Checking If File Exist - If Returned True Then Check Said File For ID

If I'm checking using an if statement if a file exists like so:

public boolean export(String envName,String fromFile,String toFile) {
Vector<String> vector = new Vector<String>();
File file = new File(fromFile);
if(file.exists() && file !=null) {
return true;
}
return false;

If it returns true for existing then how would I do another if statement that would say if file returned true then check said file for an id. If Id exists extract all data associated with that id and store in Vector object. Would it be like this:

if(file==true)
{
//enter rest of code
}