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I neeed help on java compiler

2 replies on 1 page. Most recent reply: Apr 24, 2005 10:39 AM by Malinda

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Malinda

Posts: 4
Nickname: malinda
Registered: Feb, 2005

I neeed help on java compiler

Posted: Feb 2, 2005 8:52 AM

i seriously need help on java compiler the phases of the compiler and hw does it deliver the Byte code and the link to the JVM. if theres any online articles,links i should visit please advise me!!

my mail: malinda.fernando@gmail.com

Pradeep

Posts: 3
Nickname: pradeepa
Registered: Jan, 2005

Re: I neeed help on java compiler

Posted: Feb 4, 2005 1:57 AM

Hi Malinda ,

Use the javac - verbose option for a simple java file . and you can observe what javac complier will do will compling the java class file. for detail documentation go for doc.sun.com

Pradeep.J

Malinda

Posts: 4
Nickname: malinda
Registered: Feb, 2005

I neeed help on javap option (Execution)

Posted: Apr 24, 2005 10:39 AM

when a small program like

class Hello{

public static void main(String arg[])

{

System.out.println("HEllo World");

}

}

was compiled and then the i took the java byte code instruction
through JAVAP option(disassembler)
the byte code instructions for the above program was

Compiled from "Hello.java"
class Hello extends java.lang.Object{
Hello();
Code:
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return

public static void main(java.lang.String[]);
Code:
0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3; //String HEllo World
5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/Str
ing;)V
8: return

}
without giving the program "Hello.java"
to the JVM how can i run the "Hello" program through JVM by giving the
above byte code instructions "which was gained by using the javap
option" to the JVM??

basicaly I want to get the output of "Hello World" by giving the below
byte code instructions to the JVM

Compiled from "Hello.java"
class Hello extends java.lang.Object{
Hello();
Code:
0: aload_0
1: invokespecial #1; //Method java/lang/Object."<init>":()V
4: return

public static void main(java.lang.String[]);
Code:
0: getstatic #2; //Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #3; //String HEllo World
5: invokevirtual #4; //Method java/io/PrintStream.println:(Ljava/lang/Str
ing;)V
8: return

}

please send me the way that i should execute it through JVM!!!!

Thank you

- Malinda

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