`java.exe` is the console app while `javaw.exe` is windows app (console-less). You can&#39;t have [`Console`][1] with `javaw.exe`. 


  [1]: http://java.sun.com/javase/6/docs/api/java/io/Console.html

java.exe is the command where it waits for application to complete untill it takes the next command.
javaw.exe is the command which will not wait for the application to complete. you can go ahead with another commands.

The difference is in the [subsystem][1] that each executable targets.

 - `java.exe` targets the `CONSOLE` subsystem.
 - `javaw.exe` targets the `WINDOWS` subsystem.



  [1]: http://msdn.microsoft.com/en-us/library/fcc1zstk.aspx

The javaw.exe command is identical to java.exe, except that with javaw.exe there is no associated console window

I have a bash script like:

    #!/bin/bash
    
    echo Hello world!

How do I execute this in Terminal?

How do I execute a bash script in Terminal?

I need to do some experiment and I need to know some kind of unique identifier for objects in javascript, so I can see if they are the same. I don&#39;t want to use equality operators, I need something like the id() function in python. 

Does something like this exist ?


unique object identifier in javascript

Recently I noted that some applications are running on `javaw` (not in `java`). What is the difference between them and how can I run my Swing application on `javaw`?

Difference between java.exe and javaw.exe

<p>Recently I noted that some applications are running on <code>javaw</code> (not in <code>java</code>). What is the difference between them and how can I run my Swing application on <code>javaw</code>?</p>


Why is it not legal to have the following two methods in the same class?

    class Test{
       void add(Set&lt;Integer&gt; ii){}
       void add(Set&lt;String&gt; ss){}
    }

I get the `compilation error` 

&gt;Method add(Set&lt;Integer&gt;) has the same erasure add(Set&lt;E&gt;) as another method in type Test.

while I can work around it, I was wondering why javac doesn&#39;t like this.

I can see that in many cases, the logic of those two methods would be very similar and could be replaced by a single 

    public void add(Set&lt;?&gt; set){}

method, but this is not always the case.

This is extra annoying if you want to have two `constructors` that takes those arguments because then you can&#39;t just change the name of one of the `constructors`.

Method has the same erasure as another method in type

I have an action class that generates a PDF. The `contentType` is set appropriately.

    public class MyAction extends ActionSupport 
    {
       public String execute() {
        ...
        ...
        File report = signedPdfExporter.generateReport(xyzData, props);

        inputStream = new FileInputStream(report);
        contentDisposition = &quot;attachment=\&quot;&quot; + report.getName() + &quot;\&quot;&quot;;
        contentType = &quot;application/pdf&quot;;
        return SUCCESS;
       }
    }

I call this `action`  through an Ajax call. I don&#39;t know the way to deliver this stream to browser. I tried a few things but nothing worked.

    $.ajax({
        type: &quot;POST&quot;,
        url: url,
        data: wireIdList,
        cache: false,
        success: function(response)
        {
            alert(&#39;got response&#39;);
            window.open(response);
        },
        error: function (XMLHttpRequest, textStatus, errorThrown) 
        {
            alert(&#39;Error occurred while opening fax template&#39; 
                  + getAjaxErrorString(textStatus, errorThrown));
        }
    });

The above gives the error:

&gt; Your browser sent a request that this server could not understand.

Download and open PDF file using Ajax

I have tomcat 5.5 installed, running and verifiable at http://localhost:8080/. The Tomcat menu option appears in the Eclipse menu bar and I can start and stop Tomcat from there. In Eclipse, it does not show as a Server Runtime Environment in Window - Preferences - Server - Runtime Environments, nor does it appear in the list of environments that can be added when I click the &quot;Add&quot; button. All I see is the J2EE Runtime Library.

Edit:  
Running on Windows XP.

Eclipse version is 3.5.1


Apache Tomcat Not Showing in Eclipse Server Runtime Environments

On pressing the back button, I&#39;d like my application to go into the stopped state, rather than the destroyed state.

In the Android [docs][1] it states:

&gt;...not all activities have the behavior that they are destroyed when BACK is pressed. When the user starts playing music in the Music application and then presses BACK, the application overrides the normal back behavior, preventing the player activity from being destroyed, and continues playing music, even though its activity is no longer visible

**How do I replicate this functionality in my own application?**

I think there must be three possibilities...

1. Capture the back button press (as below) and then call whatever method(s) the home button calls.  

        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            if ((keyCode == KeyEvent.KEYCODE_BACK)) {
                Log.d(this.getClass().getName(), &quot;back button pressed&quot;);
            }
            return super.onKeyDown(keyCode, event);
        }

2. Capture the back button press and then spoof a home button press.  

3. Capture the back button press, then start an Activity of the home screen, effectively putting my application&#39;s Activity into the stopped state.

**Edit:**
I know about services and am using one in the application to which this problem is related. This question is specifically about putting the Activity into the stopped state rather than the destroyed state on pressing the back button.


  [1]: http://developer.android.com/intl/fr/guide/practices/ui_guidelines/activity_task_design.html

Override back button to act like home button

As succinctly described [here](http://www.linuxtopia.org/online_books/programming_books/thinking_in_java/TIJ309_006.htm), overriding private methods in Java is invalid because a parent class&#39;s private methods are &quot;automatically final, and hidden from the derived class&quot;.  My question is largely academic.

