So I setup the code so that when the zombie is hit by the bullet it dies and it should spawn another zombie. However when the zombie dies a new one appears for half a second and then is gone. I don't know what i did wrong can anyone help?





 import java.awt.Rectangle;
  
    PVector pos_player;
    Bullet aBullet;
    Zombie zombie;
    Zombie zombie2;
    String[] tileMap;
    int TILE_SIZE = 100;
    PImage[] tiles = new PImage[10];
    float e = 0;
    int Z;
    boolean death;
   
   
    void setup() {
      size(1200, 800);
      smooth();
      tileMap = loadStrings("Level.txt");
      size(TILE_SIZE*tileMap[0].length(),TILE_SIZE*tileMap.length);
      tiles[0] = loadImage("roofLogo.png");
      tiles[1] = loadImage("roof.png");
      tiles[2] = loadImage("lot.png");
      tiles[3] = loadImage("spaces.png");
      tiles[4] = loadImage("roofNcorner.png");
      tiles[5] = loadImage("roofScorner.png");
      tiles[6] = loadImage("roof2.png");
      tiles[7] = loadImage("roof3.png");
      tiles[8] = loadImage("roof4.png");
      tiles[9] = loadImage("spaces2.png");
      pos_player = new PVector( -100, -100, 0);
      aBullet = new Bullet();
      pos_player = new PVector( 100, 400, 0 );
      zombie = new Zombie();
      zombie2 = new Zombie();
    
    
        }
    void draw() {
      for (int i = 0; i < tileMap.length; i++) {
    for (int j = 0; j < tileMap[i].length(); j++) {
      int tileValue = Character.getNumericValue(tileMap[i].charAt(j));
      image(tiles[tileValue],j*TILE_SIZE,i*TILE_SIZE,TILE_SIZE,TILE_SIZE);
    }
  }
     
      stroke(0);
      fill(0,255,0);
      rect( pos_player.x, pos_player.y, 50, 50);
      aBullet.simulate();
      aBullet.draw();
      zombie.simulate();
      zombie.draw();
      if(zombie.hitbox.contains(aBullet.hitbox)) {
        zombie.death();
        if(zombie.death() == true){
          zombie2.draw();
          zombie2.simulate();
        }
       }
      if(pos_player.y<0 ) {
        pos_player.y++;
      }
      if(pos_player.y>750) {
        pos_player.y--;
      }
       if( key == CODED ){
        if( keyCode == UP && keyPressed ){
         pos_player.y--;
        }
        if( keyCode == DOWN && keyPressed ){
          pos_player.y++;
        }
       }
}
    void keyPressed(){
      if( key == ' ' || key == 'f' ){
        aBullet = new Bullet();
      }
    }
 class Bullet{
      PVector p,v;
      Rectangle hitbox;
      Bullet(){
        p = new PVector( pos_player.x+50, pos_player.y+25, 0 );
        v = new PVector(20,0,0);
        hitbox = new Rectangle(int(p.x),int(p.y), 25, 25);
      }
      void simulate(){
        p.x+=v.x;
        p.y+=v.y;
        hitbox = new Rectangle(round(p.x),round(p.y), 25, 25);
      }
     
      void draw(){
        pushStyle();
        fill(255,0,0);
        rectMode(CENTER);
        rect( p.x, p.y, 25, 25);
        popStyle();
        //Hitbox(); 
      }
    }
class Zombie {
      PVector p,v;
      boolean death;
      Rectangle hitbox;
      Zombie(){
        p = new PVector( 1100,random(800),0);
        v = new PVector(-1,0,0);
        hitbox = new Rectangle(int(p.x),int(p.y),50,50);
      }
      void simulate(){
        p.x+=v.x;
        p.y+=v.y;
        hitbox = new Rectangle(round(p.x),round(p.y), 50,50);
      }
      boolean death(){
        v = new PVector(1,0,0);
        return true;
      }
     
       
      void draw(){
        pushStyle();
        fill(0,0,255);
        rectMode(CENTER);
        rect( p.x, p.y, 50, 50);
        popStyle(); 
        if(p.x<200){
          v = new PVector(0,0,0);
          background(0);
        }
        //Hitbox();
      }
}