Java String Concatenation

Question

I have a issue with my java code. i asked the same question yesterday. I got answer but sorry it was my fault. My question is not clear.

I have code looks like this:

Answer 1

public String asString(ProximityTarget target) {
    StringBuilder sb = new StringBuilder("circle:");
    sb.append(target.getGeoPoint().getLatitudeInMicroDegrees()).append(":");
    sb.append(target.getGeoPoint().getLongitudeInMicroDegrees()).append(":");
    sb.append(target.getRadiusDistanceUnits());
    return sb.toString();
}

public void someMethod() {
    //...
    StringBuilder sb = new StringBuilder();
    for(i = 0; i < geo.getTargets().length ; i++ )
    {
        if(geo.getTargets(i).getTargetType().equalsIgnoreCase("ProximityTarget"))
        {
            final ProximityTarget prox = (ProximityTarget)geo.getTargets(i);

            if (!sb.isEmpty())
                sb.append("|");

            sb.append(asString(prox));
        }
    }
    String formattedString = sb.toString();

    //...
}