open NPC dialogue if you collide with it

src/de/miaurizius/jgame2d/entity/Entity.java

@@ -25,12 +25,15 @@ public class Entity {
     public int solidAreaDefaultX,  solidAreaDefaultY;
     public boolean collisionOn = false;
     public int actionLock = 0;
+    String[] dialogue = new String[20];
+    int dialogueIndex = 0;
 
     public Entity(GamePanel panel) {
         this.panel = panel;
     }
 
     public void setAction() {}
+    public void speak() {}
     public void update() {
         setAction();
         collisionOn = false;

src/de/miaurizius/jgame2d/entity/OldManNPC.java

@@ -13,6 +13,7 @@ public class OldManNPC extends Entity {
         direction = Direction.DOWN;
         speed = 1;
         getImage();
+        setDialogue();
     }
 
     public void getImage()  {
@@ -26,6 +27,13 @@ public class OldManNPC extends Entity {
         right2 = initEntitySprites("npc/oldman_right_2");
     }
 
+    public void setDialogue() {
+        dialogue[0] = "Hello, lad.";
+        dialogue[1] = "So you've come to this island to find the treasure?";
+        dialogue[2] = "I used to be a great wizard but now... I'm a bit too old for taking an adventure";
+        dialogue[3] = "Well, good luck on you.";
+    }
+
     public void setAction() {
         actionLock++;
         if(actionLock != 120) return; //lock action for x frames
@@ -36,7 +44,19 @@ public class OldManNPC extends Entity {
         if(i > 50 && i <= 75) direction = Direction.LEFT;
         if(i > 75) direction = Direction.RIGHT;
         actionLock = 0;
+    }
 
+    public void speak() {
+        if(dialogue[dialogueIndex] == null) dialogueIndex = 0;
+        panel.ui.currentDialogue = dialogue[dialogueIndex];
+        dialogueIndex++;
+
+        switch(panel.player.direction) {
+            case UP -> direction = Direction.DOWN;
+            case DOWN -> direction = Direction.UP;
+            case LEFT -> direction = Direction.RIGHT;
+            case RIGHT -> direction = Direction.LEFT;
+        }
     }
 
 }

src/de/miaurizius/jgame2d/entity/Player.java

@@ -2,10 +2,10 @@ package de.miaurizius.jgame2d.entity;
 
 import de.miaurizius.jgame2d.core.*;
 import de.miaurizius.jgame2d.core.enums.Direction;
+import de.miaurizius.jgame2d.core.enums.GameState;
 import de.miaurizius.jgame2d.core.handlers.KeyHandler;
 
 import java.awt.*;
-import java.awt.image.BufferedImage;
 
 public class Player extends Entity {
 
@@ -91,12 +91,12 @@ public class Player extends Entity {
 
     public void pickObject(int index) {
         if(index == 999) return;
-
     }
 
     public void interactNPC(int index) {
         if(index == 999) return;
-        System.out.println("npc collision detected");
+        panel.gameState = GameState.DIALOGUE;
+        panel.npc[index].speak();
     }
 
     public void draw(Graphics2D graphics2d) {