public class PairOfObjects{

    private Object first;
    private Object second;

    public PairOfObjects( Object first, Object second){
        this.first = first;
        this.second = second;
    }

    public void setFirst( Object first ){
        this.first = first;
    }

    public Object getFirst( ){
        return first;
    }

    public void setSecond( Object second ){
        this.second = second;
    }

    public Object getSecond( ){
        return second;
    }

    @Override
    public String toString(){
        return "PairOfObjects: " + first.toString() + ", " + second.toString();
    }

    public static void main( String[] args ){

        String myStr = new String( "Hello" );
        Integer myInt = 42;
        Double myDouble = 3.141596;
        Character myChar = '1';

        PairOfObjects strInt = new PairOfObjects( myStr, myInt );
        String str = (String) strInt.getFirst();
        System.out.println( "First: " + str );
        System.out.println( strInt );

        System.out.println();

        PairOfObjects doubleChar = new PairOfObjects( myDouble, myChar );
        Double d = (Double) doubleChar.getFirst();
        System.out.println( "First: " + d );
        System.out.println( doubleChar );

    }
}