how to compile java with assert statement

[SOAP]

how to compile java with assert statement
I failed to compile this simple example
public class Foo
{
public void m1( int value )
{
assert 0 <= value;
System.out.println( "OK" );
}

public static void main( String[] args )
{
Foo foo = new Foo();
System.out.print( "foo.m1( 1 ): " );
foo.m1( 1 );
System.out.print( "foo.m1( -1 ): " );
foo.m1( -1 );
}
}

# javac Foo.java
Foo.java:5: warning: as of release 1.4, assert is a keyword, and may not be
used as an identifier
assert 0 <= value;
^
Foo.java:5: not a statement
assert 0 <= value;
^
Foo.java:5: ';' expected
assert 0 <= value;

would you please tell me why? thank you
~ ªÑ²¼»ù®æ¦³¤É¦³¶^, ¶R½æ*n¯à©Ó¾á*·ÀI ~

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[Raymond DeCampo]

SOAP wrote:

how to compile java with assert statement

Read the documentation that came with the JVM, specifically on the javac
tool.

HTH,
Ray

--
XML is the programmer's duct tape.

[Jeff Zhuk]

Most of current IDE tools have the option: "allow assert keyword"

By default it is usually off, and you can turn it on.

If you use javac, you can use the switch in the command line that enables
assertions.

javac -enableassertions YourFile.java
or
javac -ea YourFile.java

--
Jeff Zhuk

720-299-4701
http://JavaSchool.com
jz***@email.uophx.edu
alternative: jz***@javaschool.com
ITS, Inc., Chief Architect/Principal Instructor

"SOAP" <[e-mail]> wrote in message news:42******@usenet.hk...

how to compile java with assert statement
I failed to compile this simple example
public class Foo
{
public void m1( int value )
{
assert 0 <= value;
System.out.println( "OK" );
}

public static void main( String[] args )
{
Foo foo = new Foo();
System.out.print( "foo.m1( 1 ): " );
foo.m1( 1 );
System.out.print( "foo.m1( -1 ): " );
foo.m1( -1 );
}
}

# javac Foo.java
Foo.java:5: warning: as of release 1.4, assert is a keyword, and may not
be
used as an identifier
assert 0 <= value;
^
Foo.java:5: not a statement
assert 0 <= value;
^
Foo.java:5: ';' expected
assert 0 <= value;

would you please tell me why? thank you
~ ªÑ²¼»ù®æ¦³¤É¦³¶^, ¶R½æ*n¯à©Ó¾á*·ÀI ~

~ Samba, more than a low cost File and Printer server ~

-- Let us OpenSource --

[Jeff Zhuk]

You also need to enable runtime assertions with the switch

java -ea:your.package YourClass

Find more at
http://java.sun.com/j2se/1.4.2/docs/...html#compiling

--
Jeff Zhuk

720-299-4701
http://JavaSchool.com
jz***@email.uophx.edu
alternative: jz***@javaschool.com
ITS, Inc., Chief Architect/Principal Instructor

"SOAP" <[e-mail]> wrote in message news:42******@usenet.hk...

how to compile java with assert statement
I failed to compile this simple example
public class Foo
{
public void m1( int value )
{
assert 0 <= value;
System.out.println( "OK" );
}

public static void main( String[] args )
{
Foo foo = new Foo();
System.out.print( "foo.m1( 1 ): " );
foo.m1( 1 );
System.out.print( "foo.m1( -1 ): " );
foo.m1( -1 );
}
}

# javac Foo.java
Foo.java:5: warning: as of release 1.4, assert is a keyword, and may not
be
used as an identifier
assert 0 <= value;
^
Foo.java:5: not a statement
assert 0 <= value;
^
Foo.java:5: ';' expected
assert 0 <= value;

would you please tell me why? thank you
~ ªÑ²¼»ù®æ¦³¤É¦³¶^, ¶R½æ*n¯à©Ó¾á*·ÀI ~

~ Samba, more than a low cost File and Printer server ~

-- Let us OpenSource --