ArrayList Issue in Reducer

ArrayList Issue in Reducer

Hi I'm performing some calculations in reducer and trying to load the data into an ArrayList. When I perform a get operation on ArrayList at later point of code, all objects in ArrayList have same value.
public ArrayList<some_class> temp = new ArrayList<some_class>();
//This is global variable

@Override
public void reduce(Key_class key, Iterator<some_class> values,
        OutputCollector<Text, Text> output, Reporter reporter)
                throws IOException {
    if(this.output==null){
        this.output=output;
    }

    while(values.hasNext())
    {
                    //if i print here
                    //and do the following values.next().val1
                    //I'm getting the right result
        temp.add(values.next());
    }

    System.out.println(temp.get(0).val1);//Wrong result
}
I'm getting output as below: 12/10/2012 10:13 12/10/2012 10:13
Actual output should be : 12/10/2012 09:10 12/10/2012 10:13
Appreciate your help. Thanks!!!