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class IntPair{
	private int i1;
	private int i2;
	public IntPair(int i1, int i2){
		this.i1 = i1;
		this.i2 = i2;
	}
		
	public boolean equals(Object obj){
		if(this == obj)//判断是否是本类的一个引用
			return true;
		if(obj == null)//
			return false;			
		IntPair pair = (IntPair)obj;
		if(this.i1 != pair.i1)
			return false;
		if(this.i2 != pair.i2)
			return false;
		return true;
	}
		
	public int hashCode(){
		int result = 17;
		result = result * 31 + i1;
		result = result * 31 + i2;
		return result;
	}
}

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ArrayList<Entry<IntPairUnique,Double>> al = new ArrayList<Entry<IntPairUnique,Double>>(); 
Collections.sort(al, new Comparator<Entry<IntPairUnique, Double>>(){
	public int compare(Entry<IntPairUnique, Double> o1,
			Entry<IntPairUnique, Double> o2) {
		return Double.compare(o2.getValue(), o1.getValue());
	}
});