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你在数组上调用函数equals,比较的是c和ch的地址

改成

if(Arrays.equals(ch,c));

就可以比较c和ch的内容了

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java.sun.com上说，

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 =="由于你没有重写equals方法，所以它比较的是数组的地址，相当于是==。

另外，有问题可以去sun.java.com上找每个class的说明，也可以装个Netbeans java版(开源的)，Netbeans 直接提供每个方法的说明

望采纳