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toBeTopJavaer
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final是Java中的一个关键字,它所表示的是“这部分是无法修改的”。
使用 final 可以定义 :变量、方法、类。
### final变量
如果将变量设置为final,则不能更改final变量的值(它将是常量)。
class Test{
final String name = "Hollis";
}
一旦final变量被定义之后,是无法进行修改的。
### final方法
如果任何方法声明为final,则不能覆盖它。
class Parent {
final void name() {
System.out.println("Hollis");
}
}
当我们定义以上类的子类的时候,无法覆盖其name方法,会编译失败。
### final类
如果把任何一个类声明为final,则不能继承它。
final class Parent {
}
以上类不能被继承!
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