数组常量只能用于初始值设定项错误

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"}, 

我怎么能这样做，所以我可以用不同的方法调用数组？

Answer 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，则无法拆分声明和赋值。

Answer 2

您有两种选择：在声明中

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

要么

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

此外，您需要将public proj更改为public class

Answer 3

我不是100％确定我是否正确理解你的意思，但你可以通过完全限定它来引用静态类成员。

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

Answer 4

您可以像这样全局声明多维数组：

 String [][] 2DArray; 

然后在main方法中初始化相同的内容如下：

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

Answer 5

如果你的目标是：1。在某处宣布它; 2.在其他地方初始化它; 3.仍然想使用{…}格式。 这将有效：

 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; 

Answer 6

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

以上是正确的方法。 您的代码中的[] []有点奇怪;）