Food flickering and not being eaten in dodge game

old code

Currently, I am trying to make a game in which the mouse controls a block that will move around, gathering little balls. Every time a ball spawns, an enemy will appear, moving in a linear path.

My program attempts to implement that, however the enemies all spawn at once and are moving right only. The food, when eaten, does not disappear. Instead, when I move the mouse, the food flickers all over the place and the enemy moves all towards the right side. I'm not sure how to make the food appear once and stay there, then when the player eats it, it disappears and spawns another one somewher else, and spawns an enemy as well that moves in left-right or up-down and bounces off the walls.

I would like to make the food spawn in one place, then when I eat it, delete the food and spawn another one randomly.

I am trying to make something similar to this.

Thanks for your help.

EDIT: New code based off of the psuedocode in @AJC's answer

import java.util.ArrayList;
import java.util.Random;

public class Game{
    public static void main(String[] args) {
        StdDraw.setXscale(0,100);
        StdDraw.setYscale(0,100);

        int foodX = 0;
        int foodY = 0;

        ArrayList enemyXPos = new ArrayList();
        ArrayList enemyYPos = new ArrayList();
        ArrayList enemySpeeds = new ArrayList();
        int score = 0;
        Random rand = new Random();

        while (true) {
            double playerX = StdDraw.mouseX();
            double playerY = StdDraw.mouseY();
            StdDraw.clear();

            int enemyX = 0, enemyY = 0;


            if (playerX == foodX && playerY == foodY) {
                score += 1;

                foodX = rand.nextInt(100);
                foodY = rand.nextInt(100);


                enemyX = rand.nextInt(100);
                enemyY = rand.nextInt(100);

                enemyXPos.add(enemyX);
                enemyYPos.add(enemyY);
                int enemySpeed = rand.nextInt(20);
                enemySpeeds.add(enemySpeed);
            }

            for (int j = 0; j < enemyXPos.size()-1; j++) {
                if ((int) enemyXPos.get(j) == playerX && (int) enemyYPos.get(j) == playerY) {
                    break;
                }

            }
            for (int j = 0; j < enemyXPos.size()-1; j++) {
                enemyXPos.add(j, (int) enemyXPos.get(j) + (int) enemySpeeds.get(j));
                enemyYPos.add(j, (int) enemyXPos.get(j) + (int) enemySpeeds.get(j));
            }


            StdDraw.setPenColor(StdDraw.BLUE);
            StdDraw.filledCircle(playerX, playerY, 5);

            StdDraw.setPenColor(StdDraw.GREEN);
            StdDraw.filledCircle(foodX, foodY, 2);

            for (int j = 0; j < enemyXPos.size()-1; j++) {
                StdDraw.setPenColor(StdDraw.RED);
                StdDraw.filledCircle(enemyX, enemyY, 2);
            }
            StdDraw.show();
        }
    }
}

---

There are several problems in your code

You are setting the food to a random position every game loop, so it will not stay in one place. You need to remember the position of the current food, and set a new position only when the player touches it

The enemies are controlled all by one variable, so they will all move in the same direction obviously

There are some other logic flaws, like the updates for the other objects get skipped when the player doesn't move

I also suggest organizing the code into sections, like separating the draw and update cycles

New pseudocode:

Variables:
 - Current food position
 - List of enemy positions
 - List of enemy velocities

Game loop:
    //Update stuff
    Get mouse location
    Set player location to mouse location

    If player is touching food then
        Increase score
        Set food position to random position
        Spawn new enemy:
            Add new random position to enemy position list
            Add new random velocity to enemy velocity list
    End if

    For each enemy:
        If enemy is touching player than
            End game
        End if
    End for

    For each enemy:
        Update enemy location:
            Add velocity of enemy to position of enemy
            (posX=posX+velX)
            (posY=posY+velY)
    End for

    //Draw stuff
    Draw player
    Draw food
    For each enemy:
        Draw that enemy
    End for
End game loop

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