Thanks to gonglinyuan

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/util/EventHandler.java

@@ -17,7 +17,7 @@
  */
 package org.jackhuang.hellominecraft.util;
 
-import java.util.HashSet;
+import java.util.ArrayList;
 import org.jackhuang.hellominecraft.util.func.Consumer;
 
 /**
@@ -27,9 +27,7 @@ import org.jackhuang.hellominecraft.util.func.Consumer;
  */
 public class EventHandler<T> {
 
-    HashSet<Event<T>> handlers = new HashSet<>();
-    HashSet<Consumer<T>> consumers = new HashSet<>();
-    HashSet<Runnable> runnables = new HashSet<>();
+    ArrayList<Object> events = new ArrayList<>();
     Object sender;
 
     public EventHandler(Object sender) {
@@ -37,38 +35,42 @@ public class EventHandler<T> {
     }
 
     public void register(Event<T> t) {
-        handlers.add(t);
+        if (!events.contains(t))
+            events.add(t);
     }
 
     public void register(Consumer<T> t) {
-        consumers.add(t);
+        if (!events.contains(t))
+            events.add(t);
     }
 
     public void register(Runnable t) {
-        runnables.add(t);
+        if (!events.contains(t))
+            events.add(t);
     }
 
     public void unregister(Event<T> t) {
-        handlers.remove(t);
+        events.remove(t);
     }
 
     public void unregister(Consumer<T> t) {
-        consumers.remove(t);
+        events.remove(t);
     }
 
     public void unregister(Runnable t) {
-        runnables.remove(t);
+        events.remove(t);
     }
 
     public boolean execute(T x) {
         boolean flag = true;
-        for (Event<T> t : handlers)
-            if (!t.call(sender, x))
-                flag = false;
-        for (Consumer<T> t : consumers)
-            t.accept(x);
-        for (Runnable t : runnables)
-            t.run();
+        for (Object t : events)
+            if (t instanceof Event) {
+                if (!((Event) t).call(sender, x))
+                    flag = false;
+            } else if (t instanceof Consumer)
+                ((Consumer) t).accept(x);
+            else if (t instanceof Runnable)
+                ((Runnable) t).run();
         return flag;
     }
 

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/util/func/CallbackIO.java

@@ -0,0 +1,29 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2013  huangyuhui <huanghongxun2008@126.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hellominecraft.util.func;
+
+import java.io.IOException;
+
+/**
+ *
+ * @author huangyuhui
+ */
+public interface CallbackIO<T> {
+
+    void call(T t) throws IOException;
+}

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/util/system/JdkVersion.java

@@ -28,7 +28,7 @@ import org.jackhuang.hellominecraft.util.StrUtils;
  *
  * @author huangyuhui
  */
-public final class JdkVersion {
+public final class JdkVersion implements Cloneable {
 
     private String ver;
 
@@ -69,6 +69,15 @@ public final class JdkVersion {
         return location == null ? 0 : new File(location).hashCode();
     }
 
+    @Override
+    protected Object clone() {
+        try {
+            return super.clone();
+        } catch (CloneNotSupportedException ex) {
+            throw new Error(ex);
+        }
+    }
+
     public JdkVersion(String location) {
         File f = new File(location);
         if (f.exists() && f.isFile())
@@ -103,13 +112,13 @@ public final class JdkVersion {
      */
     public static final int JAVA_19 = 6;
 
-    private static final String javaVersion;
-    private static final int majorJavaVersion;
+    private static final String JAVA_VER;
+    private static final int MAJOR_JAVA_VER;
 
     static {
-        javaVersion = System.getProperty("java.version");
+        JAVA_VER = System.getProperty("java.version");
         // version String should look like "1.4.2_10"
-        majorJavaVersion = parseVersion(javaVersion);
+        MAJOR_JAVA_VER = parseVersion(JAVA_VER);
     }
 
     private static int parseVersion(String javaVersion) {
@@ -136,7 +145,7 @@ public final class JdkVersion {
      * @see System#getProperty(String)
      */
     public static String getJavaVersion() {
-        return javaVersion;
+        return JAVA_VER;
     }
 
     /**
@@ -155,7 +164,7 @@ public final class JdkVersion {
      * @see #JAVA_17
      */
     public static int getMajorJavaVersion() {
-        return majorJavaVersion;
+        return MAJOR_JAVA_VER;
     }
 
     public static boolean isJava64Bit() {

HMCLAPI/src/main/java/org/jackhuang/hellominecraft/util/system/ZipEngine.java

@@ -115,10 +115,11 @@ public class ZipEngine {
 
     public void putStream(InputStream is, String pathName) throws IOException {
         int length;
-        BufferedInputStream bis = new BufferedInputStream(is);
-        zos.putNextEntry(new ZipEntry(pathName));
-        while ((length = bis.read(buf)) > 0)
-            zos.write(buf, 0, length);
+        try (BufferedInputStream bis = new BufferedInputStream(is)) {
+            zos.putNextEntry(new ZipEntry(pathName));
+            while ((length = bis.read(buf)) > 0)
+                zos.write(buf, 0, length);
+        }
     }
 
     public void putTextFile(String text, String pathName) throws IOException {