Java-在一个包装器对象中包装一个原始类型

使用基本类型的包装对象，好处可以为空且可以序列化

 package com.tj;

 public class MyClass2 {
     public static void main(String[] args) {
         // 为每一个原始类型创建包装对象
         Boolean refBoolean = new Boolean(true);
         Byte refByte = new Byte((byte) 123);
         Character refChar = new Character('x');
         Short refShort = new Short((short) 123);
         Integer refInt = new Integer(123);
         Long refLong = new Long(123L);
         Float refFloat = new Float(12.3F);
         Double refDouble = new Double(12.3D);

         // 取回值得包装对象
         boolean bool = refBoolean.booleanValue();
         byte b = refByte.byteValue();
         char c = refChar.charValue();
         short s = refShort.shortValue();
         int i = refInt.intValue();
         long l = refLong.longValue();
         float f = refFloat.floatValue();
         double d = refDouble.doubleValue();
     }
 }