192.18.0.135`

like this command work fine and connect to the sftp, how i can achieve this functionality programmatically.

if it is not possible using JSch, please suggest some other library. I came across [Apache SSHD][2].


  [1]: http://www.jcraft.com/jsch/
  [2]: http://mina.apache.org/sshd/

Can we use JSch for SSH key-based communication?

My teacher in an upper level Java class on threading said something that I wasn&#39;t sure of.

He stated that the following code would not necessarily update the `ready` variable.  According to him, the two threads don&#39;t necessarily share the static variable, specifically in the case when each thread (main thread versus `ReaderThread`) is running on its own processor and therefore doesn&#39;t share the same registers/cache/etc and one CPU won&#39;t update the other.

Essentially, he said it is possible that `ready` is updated in the main thread, but NOT in the `ReaderThread`, so that `ReaderThread` will loop infinitely.

He also claimed it was possible for the program to print `0` or `42`.  I understand how `42` could be printed, but not `0`.  He mentioned this would be the case when the `number` variable is set to the default value.

I thought perhaps it is not guaranteed that the static variable is updated between the threads, but this strikes me as very odd for Java.  Does making `ready` volatile correct this problem?

He showed this code:  

    public class NoVisibility {  
        private static boolean ready;  
        private static int number;  
        private static class ReaderThread extends Thread {   
            public void run() {  
                while (!ready)   Thread.yield();  
                System.out.println(number);  
            }  
        }  
        public static void main(String[] args) {  
            new ReaderThread().start();  
            number = 42;  
            ready = true;  
        }  
    }


Are static variables shared between threads?

Here&#39;s my problem - I&#39;m looking for (if it even exists) the enum equivalent of `ArrayList.contains();`.

Here&#39;s a sample of my code problem:

    enum choices {a1, a2, b1, b2};

    if(choices.???(a1)}{
    //do this
    } 

Now, I realize that an `ArrayList` of `Strings` would be the better route here but I have to run my enum contents through a switch/case elsewhere. Hence my problem.

Assuming something like this doesn&#39;t exist, how could I go about doing it?


Java: Check if enum contains a given string?

So I have a double set to equal 1234, I want to move a decimal place over to make it 12.34

So to do this I multiply .1 to 1234 two times, kinda like this

    double x = 1234;
    for(int i=1;i&lt;=2;i++)
    {
      x = x*.1;
    }
    System.out.println(x);

This will print the result, &quot;12.340000000000002&quot;

Is there a way, without simply formatting it to two decimal places, to have the double store 12.34 correctly?


Moving decimal places over in a double

Our standard code section for using JDBC is...

    Connection conn = getConnection(...);
    Statement  stmt = conn.conn.createStatement (ResultSet.TYPE_SCROLL_INSENSITIVE,
                                                    ResultSet.CONCUR_READ_ONLY);
    ResultSet  rset = stmt.executeQuery (sqlQuery);
    
    // do stuff with rset
    
    rset.close(); stmt.close(); conn.close();

**Question 1:** When using Connection Pool, should one close the Connection at the end? If so, isn&#39;t the purpose of pooling lost? And if not, how does the DataSource know when a particular instance of Connection is freed up and can be reused? I am a little confused on this one, any pointers appreciated.

**Question 2:** Is the following method anything close to standard? Looks like an attempt to get a connection from the pool, and if DataSource cannot be established, use the old fashioned DriverManager. We are not even sure which part is getting executed at runtime.
Repeating the question above, should one close the Connection coming out of such a method?

    synchronized public Connection getConnection (boolean pooledConnection)
                                                            throws SQLException {
            if (pooledConnection) {
                    if (ds == null) {
                            try {
                                    Context envCtx = (Context)
                                            new InitialContext().lookup(&quot;java:comp/env&quot;);
                                    ds = (DataSource) envCtx.lookup(&quot;jdbc/NamedInTomcat&quot;);
                                    return ds.getConnection();
                            } catch (NamingException e) {
                                    e.printStackTrace();
                    }}
                    return (ds == null) ? getConnection (false) : ds.getConnection();
            }
            return DriverManager.getConnection(
                    &quot;jdbc:mysql://&quot;+ipaddy+&quot;:&quot;+dbPort +&quot;/&quot; + dbName, uName, pWord);
    }

 Edit: I think we are getting the pooled connection since we do not see a stack trace.
 

Closing JDBC Connections in Pool

I created a `Date` object in Java. When I do so, it shows something like: `date=Tue Aug 09 00:00:00 IST 2011`. As a result, it appears that my Excel file is lesser by one day (27 feb becomes 26 feb and so on) I think it must be because of time. How can I set it to something like 5:30 pm?

How to set time to a date object in java

I am building a custom events system, and if you have a repeating event that looks like this:

Event A repeats every 4 days starting on March 3, 2011

or 

Event B repeats every 2 weeks on Tuesday starting on March 1, 2011

How can I store that in a Database in a way that would make it simple to lookup. I don&#39;t want performance issues if there are a large number of events, and I have to go through each and every one when rendering the calendar.

Calendar Recurring/Repeating Events - Best Storage Method

I am new to Java, usually work with PHP.

I am trying to convert this string:

&gt; Mon Mar 14 16:02:37 GMT 2011

Into a Calendar Object so that I can easily pull the Year and Month like this:

	String yearAndMonth = cal.get(Calendar.YEAR)+cal.get(Calendar.MONTH);

Would it be a bad idea to parse it manually? Using a substring method?

Any advice would help thanks!



Convert String to Calendar Object in Java

I&#39;ve got GregorianCalendar instances and need to use SimpleDateFormat (or maybe something that can be used with calendar but that provides required #fromat() feature) to get needed output. Please, suggest work arounds as good as permanent solutions. 

How can I utilize SimpleDateFormat with Calendar?

I&#39;m working for this nightclub and are currently making a website for them, they&#39;ve got lots events and their site is built a lot around events, today they make an facebook event of every event but it would be killer to have a &quot;Add to my Calendar&quot; button which added it to your iCal or Google Calendar (or maybe even Outlook).

I&#39;ve managed to figure out how to make an calendar feed but then it will be added as a new calendar, only good thing is that people can &quot;subscribe to events&quot; but it&#39;s quite messy to have an calendar for every event. So I would like to know how to implement a function which lets them add it to their main calendar easily. Think like a mailto: link but for calendars if that&#39;s possible.

Also while I&#39;m on the subject, does anyone know if it&#39;s possible to automatically import an event from Facebook to WordPress or export an event from WordPress to Facebook that would be great, but that&#39;s not so important.

Content Type	Original Author	Original Content on Stackoverflow
Question	Meow	View Question on Stackoverflow
Solution 1 - Java	Benoit Thiery	View Answer on Stackoverflow
Solution 2 - Java	fmucar	View Answer on Stackoverflow
Solution 3 - Java	erhun	View Answer on Stackoverflow

Why Java Calendar set(int year, int month, int date) not returning correct date?

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Margins of a LinearLayout, programmatically with dp

str_replace in Twig

Attributions