JAVA Program Question! .class file

**0_0** · 03-19-2010, 01:57 PM

hello everyone,

i'm new to computer science and i was challenged by one of my friends to find out the right code for a class file he gave me.

I have done some work on it but just need your help, this is not a homework assignment, its just for fun

if i'm thankful for anyone who helps me

this is my code

Java Code:

public class Tpi
{
    private static final class Mode extends Enum
    {

	private enum Mode
	{
		UNKNOWN, COMPILE, INTERPRET
	}
        private static final Mode $VALUES[];

        public static Mode[] values()
        {
            return (Mode[])$VALUES.clone();
        }

        public static Mode valueOf(String s)
        {
            return (Mode)Enum.valueOf(Tpi$Mode, s);
        }

        static 
        {
            UNKNOWN = new Mode("UNKNOWN", 0);
            COMPILE = new Mode("COMPILE", 1);
            INTERPRET = new Mode("INTERPRET", 2);
            $VALUES = (new Mode[] {
                UNKNOWN, COMPILE, INTERPRET
            });
        }

        private Mode(String s, int i)
        {
            super(s, i);
        }
    }


    private static final int version = 1;
    private boolean success;
    private String sourceFile;
    private String destinationFile;
    private Mode mode;
    private static final String expectedSourceFileSuffix = ".p";
    private static final String destinationFileSuffix = ".s";

    public static void main(String args[])
    {
        Tpi tpi = new Tpi(args);
    }

    private Tpi()
    {
    }

    public Tpi(String as[])
    {
        success = false;
        mode = Mode.UNKNOWN;
        if(!decodeCommandLine(as))
        {
            return;
        } else
        {
            Parser parser = new Parser(sourceFile);
            success = parser.isSuccessful();
            return;
        }
    }

    public boolean isSuccessful()
    {
        return success;
    }

    private boolean decodeCommandLine(String as[])
    {
        String s;
        int i = ".p".length();
        System.out.println("Tpi version 1");
        if(as.length != 2)
        {
            System.out.println("Invalid number of arguments.");
            explainArguments();
            return false;
        }
        sourceFile = as[1];
        if(sourceFile.length() < i + 1 || !".p".equals(sourceFile.substring(sourceFile.length() - i)))
        {
            System.out.println("sourcefile must end with .p");
            explainArguments();
            return false;
        }
        s = as[0];
        if(!s.equals("-C"))
        {
            break
        }
        destinationFile = sourceFile.substring(0, sourceFile.length() - i);
        new StringBuilder();
        this;
        destinationFile;
        ".s";
        toString();
        destinationFile;
        mode = Mode.COMPILE;
        System.out.println(new StringBuilder() + "Compiling " + sourceFile + " to " + destinationFile);
        break
        if(s.equals("-I"))
        {
            mode = Mode.INTERPRET;
            System.out.println((new StringBuilder()).append("Interpreting ").append(sourceFile).toString());
        } else
        {
            System.out.println("Invalid mode.");
            explainArguments();
            return false;
        }
        return true;
    }

    private void explainArguments()
    {
        System.out.println("Usage: java Tpi mode sourcefile.p");
        System.out.println("where mode is one of the following:");
        System.out.print("-C compiles sourcefile.p");
        System.out.println(", writing assembly code to sourcefile.s");
        System.out.println("-I interprets the contents of sourcefile.p");
    }
}

and i have attached the class file.

Thanx

**collin389** · 03-19-2010, 02:16 PM

none of the class files run. Only Tpi has a main() and it needs Tpi$Mode. And I'm also confused about what you are asking us to do.

**0_0** · 03-21-2010, 06:57 PM

this is the code from the decompiler

Java Code:

import java.io.PrintStream;

public class Tpi
{
    private static final class Mode extends Enum
    {

        public static final Mode UNKNOWN;
        public static final Mode COMPILE;
        public static final Mode INTERPRET;
        private static final Mode $VALUES[];

        public static Mode[] values()
        {
            return (Mode[])$VALUES.clone();
        }

        public static Mode valueOf(String s)
        {
            return (Mode)Enum.valueOf(Tpi$Mode, s);
        }

