数组常量只能用于初始化错误答案

【问题标题】：Arrays constants can only be used in initializers error数组常量只能用于初始化错误
【发布时间】：2011-09-14 23:07:31
【问题描述】：

考虑：

public proj 3 {

    static string [][]Item;

    public static void main(String [] args){

        Item[][] = {
             {"BH," , "Backhoe,"            , "200.00"},
             {"ER," , "Electric Rake,"      ,  "10.00"},
             {"EL," , "Electric Lawnmower," ,  "15.00"},
             {"TR," , "Trencher"            ,  "35.00"},
             {"MU," , "Mulcher,"            ,  "20.00"},
             {"TS," , "Tree Sprayer,"       ,  "22.00"},
             {"CP," , "Cider Press,"        ,  "30.00"},
             {"PR," , "Pruner,"             ,  "12.00"},
             {"GE," , "Gas Edger,"          ,  "20.00"},
             {"RO," , "Roller,"             ,   "8.00"},

我怎样才能做到这一点，以便我可以从不同的方法调用数组？

【问题讨论】：

我真的不明白你的问题。能不能具体一点。请修复您的代码。
这看起来不太像 Java。 public proj 3{ 是什么？ string 应该是 String。
对不起，草率的代码，问题是我想声明多维数组以使其成为全局变量。所以可以在整个类中调用数组。

标签： java arrays multidimensional-array

【解决方案1】：

这意味着你必须像这样初始化它：

public class Proj3{

    public static String [][] Item = {
              {"BH," , "Backhoe," , "200.00"},
              {"ER," , "Electric Rake," , "10.00"},
              {"EL," , "Electric Lawnmower," , "15.00"},
              {"TR," , "Trencher" , "35.00"},
              {"MU," , "Mulcher," , "20.00"},
              {"TS," , "Tree Sprayer," , "22.00"},
              {"CP," , "Cider Press," , "30.00"},
              {"PR," , "Pruner," , "12.00"},
              {"GE," , "Gas Edger," , "20.00"},
              {"RO," , "Roller," , "8.00"}
         };

public static void main(String [] args){
     ...
}

如果要使用数组初始值设定项，则不能拆分声明和赋值。

【讨论】：

"如果要使用数组初始化器，不能拆分声明和赋值。"这。非常感谢。
除非在下面的各种答案中描述，使用 new 运算符，这在技术上是该规则的一个例外。

【解决方案2】：

如果您的目标是： 1. 在某处声明它； 2.在其他地方初始化它； 3.还是想用{...}格式。这将起作用：

public proj 3 {

    static string [][]Item;

    public static void main(String [] args) {

        string[][] _Item = {
             {"BH," , "Backhoe," , "200.00"},
             {"ER," , "Electric Rake," , "10.00"},
             {"EL," , "Electric Lawnmower," , "15.00"},
             {"TR," , "Trencher" , "35.00"},
             {"MU," , "Mulcher," , "20.00"},
             {"TS," , "Tree Sprayer," , "22.00"},
             {"CP," , "Cider Press," , "30.00"},
             {"PR," , "Pruner," , "12.00"},
             {"GE," , "Gas Edger," , "20.00"},
             {"RO," , "Roller," , "8.00"}
        };
        Item = _Item;

【讨论】：

【解决方案3】：

你可以像这样全局声明一个多维数组：

String [][] 2DArray;

然后在main方法中同样初始化如下：

 2DArray = new String[][] {
                {"array_element_0", "array_element_1"},
                {"array_element_2", "array_element_3"},
                ...
            };

【讨论】：

【解决方案4】：

您有两个选择：在声明中

private static String[][] item = {...};

或

在其他地方使用 new 关键字 private static String[][] item = new String[][]{...}

另外，您需要将public proj 更改为public class

【讨论】：

【解决方案5】：

我不能 100% 确定我是否正确理解了您的意思，但您可以通过完全限定静态类成员来引用它。

public class MyClass {
  // static class member
  public static String myStaticArray;

  // non-static class method
  public void myMethod() {
    MyClass.myStaticArray = {...}; // do stuff
  }
}

【讨论】：