public class Bird
{
private static int id = 0;
private String kind;
public Bird(String requiredKind)
{
id = id + 1;
kind = requiredKind;
}
public String toString()
{
return "Kind: " + kind + ", Id: " + id + "; ";
}
public static void main(String [] args)
{
Bird [] birds = new Bird[2];
birds[0] = new Bird("falcon");
birds[1] = new Bird("eagle");
for (int i = 0; i < 2; i++)
System.out.print(birds[i]);
System.out.println();
}
}
为什么这会返回Kind: falcon, Id: 2; Kind: eagle, Id: 2
我真的不知道吗?鸟类[0]和鸟类[1]有不同的情况,它们的ID是2?为什么它不是1和1?为什么他们有相同的ID?
静态变量是从类变量不同。从id中删除“static”。 – 2012-01-03 03:55:22
@DarylTeo - 静态变量与* instance *变量不同。它们与* class *变量相同。见:http://en.wikipedia.org/wiki/Class_variable – 2012-01-03 04:02:41
@lwburk有一个大脑屁=)。我的坏,谢谢。 – 2012-01-03 05:14:22