Stack Overflow Asked by maaz on January 26, 2021
I have a list like this:
List tripIds = new ArrayList()
def sql = Sql.newInstance("jdbc:mysql://localhost:3306/steer", "root", "", "com.mysql.jdbc.Driver")
sql.eachRow("SELECT trip.id from trip JOIN department WHERE organization_id = trip.client_id AND department.id = 1") {
println "Gromit likes ${it.id}"
tripIds << it.id
}
On printing tripids gives me value:
[1,2,3,4,5,6,]
I want to convert this list to simple string like:
1,2,3,4,5,6
How can I do this?
Use join, e.g.,
tripIds.join(", ")
Unrelated, but if you just want to create a list of something from another list, you'd be better off doing something like a map or collect instead of manually creating a list and appending to it, which is less idiomatic, e.g. (untested),
def sql = Sql.newInstance("jdbc:mysql://localhost:3306/steer", "root", "", "com.mysql.jdbc.Driver")
def tripIds = sql.map { it.id }
Or if you only care about the resulting string,
def tripIds = sql.map { it.id }.join(", ")
Correct answer by Dave Newton on January 26, 2021
you can try the following approach to convert list into String
StringBuffer sb = new StringBuffer();
for (int i=0; i<tripIds.size(); i++)
{
if(i!=0){
sb.append(",").append(tripIds.get(i));
}else{
sb.append(tripIds.get(i));
}
}
String listInString = sb.toString();
System.out.println(listInString);
Example
ArrayList<String> tripIds = new ArrayList<String>();
tripIds.add("a");
tripIds.add("b");
tripIds.add("c");
StringBuffer sb = new StringBuffer();
for (int i=0; i<tripIds.size(); i++)
{
if(i!=0){
sb.append(",").append(tripIds.get(i));
}else{
sb.append(tripIds.get(i));
}
}
String listInString = sb.toString();
System.out.println(listInString);
Answered by Sunil Kumar Sahoo on January 26, 2021
Use the join method that Groovy addes to Collection
List l = [1,2,3,4,5,6]
assert l.join(',') == "1,2,3,4,5,6"
Answered by Dónal on January 26, 2021
In groovy:
def myList = [1,2,3,4,5]
def asString = myList.join(", ")
Answered by Mike Thomsen on January 26, 2021
String str = tripIds.toString();
str = str.substring(1, str.length() - 1);
Answered by AlexR on January 26, 2021
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