java - Java中eval()解析器和2d数组的实现

我真的停留在两个与Java相关的问题上。一种简单而又一种困难。

关于2D数组的创建，我初始化一个表，如下所示：

private String [][] table_of_classifiers = null;

然后，在一个函数中，我像这样填充其内容：

        String [][] table_of_classifiers = {
            {"x1","x","x","x","x"},
            {"x2","x","x","x","x"},
            {"x3","x","x","x","x"},
            {"x4","x","x","x","x"},
            {"x5","x","x","x","x"},
            {"x6","x","x","x","x"},
        };

但是，您可以猜测第二张表（本地）覆盖了第一张表，这当然不是我想要做的。我做错了什么？请注意，表格的尺寸从一开始就未知。

最佳答案

做就是了：

class Foo {
    private String [][] table_of_classifiers = null;

    void bar() {
        table_of_classifiers = new String[][] {
                    {"x1","x","x","x","x"},
                    {"x2","x","x","x","x"},
                    {"x3","x","x","x","x"},
                    {"x4","x","x","x","x"},
                    {"x5","x","x","x","x"},
                    {"x6","x","x","x","x"},
        };
    }
}

Java没有eval（因为它是一种编译语言），但是确实有reflection。但是，几乎可以肯定，这并不是解决您想要做的任何事情的最佳方法。