<identifier> 预期。 java的

Question

I have this snippet of java code. I am a noob in java..

Error :

<identifier> expected
cfg = new Config;

Code:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import java.io.*; 

import java.util.*;
import java.util.Properties;

public class Config 
{

   Properties configFile;
  public Config()
{
configFile = new java.util.Properties();
try {           
  configFile.load(this.getClass().getClassLoader().getResourceAsStream("config"));          
}catch(Exception eta){
    eta.printStackTrace();
}
  }

  public String getProperty(String key)
  {
 String value = this.configFile.getProperty(key);       
    return value;
  }

}



public class ClosureBuilder {

cfg = new Config();

private static String JDBC = cfg.getProperty("JDBC");
private static String URL = cfg.getProperty("URL");
private static String DIMENSION_TABLE = cfg.getProperty("DIMENSION_TABLE");
private static String CLOSURE_TABLE = cfg.getProperty("CLOSURE_TABLE");
private static String KEY = cfg.getProperty("KEY");
private static String PARENT_KEY = cfg.getProperty("PARENT_KEY");

private static Object TOP_LEVEL_PARENT_KEY = '0';


private Object topLevel = null;

private Set<Object> processedNodes;

private PreparedStatement aPst;
public static void main(String[] args) throws Exception {

----------- More code --------

Answer 1

Yes, this is the problem:

public class ClosureBuilder {
    cfg = new Config();
    ...
}

At the top level of a class, you can only have:

• Instance initializer blocks ( { ... } )
• Static initializer blocks ( static { ... } )
• Variable declarations
• Constructor declarations
• Method declarations
• Nested type declarations
• Finalizer declarations

This is none of these. If you meant to declare a variable, you should have done so:

private Config cfg = new Config();

If that's not what you intended to do, you should explain your intention.

EDIT: Once you've fixed that, this compiler error seems pretty clear:

class Config is public, should be declared in a file named Config.java

There are two potential fixes for this:

• Make Config non-public
• Move it to a file called Config.java

Either should fix that error (potentially revealing more).

Answer 2

Where are you declaring your cfg variable?

I only see the assignment. I think that may be the reason.

Config cfg = new Config();

Shoud fix it.

Answer 3

Though your intention is not very clear, i assume you want to have the cfg created before any other variable. First declare your class Config as non-public or move to file Config.java. It makes sense to initialize cfg in a static block. Below is a possible code snippet:

private static Config cfg = null;

private static String JDBC = null;

static {

  cfg = new Config();

  JDBC = cfg.getProperty("JDBC"); 

}