有一個(gè)不可變的類型碼，它會(huì)影響類的行為

public class Employee {static final int ENGINNER = 0;static final int SALESMAN = 1;static final int MANAGER = 2;private int type;public Employee(int type) {this.type = type;}public int getType() {return type;} }

重構(gòu)：以子類取代類型碼

public class Employee {static final int ENGINNER = 0;static final int SALESMAN = 1;static final int MANAGER = 2;private int type;public Employee(int type) {this.type = type;}public static Employee create(int type) {switch(type) {case ENGINNER: return new Engineer();case SALESMAN: return new Salesman();case MANAGER: return new Manager();default:throw new IllegalArgumentException("Incorrect type code value.");}}public abstract int getType(); }public class Engineer extends Employee {public int getType() {return Employee.ENGINNER;} }

總結(jié)

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