AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Problem pasing shorts to methods          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message jstorta Guest Posted: Sun Jul 17, 2005 2:01 am    Post subject: Problem pasing shorts to methods I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. When I try to compile it, I get these messages. ---------------------------------------------------------- mort.java:4: cannot find symbol symbol : constructor Mortgage(float,float,float,int,int) location: class Mortgage Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), 30, 360 ); ^ mort.java:21: setAllValues(float,float,float,short,short) in Mortgage cannot be applied to (float,float,float,int,int) setAllValues( 150000f, 6.75f, (6.75f / 12), 30, 360 ); ^ 2 errors Here is the code -------------------------------------------------------- public class mort { public static void main( String [] args ) { Mortgage firstMortgage = new Mortgage(); Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), 30, 360 ); System.out.println( "First Mortgagen" ); firstMortgage.printAllValues(); System.out.println( "Second Mortgagen" ); secondMortgage.printAllValues(); } } class Mortgage { float principal; float annualRate, monthlyRate; short termYears, termMonths; Mortgage() { setAllValues( 150000f, 6.75f, (6.75f / 12), 30, 360 ); } Mortgage( float newPrincipal, float newAnnualRate, float newMonthlyRate, short newTermYears, short newTermMonths ) { setAllValues( newPrincipal, newAnnualRate, newMonthlyRate, newTermYears, newTermMonths ); } void setAllValues( float newPrincipal, float newAnnualRate, float newMonthlyRate, short newTermYears, short newTermMonths ) { principal = newPrincipal; annualRate = newAnnualRate; monthlyRate = newMonthlyRate; termYears = newTermYears; termMonths = newTermMonths; } void printAllValues() { System.out.println( "Principal:t" + principal ); System.out.println( "Interest Rate:t" + annualRate + " (" + monthlyRate + "/month)" ); System.out.println( "Term:t" + termYears + " (" + termMonths + "mos)" ); } } Back to top Patricia Shanahan Guest Posted: Sun Jul 17, 2005 4:09 am    Post subject: Re: Problem pasing shorts to methods jstorta wrote: Quote: I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. When I try to compile it, I get these messages. ---------------------------------------------------------- mort.java:4: cannot find symbol symbol : constructor Mortgage(float,float,float,int,int) location: class Mortgage Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), 30, 360 ); ^ mort.java:21: setAllValues(float,float,float,short,short) in Mortgage cannot be applied to (float,float,float,int,int) setAllValues( 150000f, 6.75f, (6.75f / 12), 30, 360 ); ^ 2 errors 30 and 360 are ints, not shorts. There are some contexts, the assignment conversions, in which int constant expressions that fit in the short range are automatically converted to short. The relevant conversion for your parameters is method invocation conversion: "Method invocation conversions specifically do not include the implicit narrowing of integer constants which is part of assignment conversion (§5.2). The designers of the Java programming language felt that including these implicit narrowing conversions would add additional complexity to the overloaded method matching resolution process (§15.12.2)." [http://java.sun.com/docs/books/jls/second_edition/html/conversions.doc.html#12687] Use an explicit cast to short: (short)30 and (short)360. Patricia Back to top John B. Matthews Guest Posted: Sun Jul 17, 2005 5:27 am    Post subject: Re: Problem pasing shorts to methods In article <1121565600.417011.305760 (AT) g43g2000cwa (DOT) googlegroups.com>, "jstorta" <john (AT) storta (DOT) net> wrote: Quote: I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. The underlying problem is that there's no tag to specify a short integer, as there is for float or long. The JLS, sec. 3.10.1*, says, "An integer literal is of type long if it is suffixed with an ASCII letter L or l (ell); otherwise it is of type int." One way to deal with this is to use a casting conversion: Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), (short) 30, (short) 360 ); *<http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html #19247> Quote: When I try to compile it, I get these messages. ---------------------------------------------------------- mort.java:4: cannot find symbol symbol : constructor Mortgage(float,float,float,int,int) location: class Mortgage Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), 30, 360 ); ^ mort.java:21: setAllValues(float,float,float,short,short) in Mortgage cannot be applied to (float,float,float,int,int) setAllValues( 