        static 
        {
            UNKNOWN = new Mode("UNKNOWN", 0);
            COMPILE = new Mode("COMPILE", 1);
            INTERPRET = new Mode("INTERPRET", 2);
            $VALUES = (new Mode[] {
                UNKNOWN, COMPILE, INTERPRET
            });
        }

        private Mode(String s, int i)
        {
            super(s, i);
        }
    }


    private static final int version = 1;
    private boolean success;
    private String sourceFile;
    private String destinationFile;
    private Mode mode;
    private static final String expectedSourceFileSuffix = ".p";
    private static final String destinationFileSuffix = ".s";

    public static void main(String args[])
    {
        Tpi tpi = new Tpi(args);
    }

    private Tpi()
    {
    }

    public Tpi(String as[])
    {
        success = false;
        mode = Mode.UNKNOWN;
        if(!decodeCommandLine(as))
        {
            return;
        } else
        {
            Parser parser = new Parser(sourceFile);
            success = parser.isSuccessful();
            return;
        }
    }

    public boolean isSuccessful()
    {
        return success;
    }

    private boolean decodeCommandLine(String as[])
    {
        String s;
        int i = ".p".length();
        System.out.println("Tpi version 1");
        if(as.length != 2)
        {
            System.out.println("Invalid number of arguments.");
            explainArguments();
            return false;
        }
        sourceFile = as[1];
        if(sourceFile.length() < i + 1 || !".p".equals(sourceFile.substring(sourceFile.length() - i)))
        {
            System.out.println("sourcefile must end with .p");
            explainArguments();
            return false;
        }
        s = as[0];
        if(!s.equals("-C"))
        {
            break MISSING_BLOCK_LABEL_208;
        }
        destinationFile = sourceFile.substring(0, sourceFile.length() - i);
        new StringBuilder();
        this;
        JVM INSTR dup_x1 ;
        destinationFile;
        append();
        ".s";
        append();
        toString();
        destinationFile;
        mode = Mode.COMPILE;
        System.out.println((new StringBuilder()).append("Compiling ").append(sourceFile).append(" to ").append(destinationFile).toString());
        break MISSING_BLOCK_LABEL_270;
        if(s.equals("-I"))
        {
            mode = Mode.INTERPRET;
            System.out.println((new StringBuilder()).append("Interpreting ").append(sourceFile).toString());
        } else
        {
            System.out.println("Invalid mode.");
            explainArguments();
            return false;
        }
        return true;
    }

    private void explainArguments()
    {
        System.out.println("Usage: java Tpi mode sourcefile.p");
        System.out.println("where mode is one of the following:");
        System.out.print("-C compiles sourcefile.p");
        System.out.println(", writing assembly code to sourcefile.s");
        System.out.println("-I interprets the contents of sourcefile.p");
    }
}

and the code in the main post is my code.

the response after runing the java file from my code is:

tpi.java:97: ';' expected
break^
tpi.java:101: not a statement
^this;

tpi.java:102: not a statement
^destinationFile;
tpi.java:103: not a statement
^".s";
tpi.java:105: not a statement
^destinationFile;
tpi.java:108: ';' expected
break^

6 errors

the response of the decompiled .class file.

tpi.java:102: not a statement
^this;

tpi.java:103: not a statement
JVM INSTR^dup_x1 ;
tpi.java:103: not a statement
JVM INSTRd^up_x1 ;
tpi.java:104: not a statement
^destinationFile;
tpi.java:106: ';' expected
".s";
tpi.java:109: not a statement
^destinationFile;
6 errors

i hope someone can help

thanx

**0_0** · 04-06-2010, 04:05 AM

anyone can HELP?!

**Tolls** · 04-06-2010, 12:14 PM

Still not sure what you're expecting here...

Doesn't help you're not showing us where the errors are...have you tried to sort out the compilation errors at all?

**j2me64** · 04-06-2010, 04:21 PM

Originally Posted by 0_0

anyone can HELP?!

i inserted your code in eclipse and my comments in red are not errors at compile time but errors that eclipse recognized. without examining the semantic i must say that the syntax is a disaster. i'm not sure if i got all errors, but these are enough to show how bad the code is ...

