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ToDoList.java
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55 lines (47 loc) · 1.4 KB
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package QueuePackage;
import java.util.PriorityQueue;
/**
* 优先队列
*/
public class ToDoList extends PriorityQueue<ToDoList.ToDoItem> {
static class ToDoItem implements Comparable<ToDoItem> {
private char primary;
private int secondary;
private String item;
public ToDoItem(char primary, int secondary, String item) {
this.primary = primary;
this.secondary = secondary;
this.item = item;
}
@Override
public int compareTo(ToDoItem o) {
if (primary > o.primary) {
return 1;
}
if (primary == o.primary) {
if (secondary > o.secondary) {
return 1;
} else if (secondary == o.secondary) {
return 0;
}
}
return -1;
}
@Override
public String toString() {
return Character.toString(primary) + secondary + ": "+item;
}
}
public void add(String id, char pri, int sec) {
super.add(new ToDoItem(pri,sec,id));
}
public static void main(String[] args) {
ToDoList doItems = new ToDoList();
doItems.add("A", 'a', 1);
doItems.add("C", 'a', 2);
doItems.add("A",'b',4);
while (!doItems.isEmpty()) {
System.out.println(doItems.remove());
}
}
}