150000f, 6.75f, (6.75f / 12), 30, 360 ); ^ 2 errors [...] I'm not sure it's working in either place. The first error message is saying that there's no constructor named Mortgage with the signature you want. Mortgage itself hasn't been compiled yet. The compiler is inferring the name and signature of the required constructor from your instantiation, and it can't find a matching class named Mortgage. The second error message says: the method setAllValues requires three floats and two shorts; you've called it with three floats and two ints. It may be easier to see what's going on if you put the static method main at the end of class Mortgage and don't use class mort. Hope this helps. -- John jmatthews at wright dot edu www dot wright dot edu/~john.matthews/ Back to top Patricia Shanahan Guest Posted: Sun Jul 17, 2005 1:16 pm    Post subject: Re: Problem pasing shorts to methods John B. Matthews wrote: Quote: In article <1121565600.417011.305760 (AT) g43g2000cwa (DOT) googlegroups.com>, "jstorta" <john (AT) storta (DOT) net> wrote: I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. The underlying problem is that there's no tag to specify a short integer, as there is for float or long. The JLS, sec. 3.10.1*, says, "An integer literal is of type long if it is suffixed with an ASCII letter L or l (ell); otherwise it is of type int." One way to deal with this is to use a casting conversion: Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), (short) 30, (short) 360 ); *<http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html #19247 .... The lack of a tag is not really a problem because the result of taking a string such as "30", converting it to int, and then casting that int to short is exactly the same as the result of a direct conversion to short. You don't lose anything by writing "(short)30". Patricia Back to top John B. Matthews Guest Posted: Sun Jul 17, 2005 5:05 pm    Post subject: Re: Problem pasing shorts to methods In article <uSsCe.9107$8f7.321 (AT) newsread1 (DOT) news.pas.earthlink.net>, Patricia Shanahan <pats (AT) acm (DOT) org> wrote: Quote: John B. Matthews wrote: In article <1121565600.417011.305760 (AT) g43g2000cwa (DOT) googlegroups.com>, "jstorta" <john (AT) storta (DOT) net> wrote: I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. The underlying problem is that there's no tag to specify a short integer, as there is for float or long. The JLS, sec. 3.10.1*, says, "An integer literal is of type long if it is suffixed with an ASCII letter L or l (ell); otherwise it is of type int." One way to deal with this is to use a casting conversion: Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), (short) 30, (short) 360 ); *<http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html #19247 ... The lack of a tag is not really a problem because the result of taking a string such as "30", converting it to int, and then casting that int to short is exactly the same as the result of a direct conversion to short. You don't lose anything by writing "(short)30". Patricia Quite right. I did not mean to suggest adding new tags:-) I only meant that, absent another way to signify a literal short, an explicit cast was required. Your point (in another article) about implicit narrowing conversions in method invocations is particularly cogent (JLS §5.2). Thanks! -- John jmatthews at wright dot edu www dot wright dot edu/~john.matthews/ Back to top George Cherry Guest Posted: Mon Jul 18, 2005 7:11 pm    Post subject: Re: Problem pasing shorts to methods jstorta wrote: Quote: I am just starting with Java and I am writing a program to do some mortgage calculations. I have a method, setAllValues, that accepts a couple short values, in addition to some floats. I use this method inside the constructors for the class. It works fine in my default constructor, but not when I use an overloaded constructor to pass different values. It looks like it is getting confused and thinks I am passing ints instead of shorts. If I change all of the shorts to ints it works fine. I can't figure out why it is not working with shorts. When I try to compile it, I get these messages. ---------------------------------------------------------- mort.java:4: cannot find symbol symbol : constructor Mortgage(float,float,float,int,int) location: class Mortgage Mortgage secondMortgage = new Mortgage( 200000f, 7.75f, (7.75f / 12), 30, 360 ); ^ mort.java:21: setAllValues(float,float,float,short,short) in Mortgage cannot be applied to (float,float,float,int,int) setAllValues( 150000f, 6.75f, (6.75f / 12), 30, 360 ); ^ 2 errors Why are you using shorts. Why are you not using ints? 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