Java Code:

import java.io.PrintStream;

public class Tpi
{
    private static final class Mode extends Enum
   [COLOR="Red"]// the type mode may not subclass Enum explicitly[/COLOR] 
    {

        public static final Mode UNKNOWN;
        public static final Mode COMPILE;
        public static final Mode INTERPRET;
        private static final Mode $VALUES[];

        public static Mode[] values()
        {
            return (Mode[])$VALUES.clone();
        }

        public static Mode valueOf(String s)
        {
            return (Mode)Enum.valueOf(Tpi$Mode, s);
            [COLOR="Red"]// Tpi$Mode cannot be resolved[/COLOR]
        }

        static 
        {
            UNKNOWN = new Mode("UNKNOWN", 0);
            COMPILE = new Mode("COMPILE", 1);
            INTERPRET = new Mode("INTERPRET", 2);
            $VALUES = (new Mode[] {
                UNKNOWN, COMPILE, INTERPRET
            });
        }

        private Mode(String s, int i)
        {
            super(s, i);
           [COLOR="Red"] // The constructor Object(String, int) is undefined[/COLOR]
        }
    }


    private static final int version = 1;
    private boolean success;
    private String sourceFile;
    private String destinationFile;
    private Mode mode;
    private static final String expectedSourceFileSuffix = ".p";
    private static final String destinationFileSuffix = ".s";

    public static void main(String args[])
    {
        Tpi tpi = new Tpi(args);
    }

    private Tpi()
    {
    }

    public Tpi(String as[])
    {
        success = false;
        mode = Mode.UNKNOWN;
        if(!decodeCommandLine(as))
        {
            return;
        } else
        {
            Parser parser = new Parser(sourceFile);
            // Parser cannot be resolved by a type[/COLOR]
            success = parser.isSuccessful();
            return;
        }
    }

    public boolean isSuccessful()
    {
        return success;
    }

    private boolean decodeCommandLine(String as[])
    {
        String s;
        int i = ".p".length();
        System.out.println("Tpi version 1");
        if(as.length != 2)
        {
            System.out.println("Invalid number of arguments.");
            explainArguments();
            return false;
        }
        sourceFile = as[1];
        if(sourceFile.length() < i + 1 || !".p".equals(sourceFile.substring(sourceFile.length() - i)))
        {
            System.out.println("sourcefile must end with .p");
            explainArguments();
            return false;
        }
        s = as[0];
        if(!s.equals("-C"))
        {
            break MISSING_BLOCK_LABEL_208;
        }
        destinationFile = sourceFile.substring(0, sourceFile.length() - i);
        new StringBuilder();
        this;
        [COLOR="Red"]// The left-hand side of an assignment must be a variable[/COLOR]
        JVM INSTR dup_x1 ;[/COLOR]
         [COLOR="Red"]// The JVM cannot be resolved to a type[/COLOR]
        destinationFile;
       [COLOR="Red"] // insert "AssignmentOperator Expression" to complete expression[/COLOR]
        append();
       [COLOR="Red"] // undefined for the type Tpi [/COLOR]
        ".s";
    [COLOR="Red"] // insert "Assignment Operator" to complete expression[/COLOR]
        append();
     [COLOR="Red"]// undefined for the type Tpi [/COLOR]
        toString();
        destinationFile;
    [COLOR="Red"] // insert "AssignmentOperator Expression" to complete expression[/COLOR]
        mode = Mode.COMPILE;
        System.out.println((new StringBuilder()).append("Compiling ").append(sourceFile).append(" to ").append(destinationFile).toString());
        break MISSING_BLOCK_LABEL_270;
        if(s.equals("-I"))
        {
            mode = Mode.INTERPRET;
            System.out.println((new StringBuilder()).append("Interpreting ").append(sourceFile).toString());
        } else
        {
            System.out.println("Invalid mode.");
            explainArguments();
            return false;
        }
        return true;
    }

    private void explainArguments()
    {
        System.out.println("Usage: java Tpi mode sourcefile.p");
        System.out.println("where mode is one of the following:");
        System.out.print("-C compiles sourcefile.p");
        System.out.println(", writing assembly code to sourcefile.s");
        System.out.println("-I interprets the contents of sourcefile.p");
    }
}

**0_0** · 04-06-2010, 11:23 PM

okay thanx for your help, i'll try my best to fix it

thanx

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