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Java Forum / GUI / January 2005GoTo
Hi everyone, I need to use something in java that is similar to the C language goto statement. This is what i have in a function public int ret() { if { //something //something //This is the part where i need to jump to the end of the //function and not exit the function } //This is the part i need to jump to //some more code //some more code } Is there a way in which the above problem can be got around. Usually in the C language i would use the goto statement. I can't use a labeled break here as there is no loop in my program. I hope someone can help me this problem Thank You Yours Sincerely Richard West 1) You could always set a boolean variable and break out of the if statement, or 2) Copy the same code into the if statement, or 3) Put the code you want to jump to in a new method. Then simply call the new method and return from the current method: public int ret() { if { //something //something //This is the part where i need to jump to the end of the //function and not exit the function newMethod() ; return ; } } public void newMethod(){ //This is the part i need to jump to //some more code //some more code } -- Fahd Shariff http://www.fahdshariff.cjb.net "Let the code do the talking... " > Hi everyone, > [quoted text clipped - 24 lines] > the C language i would use the goto statement. I can't use a labeled > break here as there is no loop in my program. You can label the if statement and use a named break to jump out of it. There's a common misconception that you can only use labelled breaks inside loops; that is true for labelled continues, but not for labelled breaks. You can actually label any statement (although it's only useful to label blocks, as opposed to single statements) and use break to jump out of it: public int ret() { someLabel: { if (...) { //something break someLabel; } // whatever code you want to skip } // the part you need to jump to // some more code } Having said that, if you find yourself needing to do this you would probably be better off trying to restructure your code (by using an else clause, for example...). Hope that helps, Vil. freesoft_2000@yahoo.com scribbled on the stall wall: > Hi everyone, > > I need to use something in java that is similar to the C > language goto statement. > > This is what i have in a function Nicholas Wirth, a prominent figure in computer science once authored a piece (probably before most of you were born) called "GOTOs, considered hazardous". If you need a goto then reevaluate your logic. There are legitimate cases where a goto is valid but with modern constructs, exception checking, etc. their necessity is very infrequent. The only legitimate use of a goto in a high level language is to exit a construct, never to jump into one. noone@uber.usachoice.net (Wiseguy) said: >freesoft_2000@yahoo.com scribbled on the stall wall: >> Hi everyone, [quoted text clipped - 7 lines] >a piece (probably before most of you were born) called "GOTOs, considered >hazardous". Sorry, but: - it was Edsger W. Dijkstra - it was "Goto statement considered harmful" Hmm.. on a more careful look: Dijkstra had titled the paper "Notes on Structured Programming"; later on, Wirth dubbed the paper as "Goto statement considered harmful". The paper is available at http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF ... but naturally this doesn't change the actual issue.  SignatureWolf a.k.a. Juha Laiho Espoo, Finland (GC 3.0) GIT d- s+: a C++ ULSH++++$ P++@ L+++ E- W+$@ N++ !K w !O !M V PS(+) PE Y+ PGP(+) t- 5 !X R !tv b+ !DI D G e+ h---- r+++ y++++ "...cancel my subscription to the resurrection!" (Jim Morrison) Juha Laiho <Juha.Laiho@iki.fi> scribbled on the stall wall: > noone@uber.usachoice.net (Wiseguy) said: >>freesoft_2000@yahoo.com scribbled on the stall wall: [quoted text clipped - 17 lines] > statement considered harmful". The paper is available at > http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF I stand corrected...The content seemed more like something Wirth would have written about, since mod-2 was his baby...but then, a real programmer can write fortran code in any language. :^) > Hmm.. on a more careful look: Dijkstra had titled the paper "Notes on > Structured Programming"; later on, Wirth dubbed the paper as "Goto > statement considered harmful". The paper is available at > http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF Actually "Notes on Structured Programming", which Dijkstra wrote in 1969, is not the same thing as the "Go To Statement Considered Harmful" paper, which was published in the March 1968 edition of the CACM as a letter to the editor. The University of Texas (*the* web site to look for Dijksta's papers) has the original, titled "A Case against the GO TO Statement": http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD215.PDF The ACM web site has the paper on their web site, as it was published in "Communications of the ACM": http://www.acm.org/classics/oct95/ In 2001, Dijkstra wrote a historical note describing the experiences that led him to write the "Notes on Structured Programming" paper. At the end, he added the following: Finally a short story for the record. In 1968, the Communications of the ACM published a text of mine under the title "The goto statement considered harmful", which in later years would be most frequently referenced, regrettably, however, often by authors who had seen no more of it than its title, which became a cornerstone of my fame by becoming a template: we would see all sorts of articles under the title "X considered harmful" for almost any X, including one titled "Dijkstra considered harmful". But what had happened? I had submitted a paper under the title "A case against the goto statement", which, in order to speed up its publication, the editor had changed into a "letter to the Editor", and in the process he had given it a new title of his own invention! The editor was Niklaus Wirth. A PDF of Dijkstra's note (in his own handwriting) is available here: http://www.cs.utexas.edu/users/EWD/ewd13xx/EWD1308.PDF SignatureRegards, John McGrath Free MagazinesGet these publications absolutely FREE for up to 12 months. 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