CODEWITHSUNDEEP
javastring
Muhammad Imran Tariq
Muhammad Imran Tariq

Reputation: 23352

Concatenate string names

Its a very strange question but I was thinking if there is any solution for it?

Scenerio is that I want to concatenate a String name

Like there is a String:

public static final String MYSQL_USERNAME = "mysql_user";
public static final String DB2_USERNAME = "db2admin";
public static final String ORACLE_USERNAME = "oracleuser";

...

if(dbType == "mysql"){
   username = "MYSQL"+_username;
   ...
}else if(dbType == "db2"){
   username = "DB2"+_username;
   ...
}else if(dbType == "oracle"){
   username = "ORACLE"+_username;
   ...
}

i.e. at runtime I want to concatenate String based on dbType and fetch username.

Basically I want to make "MYSQL"+_username = MYSQL_USERNAME

I want to avoid these 3 if's

There should be only 1 line 

username = dbType+_username;

Upvotes: 0

Views: 92

Answers (2)

John Kugelman
John Kugelman

Reputation: 361565

Set up a map with the user names.

public static final Map<String, String> userNames = new HashMap<>();
{
    userNames.put("mysql",  "mysql_user");
    userNames.put("db2",    "db2admin");
    userNames.put("oracle", "oracleuser");
}

Then you can look up the desired entry in the map given the database name.

userName = userNames.get(dbType);

Upvotes: 0

duffymo
duffymo

Reputation: 308743

I think this is a bad solution.

A better one would use database-specific .properties files with identical key names for each database. Your code need not know or care which database you're connecting to that way.

Upvotes: 1

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