由于字符串是一个对象，因此需要使用该string.equals(string)方法来确认两个字符串相等。
但是，为什么使用==来检查两个字符是否相等char1 == char2，而不是char1.equals(char2)？
或许，这将有助于了解上的区别==VS equals。
@Test
public void testCharacterEquals() {
//primitive type uses == operator for equals comparasion
char a1 = 'A';
char a2 = 'A';
if (a1 == a2) {
System.out.println("primitive type comparasion: it's equal");
}
//From Java doc; The Character class wraps a value of the primitive type char in an object. An object of type Character contains a single field whose type is char.
//Object type uses equals method for equals comparasion
Character character1 = 'A';
Character character2 = 'A';
if (character1.equals(character2)) {
System.out.println("object type comparasion: it's equal");
}
}
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