我正在读一本书,并在Java中遇到了“阴影变量”一词,但没有任何描述。最终这些变量用于什么以及如何实施?
答案 0 :(得分:8)
我可能会要求您在此处阅读相关内容,而不是提供我自己的说明:http://en.wikipedia.org/wiki/Variable_shadowing。一旦理解了变量的阴影,我建议您继续阅读有关覆盖/阴影方法和可见性的内容,以全面了解这些术语。
实际上,因为这个问题在Java中被问到这里是一个小例子:
public class Shadow {
private int myIntVar = 0;
public void shadowTheVar(){
// since it has the same name as above object instance field, it shadows above
// field inside this method
int myIntVar = 5;
// If we simply refer to 'myIntVar' the one of this method is found
// (shadowing a seond one with the same name)
System.out.println(myIntVar);
// If we want to refer to the shadowed myIntVar from this class we need to
// refer to it like this:
System.out.println(this.myIntVar);
}
public static void main(String[] args){
new Shadow().shadowTheVar();
}
}