方法的类和参数可以干扰吗? [英] Can fields of the class and arguments of the method interfere?

问题描述

我有一个带有称为"a"的字段的类.在该类中，我有一个方法，在该方法的参数列表中，我也有"a".那么，我将在方法内部看到哪个"a"?是该字段还是该方法的参数?

I have a class with a fields called "a". In the class I have a method and in the list of arguments of this method I also have "a". So, which "a" I will see inside of the method? Will it be the field or it will be the argument of the method?

public class myClass {
   private String a;
   // Method which sets the value of the field "a".
   public void setA(String a) {
     a = a;
   }
}

顺便说一句，也有类似的情况.方法具有一些局部(用于方法)变量，它们的名称与字段的名称一致.如果我在方法内部引用了这种方法局部变量(字段或局部变量)，该方法会看到"什么?

By the way, there is a similar situation. A method has some local (for method) variables whose names coincide with the names of the fields. What will the "see" the method if I refer to such a method-local variable inside the method (the field or the local variable)?

推荐答案

本地作用域具有更高的优先级，因此参数a将隐藏字段a.实际上，您将参数a的值设置为其自身.避免名称冲突(并提高可读性)的正确习惯是使用this显式标记类成员:

The more local scope has the priority, so the parameter a will hide the field a. In effect, you set the value of parameter a to itself. The proper idiom to avoid name clashes (and improve readability) is to use this to explicitly mark the class member:

public void setA(String a) {
  this.a = a;
}

局部变量与成员变量相同:局部变量隐藏具有相同名称的成员变量.

The same is true for local variables vs member variables: local variables hide member variables with the same name.

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