applyPattern() in SimpleDateFormat gives NullPointerEcxeption with white space in java -

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i have code formats date pattern dd-mm-yyyy:

     simpledateformat sdf = new simpledateformat("yyyy-mm-dd't'hh:mm:ss.s");     sdf.applypattern("yyyy-mm-dd");      date date_out = null;     try {         date_out = sdf.parse(date);     } catch (parseexception e) {         // todo auto-generated catch block         e.printstacktrace();     }  sdf.format(date_out);

however when change separator "-" white space or slash "/" nullpointerecxeption on format() line. simpledateformat accept white space or other character date separators?

the issue sdf.parse(date); null if date not match pattern. if change pattern of simpledateformat object don't change format of date parsing parseexception thrown , date_out null. sdf.format() throw nullpointerexception when try format null string.

based on comment think bit more explanation required examples - i'm editing answer appropriately...

simpledateformat applypattern changes pattern of simpledateformat object acts in same way string in constructor does, is, tells formatter pattern expect / use output.

for think want, need 2 simpledateformatters, input 1 , output one. eg.

simpledateformat sdfinput = new simpledateformat("yyyy-mm-dd't'hh:mm:ss.s"); simpledateformat sdfoutput = new simpledateformat(yyyy mm dd"); date date_out = null; try {         date_out = sdfinput.parse(date); } catch (parseexception e) {         // todo auto-generated catch block         e.printstacktrace(); } string myoutputteddate = sdfoutput.format(date_out);

having said guess put applypattern after parsing, , before output so...

simpledateformat sdf = new simpledateformat("yyyy-mm-dd't'hh:mm:ss.s"); string reformatteddate = ""; date date_out = null; try {         date_out = sdf.parse(date); } catch (parseexception e) {         // todo auto-generated catch block         e.printstacktrace(); } sdf.applypattern("yyyy mm dd"); if (date_out != null) {     reformatteddate = sdf.format(date_out); }

hope helps bit more.


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