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Unexpected behavior with PriorityQueue remove: Why isn't compareTo used?
PriorityQueue<OwnClass> pq=new PriorityQueue<OwnClass>();
OwnClass a=new OwnClass(1);
OwnClass b=new OwnClass(2);
OwnClass c=new OwnClass(3);
pq.add(a);
pq.add(b);
pq.add(c);
System.out.println("head:"+pq.peek());
pq.remove(new OwnClass(1));
System.out.println(pq.peek());

class OwnClass implements Comparable{

    int x;

    public OwnClass(int x){
        this.x=x;
    }

    public int compareTo(Object arg0) {

        OwnClass a=(OwnClass) arg0;
        if(a.x>this.x)
            return -1;
        if(a.x<x)
            return 1;
        return 0;
    }

    public String toString(){
        return ""+x;
    }
}