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 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));check if object is empty java 8
// Changed EmployeeServive to return an optional, no more nulls!
Optional<Employee> employee = employeeServive.getEmployee();
employee.ifPresent(e -> System.out.println(e.getId()));Copyright © 2021 Codeinu
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