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Java Forum / General / October 2007Can we do this with println?
Hi, I am new to Java programming. What I wanted to do is shown below using a function like "System.out.println". X03 | X05 | X07 ------------------------------ X04 | X02 | X08 ------------------------------ X01 | X06 | X09 In the diagram above as 'X' is any character and the remaining one is a subscript (01, 02, 03 and so on..). What I want to do then is write the character to the screen in the subscript order X01, X02 and so on.. The problem is I do not get how using "System.out.println" I can go one line above without erasing the whole screen. Of course this is _not_ a homework but something I am trying to do nevertheless. Any help is appreciated. Thanks, Neel. >X03 | X05 | X07 >------------------------------ >X04 | X02 | X08 >------------------------------ >X01 | X06 | X09 You might find it easier to compose one string for each line and then print with println. The ---- could be done with StringTools.rep. See http://mindprod.com/products1.html#COMMON11 The X01 | could be done in a StringBuilder loop.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > In the diagram above as 'X' is any character and the remaining one is > a subscript (01, 02, 03 and so on..). What I want to do then is write > the character to the screen in the subscript order X01, X02 and so > on.. The problem is I do not get how using "System.out.println" I can > go one line above without erasing the whole screen. Of course this is > _not_ a homework but something I am trying to do nevertheless. In an ANSI-compliant terminal (i.e., pretty much anything other than Window's Command Prompt), the following string, when printed out, will print "XXX" at the top of the screen: "\u001B[1;1HXXX" (see <http://en.wikipedia.org/wiki/ANSI_escape_code> for other examples) SignatureBeware of bugs in the above code; I have only proved it correct, not tried it. -- Donald E. Knuth On Mon, 29 Oct 2007 21:42:57 GMT, Joshua Cranmer <Pidgeot18@verizon.invalid> wrote, quoted or indirectly quoted someone who said : >In an ANSI-compliant terminal (i.e., pretty much anything other than >Window's Command Prompt), the following string, when printed out, will >print "XXX" at the top of the screen: without it, you can clear with a sufficiently large number of newlines. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > on.. The problem is I do not get how using "System.out.println" I can > go one line above without erasing the whole screen. Of course this is This kind of cursor control is not provided by Java. It can't, really, it's up to the output device to interpret the meaning of your output. Joshua's pointer to ANSI escape codes was a good one. Remember Java is just sending out a stream of characters. What meaning does "go to the top of the screen" have when the output is being sent to a file? None really.... If you must have control over where things get put in a more device independent manner, Java Swing would be a good choice. You can just draw stuff where you want with the graphics API, or you can use a JEditorPane to put text in certain places like a word processor. All kinda depends on your final application. On Mon, 29 Oct 2007 23:04:53 GMT, Mark Space <markspace@sbc.global.net> wrote, quoted or indirectly quoted someone who said : >This kind of cursor control is not provided by Java. Another approach is to use a JTextArea for your "console". Then you can even do colours and bold. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > On Mon, 29 Oct 2007 23:04:53 GMT, Mark Space > <markspace@sbc.global.net> wrote, quoted or indirectly quoted someone [quoted text clipped - 4 lines] > Another approach is to use a JTextArea for your "console". Then you > can even do colours and bold. Hmm, I'm pretty sure JTextArea only does "plain text." You might be able to bold or color the whole thing. JEditorPane, which I mention above, is the widget that does multiple styles in one document, afaik. > On Mon, 29 Oct 2007 23:04:53 GMT, Mark Space > <markspace@sbc.global.net> wrote, quoted or indirectly quoted someone [quoted text clipped - 4 lines] > Another approach is to use a JTextArea for your "console". Then you > can even do colours and bold. A third approach might be to try to find a JANSIConsole that represents a fully ANSI-compliant terminal that provides an input and output stream. SignatureBeware of bugs in the above code; I have only proved it correct, not tried it. -- Donald E. Knuth 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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