(b) Given below is the class Car. Explain why this class is mutable. What changes must be made

to the class to make it immutable? Re-write it making the necessary changes.

public class Car{

private String make, model, regNum;

public Car(String mdl, String mk, String reg){

model = mdl; make = mk; regNum = reg;

}

public String getMake(){return make;}

public String getModel(){return model;}

public String getRegNum(){return regNum;}

public void setModel(String m){model = m;}

public void setMake(String m){make = m;}

public void setRegNum(String r){regNum = r;}

public String toString() {return make + + model + + regNum;}

}