更新超类的字段 [英] Update fields from superclass

问题描述

从各种模式的角度来看，可以从其后代更改超类中的字段。例如：

From point of various patterns is it acceptable to change fields in superclass from its descendants. For example:

class A {
    int barA;
}

class B extends A {
    private void testMethod() {
        barA = 4;
    }
}

谢谢！

推荐答案

不，通常不是一个好主意。如果我理解您的要求，通常可以这样做

No, it's generally not a good idea. If I understand what you are asking, it would normally be done like

public class A{
     private int val;

     protected void setVal(int i){
        val = i;
     }

     public int getVal(){
        return val;
     }
}

public class B extends A{
    public void test(){
        this.setVal(4);
    }
} 

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