java - Spawn balls randomly -


im making game balls spawn randomly each side of smartphone screen, , got working although balls spawn on top side of screen , 2/10 times on bottom , sides of screen. heres code:

//creates balls , sets position random timer each private void spawnballs1() {      rectangle ball1 = new rectangle();     ball1.x = mathutils.random(639, 641);     ball1.y = 720;     ball1.width = 32;     ball1.height = 32;     balls1.add(ball1);     lastdroptime = timeutils.nanotime();  }  private void spawnballs2() {      rectangle ball2 = new rectangle();     ball2.x = 0;     ball2.y = mathutils.random(359, 361);     ball2.width = 32;     ball2.height = 32;     balls2.add(ball2);     lastdroptime = timeutils.nanotime(); }  private void spawnballs3() {      rectangle ball3 = new rectangle();     ball3.x = mathutils.random(639, 641);     ball3.y = 0;     ball3.width = 32;     ball3.height = 32;     balls3.add(ball3);     lastdroptime = timeutils.nanotime(); }  private void spawnballs4() {      rectangle ball4 = new rectangle();     ball4.x = 1280;     ball4.y = mathutils.random(359, 361);     ball4.width = 32;     ball4.height = 32;     balls4.add(ball4);     lastdroptime = timeutils.nanotime(); }   //draws balls     (rectangle ball1 : balls1) {          batch.draw(ball, ball1.x, ball1.y);     }      (rectangle ball2 : balls2) {          batch.draw(ball, ball2.x, ball2.y);     }      (rectangle ball3 : balls3) {          batch.draw(ball, ball3.x, ball3.y);     }      (rectangle ball4 : balls4) {          batch.draw(ball, ball4.x, ball4.y);     }   // if time minus time of last ball spawn less x spawn ball in random place     if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs1();      iterator<rectangle> iter1 = balls1.iterator();     while(iter1.hasnext()) {          rectangle balls1 = iter1.next();         balls1.y -= 500 * gdx.graphics.getdeltatime();         if (balls1.overlaps(square)) {              score++;             showscore = "score: " + score;             iter1.remove();         }     }      // if time minus time of last ball spawn less x spawn ball in random place     if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs2();      iterator<rectangle> iter2 = balls2.iterator();     while (iter2.hasnext()) {          rectangle balls2 = iter2.next();         balls2.x += 500 * gdx.graphics.getdeltatime();         if (balls2.overlaps(square)) {              score++;             showscore = "score: " + score;             iter2.remove();         }     }      // if time minus time of last ball spawn less x spawn ball in random place     if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs3();      iterator<rectangle> iter3 = balls3.iterator();     while(iter3.hasnext()) {          rectangle balls3 = iter3.next();         balls3.y += 500 * gdx.graphics.getdeltatime();         if (balls3.overlaps(square)) {              score++;             showscore = "score: " + score;             iter3.remove();         }     }      // if time minus time of last ball spawn less x spawn ball in random place     if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs4();      iterator<rectangle> iter4 = balls4.iterator();     while(iter4.hasnext()) {          rectangle balls4 = iter4.next();         balls4.x -= 500 * gdx.graphics.getdeltatime();         if (balls4.overlaps(square)) {              score++;             showscore = "score: " + score;             iter4.remove();         }     }

what should do/change make them spawn randomly on each side?

thanks in advance!

all 4 of ball spawning methods share same lastdroptime variable. execution time between 

if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs1();

and 

if (timeutils.nanotime() - lastdroptime > 1000000000) spawnballs4();

is going tiny percentage of 1000000000 ns, it's going unlikely spawnballs2-4 ever called.

you should have 1 test instead of four, , randomly pick 1 of methods. this:

if (timeutils.nanotime() - lastdroptime > 1000000000){     switch (mathutils.randomint(4)){         case 0: spawnballs1(); break;         case 1: spawnballs2(); break;         case 2: spawnballs3(); break;         case 3: spawnballs4(); break;     } }

also, lot of copy-paste code, ballooning time investment. ought write 1 spawnballs method takes parameter affects places balls.


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