class SwapMin<T extends Comparable<T>> implements Comparable<T> {
    private T value;

    public SwapMin(T t) {
	value = t;
    }
    
    @Override
    public int compareTo(T o) {
	return o.compareTo(value);
    }
}

interface SwapMin<T extends Comparable<T>> extends Comparable<T> {
}

class SwapMinImpl implements SwapMin<Integer> {

    private Integer value;
    
    public SwapMinImpl(Integer value) {
	this.setValue(value);
    }
    
    @Override
    public int compareTo(Integer o) {
	return getValue().compareTo(o);
    }

    public int compareTo(SwapMinImpl o) {
	return getValue().compareTo(o.getValue());
    }

    public Integer getValue() {
	return value;
    }

    public void setValue(Integer value) {
	this.value = value;
    }
}
...
SwapMinImpl i1 = new SwapMinImpl(2);
SwapMinImpl i2 = new SwapMinImpl(1);
System.out.println(i1.compareTo(i2));