java - 继承和静态变量

Question

父类(super class)的静态变量是否可用于子类。即我的意思是我们可以在子类中访问父类(super class)的静态变量而不创建对象N而不使用ClassName。

Answer 1

相同的可见性约束适用于静态和非静态变量。所以这是可能的:

public class SuperClass {
    /*
     * public would also work, as would no modifier 
     * if both classes are in the same package
     */
    protected static String foo;
}

public class SubClass extends SuperClass {
    public void modifyFoo() {
        foo = "hello";
    }

    public void modifySuperFoo() {
        /*
         * does the exact same thing as modifyFoo()
         */
        SuperClass.foo = "hello";
    }
}