java - Why is my array still NULL -


i attempting create simple way lay out tiles game.

how ever new java , oop, reason variables in array still null after assigned variables them via loop.

what have done wrong, why array still null? thanks.

        stages stage1 = new stages();      public void stage1init() {         stage1.stagew = 30;         stage1.stageh = 30;         stage1.tilesize = 100;          stage1.stagestartx = 2;         stage1.stagestarty = 24;         //layout stage1         int w = stage1.stageh;         int h = stage1.stagew;         for(int = 0; < h; i++) {             for(int j = 0; j < w; j++) {                 stage1.tilepositionx[i][j] = 100 * j;                 stage1.tilepositiony[i][j] = 100 * j;             }         }     }       //draw current stage      public void drawstage1() {         int w = stage1.stageh;         int h = stage1.stagew;         for(int = 0; < h; i++) {             for(int j = 0; j < w; j++) {                 savecurrenttransform();                 translate(stage1.tilepositionx[i][j], stage1.tilepositiony[i][j]);                 drawimage(grasstile, 0, 0, 100, 100);                 restorelasttransform();             }         }     }

thanks responses, needed assign size of array.

public void stage1init() {         stage1.stagew = 30;         stage1.stageh = 30;         stage1.tilesize = 100;          stage1.stagestartx = 2;         stage1.stagestarty = 24;         stage1.tilepositionx = new double[stage1.stagew][stage1.stageh];         stage1.tilepositiony = new double[stage1.stagew][stage1.stageh];         //layout stage1         int w = stage1.stageh;         int h = stage1.stagew;         for(int = 0; < h; i++) {             for(int j = 0; j < w; j++) {                 stage1.tilepositionx[i][j] = 100 * j;                 //edit: looking simular, multipy following not j;                 stage1.tilepositiony[i][j] = 100 * i;             }         }     }

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