java簡單工廠模式

1.新建計算類

public class Operation {
	private double _numa;
	private double _numb;
	private double _result;

	/**
	 * 獲取_numa
	 * 
	 * @return _numa
	 */

	public double get_numa() {
		return _numa;
	}

	/**
	 * 設置_numa
	 * 
	 * @param _numa
	 */
	public void set_numa(double _numa) {
		this._numa = _numa;
	}

	/**
	 * 獲取_numb
	 * 
	 * @return _numb
	 */

	public double get_numb() {
		return _numb;
	}

	/**
	 * 設置_numb
	 * 
	 * @param _numb
	 */
	public void set_numb(double _numb) {
		this._numb = _numb;
	}

	/**
	 * 獲取_result
	 * 
	 * @return _result
	 */

	public double get_result() {
		return _result;
	}

	/**
	 * 設置_result
	 * 
	 * @param _result
	 */
	public void set_result(double _result) {
		this._result = _result;
	}
}


2.新建一個加法類繼承OpetationAdd並重寫get_result()方法

public class OperationFactory {
	/**
	 * 創建運算類
	 */
	public static Operation createOperation(String operator) {
		Operation operation = null;
		switch (operator) {
		case "+":
			operation = new OperationAdd();
			break;

		default:
			break;
		}
		return operation;
	}

	/**
	 * 描述方法的作用
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		Operation op = new OperationFactory().createOperation("+");
		op.set_numa(2);
		op.set_numb(2);
		System.out.println(op.get_result());
	}

}


3.新建OperationFactory類並新建createOperation()方法實現抽象運算

public class OperationFactory {
	/**
	 * 創建運算類
	 */
	public static Operation createOperation(String operator) {
		Operation operation = null;
		switch (operator) {
		case "+":
			operation = new OperationAdd();
			break;

		default:
			break;
		}
		return operation;
	}

	

}


4.測試運行加法

public static void main(String[] args) {
		Operation op = new OperationFactory().createOperation("+");
		op.set_numa(2);
		op.set_numb(2);
		System.out.println(op.get_result());
	}


總結:

以後需要修改加法只要修改OperationAdd類即可
如果需要添加其他複雜運算,只要添加相關類並在OperationFactory類的createOperation()方法中添加switch分支即可

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