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Java Forum / First Aid / November 2005How to compile a java program w/ another java programs which are w/o a main method
I have been reviewing my "Java Tutorial" lately. For the CounterDemo.java in IO\example-1dot1, javac CounterDemo.java showed an error message that can not find the CountWriter/CountReader classes. I have compiled these two java files at the same driectory. How do I compile counterDemo.java? TIA, Jeffrey G:\JavaTutExamples\essential\io\example-1dot1>javac CounterDemo.java CounterDemo.java:5: cannot find symbol symbol : class CountReader location: class CounterDemo CountReader cr = new CountReader(new FileReader("farrago.txt"), 'e'); ^ CounterDemo.java:5: cannot find symbol symbol : class CountReader location: class CounterDemo CountReader cr = new CountReader(new FileReader("farrago.txt"), 'e'); ^ CounterDemo.java:6: cannot find symbol symbol : class CountWriter location: class CounterDemo CountWriter cw = new CountWriter(new FileWriter("outagain.txt"), 'e'); ^ CounterDemo.java:6: cannot find symbol symbol : class CountWriter location: class CounterDemo CountWriter cw = new CountWriter(new FileWriter("outagain.txt"), 'e'); ^ 4 errors > I have been reviewing my "Java Tutorial" lately. For the > CounterDemo.java in IO\example-1dot1, javac CounterDemo.java showed an > error message that can not find the CountWriter/CountReader classes. I > have compiled these two java files at the same driectory. That sounds odd. Are you saying that CountWriter.class and CountReader.class are both in the same directory as CounterDemo.java? > How do I compile counterDemo.java? It should compile OK if the class files for CountWriter/Reader are present, as I was asking above, but your compilation errors below (now snipped) are suggesting they are *not* found. Did you put any package statements in the other classes? (Did you change them at all?) Try this. G:\J...\example-1dot1>javac -classpath . CounterDemo.java The FilterReader and FilterWriter are also shown in CounterDemo.java: CountReader cr = new CountReader(new FileReader("farrago.txt"), 'e'); CountWriter cw = new CountWriter(new FileWriter("outagain.txt"), 'e'); -- Jeffrey Thanks. Tried " javac -classpath . CounterDemo.java " It worked. Reviewing the CounterReader and CounterWriter java files, found: public class CountReader extends FilterReader { public class CountWriter extends FilterWriter { I can not find FilterReader or FilterWriter in my G:\JavaTutExamples. Is this an error? Jeffrey > I can not find FilterReader or FilterWriter in my G:\JavaTutExamples. > Is this an error? Those classes are part of the standard class library that comes with Java. The compiler finds those on its own even though they're not in the same directory as your classes. |\/| /| |2 |< mehaase(at)gmail(dot)com Have run the CounterDemo.class again. It worked well now. I have had another question on how to run the Subclass program. "java Subclass" showed a "NoSuchMethodError" in thread "main" Of course I have a "public class Subclass extends Class {" statement in my Subclass.java file. I can compile Subclass and SubSubclass java files. Just don't know how to run these class files. TIA, Jeffrey > Have run the CounterDemo.class again. It worked well now. > > I have had another question on how to run the Subclass program. Huh? What 'Sublcass' program? Is this something you are writing yourself? Note that 'Subclass' is not written according to the correct nomenclature for a class name, which is EachWordUpperCase. If you want to name it as an extension of another class, it might make sense to add the name of the super class. E.G. 'CounterDemoSubClass' >.. "java > Subclass" showed a "NoSuchMethodError" in thread "main" Please copy/paste output rather than 'describing' it to us.. <http://www.physci.org/codes/javafaq.jsp#exact> >... Of course I > have a "public class Subclass extends Class {" statement in my > Subclass.java file. You are telling the compiler that 'Class' class has a main(String[] args) ..method. Is that correct? Doi you see a 'main' here? <http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Class.html#method_summary> OTOH, why the heck are you extending 'Class' rather than a class related to the Counter classes? Are you still working on the counter example, is this code supposed to be related to that code in some way? Andrew, My Subclass question has nothing to do with the CounterDemo. In fact, my question is, for a Super class and a Sub class, how do I start to run the Sub class file? Because both have no Main Method, I had the 'NoSuchMethodError". Later on I added a "public static void main(String[] args) {" to my Sub java file. Compiling the Sub java file showed an 'illegal start of expressioin" error message at the next statement immediately after the main method. How can I start a Sub java file? Jeffrey > Thanks. Tried " javac -classpath . CounterDemo.java " It worked. It would help if you could look into the JavaDocs to try and understand *why* it worked. Why not have a look over this and give us your best idea why that is.. <http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/javac.html#options> Not quite understand what's going on here. After typing "javac -classpath . CounterDemo.java" to run it successfully, just typing "javac CounterDemo" also worked well. I have a Classpath environment variable set to G:\jenut2; . for those java files w/ a pakage statement. CounterDemo.java has no package statement and is not in jenut2 directory, it should work fine w/o -classpath . option. That's all I know. -- Jeffrey Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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