static属于class类的，不是属于某个对象的

测试代码块

package yu.bai.array;

public class BerylliumSphere {
private static long counter;
private final long id = counter++;

public String toString(){
return "Sphere" + id;
}

public static long getCounter() {
return counter;
}

public long getId() {
return id;
}

package yu.bai.array;

public class ContainerComparison {
public static void main(String[] args) {
BerylliumSphere[] spheres = new BerylliumSphere[10];

for (int i = 0; i < 5; i++) {
spheres[i] = new BerylliumSphere();
System.out.println(spheres[i].getCounter() + "," + spheres[i].getId());
}
}
}

当执行spheres[0] = new BerylliumSphere()时，debug运行的Variables栏中只有类BerylliumSphere的id属性，并没有显示counter属性。