I have a list of data in the iterator.I want to store it in a string. How can I do it? Here is my code.
List ln = readData(iStepNumber, status, query);
Iterator itr = ln.iterator();
System.out.println("listttt"+ln);
while(itr.hasNext()) {
System.out.println("itr value1 :"+itr.next());
//what to do to store itr.next() in a string
//for example String a=itr.next()?
}
This is what I get in the console
listttt[2017-06-30 23:59:59]
itr value1 :2017-06-30 23:59:59
Instead of just printing itr.next(), save it to a string variable like this:
String yourString = itr.next();
If you have more than one item in the list, you can either do yourString += itr.next(), or use a StringBuilder and StringBuilder.append(), which is much more efficient.
You should use stringbuffer
List ln = readData(iStepNumber, status, query);
Iterator itr = ln.iterator();
System.out.println("listttt"+ln);
StringBuffer sBuffer = new StringBuffer();
while(itr.hasNext()){
sBuffer.append(itr.next());
System.out.println("itr value1 :"+itr.next());
}
Just implement toString() method in your object and output the list using System.out.println(list). This will display all the data without any need of iteration manually in your code.
You can use Java 8 stream API.
Take your list of respective object type
List<Object> ln = readData(iStepNumber, status, query);
Iterator itr = ln.iterator();
System.out.println("listttt"+ln);
// Now call the stream() method on list
String data=ln.stream()
.map(Object::toString)
.collect(Collectors.joining(","));
// Here use whatever you want as string in joining method string and print
// or do what ever you want with string data.
System.out.println(data);
String.join(",", ln)might be what you're looking for, but then I don't see what's wrong with your current output.