From the above introduction, it is now clear that to make anything final we just have to add a final prefix to it. So to make a final class in Java, add a final keyword in front of the class. A final class in Java cannot be inherited or extended, meaning that no subclass can be ...
final class A {},这样定义的类A就是最终类,最终类不可被继承,也就是说,不能写这样的代码,class B extends A {}了。 final void B() {},这样定义的方法就是最终方法,最终方法在子类中不可以被重写,也就是说,如果有个子类继承这个最终方法所在的类,那么这个子类中就不能再出现void B() {}这样的方法...
privatevoidwriteOrdinaryObject(Object obj,ObjectStreamClass desc,boolean unshared)throws IOException{...//调用ObjectStreamClass的写入方法 writeClassDesc(desc, false); // 判断是否实现了Externalizable接口 if (desc.isExternalizable() && !desc.isProxy()) { writeExternalData((Externalizable) obj); } els...
In Java, a class can be marked as final, which means that it cannot be subclassed. This can be useful in a number of situations:
在Java中,关于final关键字的说法正确的是( ) A. 如果修饰变量,则一旦赋了值,就等同一个常量。 B. 如果修饰类,则该类只能被一个子类继承。 C. 如果修饰方法,则该方法不能在子类中被覆盖。 D. 如果修饰方法,则该方法所在的类不能被继承。 相关知识点: ...
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解析 ACD 正确答案:ACD 本题考查final的用法 * final可以修饰类,方法,和变量 * final修饰方法,不可以被重写 * final修饰类,该类不能被继承 * final修饰的变量,为常量,不可改变 选项ACD正确。 选项B错误,final的类中,没有对方法是否final的限定。反馈 收藏 ...
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包装类(Integer,Double,Float,Boolean等都是final),String也是final类,故无法继承~ final和static往往搭配使用,效率更高,不会导致类加载,底层编译器做了优化处理。 (1)定义时给最终静态属性赋值,类不会被加载 (2)定义时没有给最终静态属性赋值,类被加载 ...
A final class can be extended? A final method can be overridden? A final method can be inherited? 答案 final方法将方法声明为final,那就说明你已经知道这个方法提供的功能已经满足你要求,不需要进行扩展,并且也不允许任何从此类继承的类来覆写这个方法,但是继承仍然可以继承这个方法,也就是说可以直接使用....