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String strA = new String("Hello");
String strB = new String("Hello");
��������Ǿ������ڵģ�����strA��new�ģ���strB�Ǵ��ļ��ж�����
strA==strBΪfalse
��Ƚ�strA��strBʱ������strA.equals(strB);
��sun��Ϊ��strA.intern()==strB.intern()��Ч��Ҫ��ǰ�߸ߡ�

intern��doc������ģ�
A pool of strings, initially empty, is maintained privately by the class 
String. 

When the intern method is invoked, if the pool already contains a string 
equal to this String object as determined by the equals(Object) method, then 
the string from the pool is returned. Otherwise, this String object is added 
to the pool and a reference to this String object is returned. 

It follows that for any two strings s and t, s.intern() == t.intern() is true 
if and only if s.equals(t) is true. 

pool��ʼ�ǿյģ����strA��strB��ȵĻ������ص�ֵҲ����ȵġ��Ҿ���sun��������
֮������strA=strB.intern();��������Ϊ��ٶ�pool�е��Ǹ�reference����strA��

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: ���������
: String��
: ==��ʾ����Object�Ƿ���ͬһ��reference
: equals��ʾString�������Dz�����ͬ
: intern����ѯ��pool���Dz���������ƥ���String�����о�ʹ����û���ٴ�����
: eg:
: String str = new String("hi");
: String str2 = str.intern();
: ??
: >>  .................<����ʡ��>............


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