// For complete examples and data files, please go to https://github.com/aspose-tasks/Aspose.Tasks-for-Java
// The path to the documents directory.
String dataDir = Utils.getDataDir(ParentAndChildTasks.class);

Project proj = new Project(dataDir + "Blank2010.mpp");
proj.set(Prj.NEW_TASKS_ARE_MANUAL, new NullableBool(false));
double oneDay = 8d * 60d * 60d * 10000000d;
java.util.Calendar cal = java.util.Calendar.getInstance();
cal.set(2014, 9, 13, 8, 0, 0);
Date startDate = cal.getTime();
proj.set(Prj.START_DATE, startDate);

Task task1 = proj.getRootTask().getChildren().add("Task 1");
cal.set(2014, 9, 13, 8, 0, 0);
task1.set(Tsk.START, cal.getTime());
task1.set(Tsk.DURATION, proj.getDuration(29, TimeUnitType.Day));
Task task2 = proj.getRootTask().getChildren().add("Task 2");

// add child tasks to task 2
Task task3 = task2.getChildren().add("Task 3");
Task task4 = task2.getChildren().add("Task 4");

cal.set(2014, 9, 15, 8, 0, 0);
task3.set(Tsk.START, cal.getTime());
task3.set(Tsk.DURATION, proj.getDuration(3, TimeUnitType.Day));
task3.set(Tsk.CONSTRAINT_TYPE, ConstraintType.StartNoEarlierThan);
task3.set(Tsk.CONSTRAINT_DATE, task3.get(Tsk.START));

cal.set(2014, 9, 17, 8, 0, 0);
task4.set(Tsk.START, cal.getTime());
task4.set(Tsk.DURATION, proj.getDuration(3, TimeUnitType.Day));
task4.set(Tsk.CONSTRAINT_TYPE, ConstraintType.StartNoEarlierThan);
task4.set(Tsk.CONSTRAINT_DATE, task3.get(Tsk.START));

task3.set(Tsk.PERCENT_COMPLETE, 50);
task4.set(Tsk.PERCENT_COMPLETE, 70);

proj.save(dataDir + "ProjectJava.mpp", SaveFileFormat.MPP);