java - 错误 : cannot assign a value to final variable

Question

我正在做一个赋值，但我遇到了这个错误:无法为最终变量计数赋值

到目前为止，这是我的代码...

public class List
{
    private final int Max = 25;
    private final int count; 
    private Person list[];

    public List()
    {
        count = 0; 
        list = new Person[Max];
    }

    public void addSomeone(Person p)
    {
        if (count < Max){
            count++; // THIS IS WHERE THE ERROR OCCURS 
            list[count-1] = p;
        }
    }

    public String toString()
    {
        String report = "";

        for (int x=0; x < count; x++)
            report += list[x].toString() + "\n"; 

        return report;
    }
}  

我是 java 的新手，显然不是计算机高手，所以请尽可能用最简单的术语解释问题/解决方案。非常感谢。

Answer 1

count++; 会抛出错误。根据 Oracle，

A final variable may only be assigned to once. Declaring a variable final can serve as useful documentation that its value will not change and can help avoid programming errors.

您可以跟随那篇文章here .查看您的代码，您似乎真的不希望 count 成为最终的。您希望能够在整个程序中更改其值。解决方法是删除 final 修饰符。