面试官：你说你懂动态代理，那你知道为什么JDK中的代理类都要继承Proxy吗？

public final class proxy extends Proxy implements MyService {
    private static Method m1;
    private static Method m4;
    private static Method m2;
    private static Method m3;
    private static Method m0;
    public proxy(InvocationHandler var1) throws  {
        super(var1);
    }
    public final boolean equals(Object var1) throws  {
        try {
            return (Boolean)super.h.invoke(this, m1, new Object[]{var1});
        } catch (RuntimeException | Error var3) {
            throw var3;
        } catch (Throwable var4) {
            throw new UndeclaredThrowableException(var4);
        }
    }
    public final void test01() throws  {
        try {
            super.h.invoke(this, m4, (Object[])null);
        } catch (RuntimeException | Error var2) {
            throw var2;
        } catch (Throwable var3) {
            throw new UndeclaredThrowableException(var3);
        }
    }
    public final String toString() throws  {
        try {
            return (String)super.h.invoke(this, m2, (Object[])null);
        } catch (RuntimeException | Error var2) {
            throw var2;
        } catch (Throwable var3) {
            throw new UndeclaredThrowableException(var3);
        }
    }
    public final void test02(String var1) throws  {
        try {
            super.h.invoke(this, m3, new Object[]{var1});
        } catch (RuntimeException | Error var3) {
            throw var3;
        } catch (Throwable var4) {
            throw new UndeclaredThrowableException(var4);
        }
    }
    public final int hashCode() throws  {
        try {
            return (Integer)super.h.invoke(this, m0, (Object[])null);
        } catch (RuntimeException | Error var2) {
            throw var2;
        } catch (Throwable var3) {
            throw new UndeclaredThrowableException(var3);
        }
    }
    static {
        try {
            m1 = Class.forName("java.lang.Object").getMethod("equals", Class.forName("java.lang.Object"));
            m4 = Class.forName("com.dmz.proxy.target.MyService").getMethod("test01");
            m2 = Class.forName("java.lang.Object").getMethod("toString");
            m3 = Class.forName("com.dmz.proxy.target.MyService").getMethod("test02", Class.forName("java.lang.String"));
            m0 = Class.forName("java.lang.Object").getMethod("hashCode");
        } catch (NoSuchMethodException var2) {
            throw new NoSuchMethodError(var2.getMessage());
        } catch (ClassNotFoundException var3) {
            throw new NoClassDefFoundError(var3.getMessage());
        }
    }
}

// 去 extends Proxy
public final class proxy implements MyService {
    private static Method m1;
    private static Method m4;
    private static Method m2;
    private static Method m3;
    private static Method m0;
    // 这个时候代理类就需要自己持有一个InvocationHandler对象了
  private InvocationHandler h;
    public proxy(InvocationHandler h){
        // super(var1);
        this.h = h;
    }
  // ......
}