在Java编程中,遇到“variable 'a' might not have been initialized”错误时,通常意味着编译器检测到变量a可能在使用之前没有被正确初始化。以下是关于这个问题的详细解释、原因分析及解决方法: 1. 变量初始化的概念 变量初始化是指为变量分配一个初始值的过程。在Java中,局部变量(即在方法内部声明的变量)必须在使...
int position_before = 0, position_after = 0, smallVowel = 0, largeVowel = 0;建议你用eclipse来写java代码，这样出错的时候IDE会自动提示，一目了然
private Statement stmt=null; ResultSet rs=null; public firm() { try { Class.forName(sDBDrive); } catch (java.lang.ClassNotFoundException e) { System.err.println("virtual_1():"+e.getMessage()); } } public ResultSet executeQuery(String sql) ...
变量season没有被初始化，将 String season;改为 String season=null;或 String season="";就可以了。
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import java.sql.*;public class firm { String sDBDrive ="sun.jdbc.odbc.JdbcOdbcDrive";String sConnStr="jdbc:odbc:firm";private Connection conn=null;private Statement stmt=null;ResultSet rs=null;public firm(){ try { Class.forName(sDBDrive);} catch (java.lang.ClassNotFound...
每初始化,意思就是你只是定义了这个变量,没有为这个变量分配空间 java里创建一个对象是分三步的 1 创建一个对象 Object o 2 创建空间 new Object()3 两个相关联Object o = new Object()
c# FileSystemWatcher does not raise an event when a file is modified. It only raises the event when a file is created or deleted C# Fill: SelectCommand.Connection property has not been initialized. C# Find specific slot no of the USB Hub(10 slots) where USB is connected or not. I want ...
[init] This might take a minute or longer if the control plane images have to be pulled. ... What you expected to happen: Cluster initialized. --> Kubernetes master inilized How to reproduce it (as minimally and precisely as possible): ...
Can not sign in using ASP.NET Identity, Value cannot be null.Parameter name: manager Can one Controller have two methodss with same name Can the Index be used by 2 different index methods in the controller? one a Get one a Post ? Can ViewBag data and javascript source code be seen by...