2. 假定文件名是“Fred.java”,下面哪个是正确的类声明。
A. public class Fred{ public int x = 0; public Fred (int x){ this.x=x; } }
B. public class fred{ public int x = 0; public Fred (int x){ this.x=x; } }
C. public class Fred extends MyBaseClass, MyOtherBa
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