Mark some utility classes as final.

This makes sense, considering all that is provided is utility methods.

gdx/src/com/badlogic/gdx/math/GeometryUtils.java

@@ -17,7 +17,7 @@
 package com.badlogic.gdx.math;
 
 /** @author Nathan Sweet */
-public class GeometryUtils {
+public final class GeometryUtils {
 	static private final Vector2 tmp1 = new Vector2(), tmp2 = new Vector2(), tmp3 = new Vector2();
 
 	/** Computes the barycentric coordinates v,w for the specified point in the triangle.

gdx/src/com/badlogic/gdx/math/MathUtils.java

@@ -24,7 +24,7 @@
  * <p>
  * Thanks to Riven on JavaGaming.org for the basis of sin/cos/atan2/floor/ceil.
  * @author Nathan Sweet */
-public class MathUtils {
+public final class MathUtils {
 	static public final float nanoToSec = 1 / 1000000000f;
 
 	// ---

gdx/src/com/badlogic/gdx/utils/BufferUtils.java

@@ -32,7 +32,7 @@
 /** Class with static helper methods to increase the speed of array/direct buffer and direct buffer/direct buffer transfers
  * 
  * @author mzechner, xoppa */
-public class BufferUtils {
+public final class BufferUtils {
 	static Array<ByteBuffer> unsafeBuffers = new Array<ByteBuffer>();
 	static int allocatedUnsafe = 0;
 

gdx/src/com/badlogic/gdx/utils/NumberUtils.java

@@ -16,7 +16,7 @@
 
 package com.badlogic.gdx.utils;
 
-public class NumberUtils {
+public final class NumberUtils {
 	/** When false, the mask in {@link #intToFloatColor(int)} will not be used. This must only be used when the resulting floats
 	 * will not be used with {@link #floatToIntColor(float)}. */
 	static public boolean intToFloatColorMask = true;

gdx/src/com/badlogic/gdx/utils/ScreenUtils.java

@@ -30,7 +30,7 @@
  * entire screen content or a portion thereof.
  * 
  * @author espitz */
-public class ScreenUtils {
+public final class ScreenUtils {
 
 	/** Returns the default framebuffer contents as a {@link TextureRegion} with a width and height equal to the current screen
 	 * size. The base {@link Texture} always has {@link MathUtils#nextPowerOfTwo} dimensions and RGBA8888 {@link Format}. It can be

gdx/src/com/badlogic/gdx/utils/StreamUtils.java

@@ -26,7 +26,7 @@
 import java.io.StringWriter;
 
 /** Provides utility methods to copy streams */
-public class StreamUtils {
+public final class StreamUtils {
 	public static final int DEFAULT_BUFFER_SIZE = 8192;
 	public static final byte[] EMPTY_BYTES = new byte[0];
 

gdx/src/com/badlogic/gdx/utils/TimeUtils.java

@@ -18,7 +18,7 @@
 
 /** Wrapper around System.nanoTime() and System.currentTimeMillis(). Use this if you want to be compatible across all platforms!
  * @author mzechner */
-public class TimeUtils {
+public final class TimeUtils {
 	/** @return The current value of the system timer, in nanoseconds. */
 	public static long nanoTime () {
 		return System.nanoTime();