java - Comparable Class equals 函数适用于私有(private)变量？

Question

好吧，我的代码可以工作，但我只是不明白为什么 private 变量在这种情况下工作，在函数 equals() 内。

或者这只是一个技巧，如果您从同一类型的对象结构中调用另一个对象，那么 private 标识符就不算数？

public class TestClass implements Comparable <TestClass> {
    private final String name;
    public TestClass(String name) {
        this.name = name;
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof TestClass) {
            return ((TestClass) obj).name.equals(name); //<- how does this work, isn't name private?
        } else {
            return false;
        }
    }

    @Override
    public int compareTo(TestClass test) {
        int thisValue = hashCode();
        int otherValue = test.hashCode();
        if (thisValue < otherValue) {
            return -1;
        } else if (thisValue > otherValue) {
            return 1;
        } else {
            return 0;
        }
    }

    @Override
    public String toString() {
        return name;
    }
}

Answer 1

是的，这些修饰符是类定义范围的，而不是实例范围的。检查JavaOO tutorials和 Java Language Specification :

Otherwise, if the member or constructor is declared private, then access is permitted if and only if it occurs within the body of the top level class (§7.6) that encloses the declaration of the member or constructor.