Why do I have to use -d to compile?

[cybermilky]

Here I have a file named Hello1.java but when i compile it, it generates a message. So, I compile it again with -d.

javac -d Hello1.java

Why do i have to use '-d'?
Is there any other ways to compile the file?

-------------Hello1.java-------------
import java.awt.Frame;
import java.awt.FlowLayout;
import java.awt.Label;

public class Hello1 extends Frame
{
private String message = "";
private Label messageLabel = new Label("Message Text");

public static void main(String args[])
{
Hello1 me = new Hello1("Hello World");
me.printMessage(args[0]);
}

public Hello1(String message)
{
this.message = message;

setLayout(new FlowLayout());
add(messageLabel);
resize (200, 50);
show();
}

private void printMessage(String messageType)
{
GeneralMessagePrinter newPrinter = null;

if (messageType.equals("l"))
newPrinter = new LowerCaseMessagePrinter(message);
else if (messageType.equals("u"))
newPrinter = new UpperCaseMessagePrinter(message);

messageLabel.setText(newPrinter.getMessage());
}
}

class GeneralMessagePrinter
{
private String message;

public GeneralMessagePrinter(String message)
{
this.message = message;
}

public String getMessage()
{
return (message);
}
}

class LowerCaseMessagePrinter extends GeneralMessagePrinter
{
public LowerCaseMessagePrinter(String message)
{
super(message.toLowerCase());
}
}

class UpperCaseMessagePrinter extends GeneralMessagePrinter
{
public UpperCaseMessagePrinter(String message)
{
super(message.toUpperCase());
}
}
-----------end of Hello1.java--------

[xylex_blaiste]

that -d option puts the class file in a specified directory if i remember it right. hmmm... so you don't have to do that unless you want to. is it a compile-error message? or just a warning? like maybe it's warning you of a deprecated class? you should be able to compile normally by just using javac. are there user paths set or packages anywhere?

[cybermilky]

Originally posted by xylex_blaiste
that -d option puts the class file in a specified directory if i remember it right. hmmm... so you don't have to do that unless you want to. is it a compile-error message? or just a warning? like maybe it's warning you of a deprecated class? you should be able to compile normally by just using javac. are there user paths set or packages anywhere?

It shows this message:
Note: Hello1.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.

[xylex_blaiste]

note that not all warnings mean error and the compiler will stop compiling your class. that particular error just tells you that your class uses a deprecated API. it still compiles as it should. if you want to know which parts are deprecated use that option as advised by the message. - d is not -deprecation. compile a class with no deprecated parts in it and see if the message still apears.

[cybermilky]

Originally posted by xylex_blaiste
note that not all warnings mean error and the compiler will stop compiling your class. that particular error just tells you that your class uses a deprecated API. it still compiles as it should. if you want to know which parts are deprecated use that option as advised by the message. - d is not -deprecation. compile a class with no deprecated parts in it and see if the message still apears.

what is deprecation API?

[ArchAngel]

OK. Deprecated APIs are classes and methods which were supplied with an earlier version of Java. However, use of these methods and classes is now discouraged, usually because a serious design flaw has been found in them and new classes and/or methods have been written to replace them.

If you use a deprecated API, the java compiler will warn you. If you want to find out *which* deprecated classes and methods you're using, you should re-compile the classes with the -deprecation switch (not -d, that's something different).

Hope this is clear,

ArchAngel.

[ArchAngel]

C:\docs\forums\deprecation_test>javac -deprecation Hello1.java
Hello1.java:22: warning: resize(int,int) in java.awt.Component has been deprecated
resize (200, 50);
^
1 warning


This means that the method 'resize(int, int)' in the Java class java.awt.Component should no longer be used. If you look at the Java API:

file:///C:/bin/Java/SDK/1.3.1/docs/api/java/awt/Component.html#resize(java.awt.Dimension)

You see that you should now call resize() with a Dimension object.

[xylex_blaiste]

ya, better to heed these warnings as they (deprecated methods/classes) will soon be phased-out...but javac still compiled your classes and it can be run. like i said, it's not an error. only a warning.