public class Bunch {         
    
        //  Field

        private float m_charge;
        private String m_type;

        //  Constructors
	
        public Bunch(float charge,String type) {
                m_charge = charge;
			m_type = type;
        }
        
        public Bunch(String type) {
        	this(1F,type);
        }


        //  Methods
	
        public String type( ) {
		return m_type;
        }
        
	public float charge(){
		return m_charge;
	}

	public Bunch merge(Bunch otherBunch) {
		float newCharge = m_charge + otherBunch.m_charge;
                String newType ;
                if(m_type==otherBunch.m_type){
                        newType= m_type;
                }else{
                        newType="mixed";
                }
		Bunch newBunch = new Bunch(newCharge,newType);
		return newBunch;
        }
}