新增：可用的CharSet打印

Author: JeffLi1993

src/org/javacore/nio/AvailableCharSets.java

@@ -0,0 +1,51 @@
+package org.javacore.nio;
+
+import java.nio.charset.Charset;
+import java.util.Iterator;
+import java.util.SortedMap;
+
+/*
+ * Copyright [2015] [Jeff Lee]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @author Jeff Lee
+ * @since 2015-10-11 19:51:10
+ *  可用的CharSet打印
+ */
+public class AvailableCharSets {
+    public static void main(String[] args) {
+        // charset对象的有序映射
+        SortedMap<String,Charset> charSets =
+                Charset.availableCharsets();
+        // 获取key的迭代器
+        Iterator<String> iterator = charSets.keySet().iterator();
+        while (iterator.hasNext()) {
+            String csName = iterator.next();
+            System.out.print(csName);
+            // 获取别名的Charset集合的迭代器
+            Iterator aliases =
+                    charSets.get(csName).aliases().iterator();
+            if (aliases.hasNext())
+                System.out.print("： ");
+            while (aliases.hasNext()) {
+                System.out.print(aliases.next());
+                if (aliases.hasNext())
+                    System.out.print(",");
+            }
+            System.out.println();
+        }
+    }
+}