当子类属性与父类属性重叠时
这种叫法上是shadowing
最常见的例子就是应用于setter中,当然楼主提到的是子类对父类属性的shadow
int width;
. . .
public void setWidth(int width) {
this.width = width;
}
shadowing会容易造成迷惑,所以一般对shadowing持慎用态度
关于这个主题,分门别类大概有四种
Shadowing, Overriding, Hiding and Obscuring
1.shadowing
指属性的隐藏
2.overriding
指实例方法的覆盖,运行时可发生多态
3.hiding
指静态方法的覆盖,无多态
4.obscuring
是自定义变量名与系统中已存在类型重叠时
看一下这个:
class A {
static int MIN_PRIORITY = 59;
};
public class Obscure {
static A Thread;
public static void main(String args[]) {
// print value of class
// variable Thread.MIN_PRIORITY
System.out.println(Thread.MIN_PRIORITY);
// print value of
// java.lang.Thread.MIN_PRIORITY
System.out.println(java.lang.Thread.MIN_PRIORITY);
}
}
referenced from: http://jroller.com/navanee/entry/shadowing_overriding_hiding_obscuring
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