How is it *not* a violation of encapsulation to not allow a parent&#39;s private method to be &quot;overridden&quot; (ie, implemented independently, with the same signature, in a child class)?  A parent&#39;s private method cannot be accessed or inherited by a child class, in line with principles of encapsulation.  It is hidden.

So, why should the child class be restricted from implementing its own method with the same name/signature?  Is there a good theoretical foundation for this, or is this just a pragmatic solution of some sort?  Do other languages (C++ or C#) have different rules on this?


Overriding private methods in Java

&gt; **Possible Duplicate:**  
&gt; [Multiline text in JLabel](https://stackoverflow.com/questions/685521/multiline-text-in-jlabel)  

&lt;!-- End of automatically inserted text --&gt;

I want to do this:

    JLabel myLabel = new JLabel();
    myLabel.setText(&quot;This is\na multi-line string&quot;);

Currently this results in a label that displays

    This isa multi-line string

I want it to do this instead:

    This is
    a multi-line string

Any suggestions?

Thank you

----

EDIT: Implemented solution

In body of method:

    myLabel.setText(convertToMultiline(&quot;This is\na multi-line string&quot;));
    
Helper method:

    public static String convertToMultiline(String orig)
    {
        return &quot;&lt;html&gt;&quot; + orig.replaceAll(&quot;\n&quot;, &quot;&lt;br&gt;&quot;);
    }

Java swing: Multiline labels?

I&#39;m a web developer at day and thinking about building my first real desktop application. The idea is to build a tool that automates a very repetitive task in a web application where no API is available.

I know I want to use Java. I used it before for web stuff, know the syntax pretty well  and want the application to be cross plattform as easy as possible. 

Where I&#39;m not so sure is if I should use SWT or Swing. As my main audience uses Windows, I want to look it as native as possible there. Linux and Mac should work, but the looks are not so important here.

So what are the arguments for and against each UI Framework, Swing or SWT?

Thanks.

PS: I develop on Windows using Eclipse. But was thinking about playing with Netbeans.



Java Desktop application: SWT vs. Swing

I have the following code to instantiate a JTable: the table comes up with the right number of rows and columns, but there is no sign of the titles atop the columns. 

    public Panel1()
    {
    	int  nmbrRows;

        setLayout(null);
        setBackground(Color.magenta);
        Vector colHdrs;

        //create column headers

        colHdrs = new Vector(10);
        colHdrs.addElement(new String(&quot;Ticker&quot;));

	    // more statements like the above to establish all col. titles       

        nmbrRows = 25;
        DefaultTableModel tblModel = new DefaultTableModel(nmbrRows, colHdrs.size());
        tblModel.setColumnIdentifiers(colHdrs);

        scrTbl = new JTable(tblModel);
        scrTbl.setBounds(25, 50, 950, 600);
        scrTbl.setBackground(Color.gray);
        scrTbl.setRowHeight(23);    
        add(scrTbl);
	
	//rest of constructor
	...

    }

Comparing this to other table-making code, I don&#39;t see any missing steps, but something must be absent.

JTable won&#39;t show column headers

In my `JPanel`, I set the background of a `JLabel` to a different color. I can see the word &quot;Test&quot; and it&#39;s blue, but the background doesn&#39;t change at all. How can I get it to show?

    this.setBackground(Color.white);
    JLabel label = new JLabel(&quot;Test&quot;);
    label.setForeground(Color.blue);
    label.setBackground(Color.lightGray);
    this.add(label);


How do I set a JLabel&#39;s background color?

I have a JLabel which has a lot of text on it. Is there a way to make the JLabel have a max width so that it will wrap the text to make it not exceed this width?

Thanks

make a JLabel wrap it&#39;s text by setting a max width

I am trying to use this GUI mod for a Minecraft Server. I wrote a batch file so the server can start with more RAM. When I run just the .jar file, no command window opens and it runs just fine (of course with about 256mb ram) I was reading online that javaw starts a jar file without a command-line-console. But when I use javaw, the command console opens, but when I close it the program remains open. this is my batch file:

    @echo off 
    &quot;%ProgramFiles(x86)%\Java\jre6\bin\javaw.exe&quot; -jar -Xms1024m -Xmx1024m crafty.jar 
    @echo on

I don&#39;t understand java as well as most, so please try to be as clear as possible. Thanks


Start a java program without the console

What is the difference between `java`, `javaw`, and `javaws`?

I have found that on Windows most usage of Java is done using `javaw`.





Content Type	Original Author	Original Content on Stackoverflow
Question	asela38	View Question on Stackoverflow
Solution 1 - Java	Chandra Patni	View Answer on Stackoverflow
Solution 2 - Java	GuruKulki	View Answer on Stackoverflow
Solution 3 - Java	David Heffernan	View Answer on Stackoverflow
Solution 4 - Java	Chathuranga Chandrasekara	View Answer on Stackoverflow

Difference between java.exe and javaw.exe

Java Problem Overview

Java Solutions

Solution 1 - Java

Solution 2 - Java

Solution 3 - Java

Solution 4 - Java

unique object identifier in javascript

How do I execute a bash script in Terminal?

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