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PONull pointer exception when changing int in another class
 

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    <p>Ive looked and looked and cant find the answer. But here is my issue. I am wanting to change a int in another class based on ticks in the main Game class. Here is the code:</p> <p>Trace:</p> <pre><code> 02-16 02:10:58.605: W/dalvikvm(1578): threadid=13: thread exiting with uncaught exception (group=0x40c5ca68) 02-16 02:10:58.615: E/AndroidRuntime(1578): FATAL EXCEPTION: Thread-16720 02-16 02:10:58.615: E/AndroidRuntime(1578): java.lang.NullPointerException 02-16 02:10:58.615: E/AndroidRuntime(1578): at com.mojang.ld22.Game.tick(Game.java:374) 02-16 02:10:58.615: E/AndroidRuntime(1578): at com.mojang.ld22.Game.iterate(Game.java:300) 02-16 02:10:58.615: E/AndroidRuntime(1578): at com.mojang.ld22.GameActivity$4.run(GameActivity.java:136) 02-16 02:10:58.615: E/AndroidRuntime(1578): at java.lang.Thread.run(Thread.java:856) </code></pre> <p>Game.java Snippet</p> <pre><code> public void tick() { tickCount++; ... ... ... if (tickCount % 1000 == 0) { if (rising) { lightlvl++; Would error here too clock.time++; &lt;----------- if (lightlvl &gt;= 8) { rising = false; } } else { lightlvl--; LINE 374 ----------&gt; clock.time--; &lt;------------ if (lightlvl &lt;= -2) rising = true; } } } } </code></pre> <p>And Clock.java</p> <pre><code> package com.mojang.ld22.entity; import com.mojang.ld22.crafting.Crafting; import com.mojang.ld22.entity.particle.TextParticle; import com.mojang.ld22.entity.particle.TimeClock; import com.mojang.ld22.gfx.Color; import com.mojang.ld22.gfx.Screen; import com.mojang.ld22.screen.CraftingMenu; import com.mojang.ld22.item.FurnitureItem; public class Clock extends Furniture { /** * */ private static final long serialVersionUID = 3146189783597003582L; Player player; public int time = 0; public int clock = 1; public boolean rising = false; public Clock() { super("Clock"); col = Color.get(-1, 100, 321, 431); sprite = 10; xr = 3; yr = 2; } @Override public void tick(){ if (time &lt;= 0) clock = 1; if (time == 1) clock = 1; if (time == 2) clock = 2; if (time == 3) clock = 3; if (time == 4) clock = 4; if (time == 5) clock = 5; if (time == 6) clock = 6; if (time == 7) clock = 7; if (time == 8); clock = 8; } @Override public void render(Screen screen){ int col = Color.get(-1, 531, 000, 534); //incorrect times TODO if (clock == 8) screen.render(x - 8, y - 8, 7 + 11 * 32, col, 0); if (clock == 6) screen.render(x - 8, y - 8, 8 + 11 * 32, col, 0); //noon midnight if (clock == 5) screen.render(x - 8, y - 8, 9 + 11 * 32, col, 0); if (clock == 4) screen.render(x - 8, y - 8, 10 + 11 * 32, col, 0); //Before noon after noon if (clock == 3) screen.render(x - 8, y - 8, 11 + 11 * 32, col, 0); if (clock == 2) screen.render(x - 8, y - 8, 12 + 11 * 32, col, 0); //730pm 530pm if (clock == 1) screen.render(x - 8, y - 8, 13 + 11 * 32, col, 0); if (clock == -1) screen.render(x - 8, y - 8, 14 + 11 * 32, col, 0); } } </code></pre> <p>And yes this isn't pretty. This is basically what I tried when I couldn't pull any int from game.java to clock.java So this was to test sending it. I cant use separate ticks because clock.java isn't created until the player pulls it from his/her inventory.</p> <p>I hope this makes since. I can supply more code if you need it.</p>
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    1. COYou haven't shown how `clock` is declared and initialized in `Game.java`, and that's probably where the problem is. I suspect that `clock` is null, but we can't tell from the information you've given.
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    2. COClock in declared at the top of game.java public Clock clock;
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    3. CO@user1801875 You need to initialise it: `clock = new Clock();` before you can use it.
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