PMD笔记-Avoid reassigning parameters such as 'XXX'

在用PMD检测代码时发现报错如下：

Avoid reassigning parameters such as ‘col’. Reassigning values to incoming parameters is not recommended. Use temporary local variables instead.

报错的代码如下：

    private BaseColumn renderDefectColumn(final BaseColumn col, final Boolean isDefectShown, final Boolean isMeasDefectItems) {if (!isDefectShown) {col = new BaseColumn();col.setReadonly(true);}if (isMeasDefectItems) {col.setReadonly(true);}return col;}

在stackoverflow里找到个一样的问题，有个回答是这样的：

In your case, there’s a parameter named bankRequest. Inside the method, you are assigning bankRequest a value.

By some, it is considered an ill approach to assign values to parameters within a method’s body, as it is, at times, confusing. Some developers prefer always assuming that a parameter is never assigned any value during a method’s run.

To avoid that, you can declare an alternative variable of type BankDTO

因为我在方法体内部把方法的参数重新赋值，于是PMD就报出这个错误。解决方法就是避免在方法体内对方法参数重新赋值，可以将方法参数的值赋给另一个局部变量，如下：

    private BaseColumn renderDefectColumn(final BaseColumn col, final Boolean isDefectShown, final Boolean isMeasDefectItems) {BaseColumn column = col;if (!isDefectShown) {column = new BaseColumn();column.setReadonly(true);}if (isMeasDefectItems) {column.setReadonly(true);}return column;}

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