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这两个问题虽然不太难，纯属记忆问题，但是在面试的时候还是很容易被问到的，再强调一次，面试还是很容易问到的……面试题目……

C++空类默认成员函数

class EmptyCppClass{  public:      EmptyCppClass(); // 缺省构造函数      EmptyCppClass( const EmptyCppClass& ); // 拷贝构造函数      ~EmptyCppClass(); // 析构函数      EmptyCppClass& operator=( const EmptyCppClass& ); // 赋值运算符      EmptyCppClass* operator&(); // 取址运算符      const EmptyCppClass* operator&() const; // 取址运算符 const};

Java Object类默认成员函数

public class Object{
       private static native void registerNatives();    static {        registerNatives();    }    public native int hashCode();    public boolean equals(Object obj) {        return (this == obj);    }    protected native Object clone() throws CloneNotSupportedException;    public String toString() {        return getClass().getName() + "@" + Integer.toHexString(hashCode());    }    public final native void notify();    public final native void notifyAll();    public final native void wait(long timeout) throws InterruptedException;    public final void wait(long timeout, int nanos) throws InterruptedException {        if (timeout < 0) {            throw new IllegalArgumentException("timeout value is negative");        }        if (nanos < 0 || nanos > 999999) {            throw new IllegalArgumentException(                                "nanosecond timeout value out of range");        }        if (nanos > 0) {            timeout++;        }        wait(timeout);    }    public final void wait() throws InterruptedException {        wait(0);    }    protected void finalize() throws Throwable { }}

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