java-algorithms/ActivitySelection.java at main · Mahidhar05/java-algorithms · GitHub

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importjava.util.ArrayList;
importjava.util.Collections;

publicclassActivitySelection {

staticclassActivity {
intstart;
intend;

publicActivity(intstart, intend) {
this.start = start;
this.end = end;
 }

@Override
publicStringtoString(){
return"[" + this.start + ", " + this.end + "]";
 }
 }

publicstaticvoidmaxActivities(ArrayList<Activity> activities){

//sort the activities in ascending order of meeting finish time
System.out.println("Given Activities: " + activities);
Collections.sort(activities, (o1, o2) -> o1.end - o2.end);

ArrayList<Activity> selectedActivities = newArrayList<>();
intcurrentEnd = -1;
for (inti = 0; i <activities.size() ; i++) {
ActivitycurrentActivity = activities.get(i);
if(currentActivity.start >currentEnd){
selectedActivities.add(currentActivity);
currentEnd = currentActivity.end;
 }
 }

//print selected activities
System.out.println("Selected Activities: " + selectedActivities);
 }

publicstaticvoidmain(String[] args) {
ArrayList<Activity> activities = newArrayList<>();
activities.add(newActivity(1, 3));
activities.add(newActivity(2, 5));
activities.add(newActivity(0, 7));
activities.add(newActivity(6, 8));
activities.add(newActivity(9, 11));
activities.add(newActivity(10, 12));
maxActivities(activities);
 }
}