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你在數組上調用函數equals,比較的是c和ch的位址
改成
if(Arrays.equals(ch,c));
就可以比較c和ch的内容了
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java.sun.com上說，
The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).
It doesn't perform an intelligent comparison for most classes unless the class overrides it. It has been defined in a meaningful way for most Java core classes. If it's not defined for a (user) class, it behaves the same as ==.
"If it's not defined for a (user) class, it behaves the same as =="由于你沒有重寫equals方法，是以它比較的是數組的位址，相當于是==。
另外，有問題可以去sun.java.com上找每個class的說明，也可以裝個Netbeans java版(開源的)，Netbeans 直接提供每個方法的說明
望采納