java - Array nullpointerException ERROR -



java - Array nullpointerException ERROR -

here partial code:

`private instrumento[] repinst; public repositorioinstrumentos(){ instrumento[] repinst = new instrumento[20]; } private int getpos(int id){ int pos= -1; for(int i=0; i<tam; i++){ if (repinst[i]!=null&&repinst[i].getid()==id){ pos=i; i=tam; } } homecoming pos; }`

i maintain getting null poiter exception in line:

`if (repinst[i]!=null&&repinst[i].getid()==id){`

all positions of repinst null. thought putting " if " skip , homecoming pos = -1.

why isn't working?

repinst local varible in constructor

private instrumento[] repinst; public repositorioinstrumentos(){ repinst = new instrumento[20]; } private int getpos(int id){ int pos= -1; for(int i=0; i<tam; i++){ if (repinst[i]!=null&&repinst[i].getid()==id){ pos=i; i=tam; } } homecoming pos; }

java arrays nullpointerexception

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