Answers for "check object is empty or null in java"

check if an object is null java

// simple test

String name = null;

if(name != null)
  System.out.printf("Hello Mr.%s\n", name);
else
  System.err.println("error, name == null");

check if object is empty java 8

Optional<Employee> employee = employeeServive.getEmployee();
// Sometimes an Employee has forgotten to write an up-to-date timesheet
Optional<Timesheet> timesheet = employee.flatMap(Employee::askForCurrentTimesheet); 
// We don't want to do the heavyweight action of creating a new estimate if it will just be discarded
client.bill(timesheet.orElseGet(EstimatedTimesheet::new));