sqrtoperation.java

简单的计算器程序

package calculate.operations;

import calculate.Calculate;
import calculate.Operation;

public class SqrtOperation implements Operation {

	public void execute(Calculate calculate) {
		String showText = calculate.getShowText();

		double value = Double.parseDouble(showText);

		if (value < 0) {
			calculate.setShowText(Calculate.ERROR_FUNCTION_INPUT);
		}

		calculate.setShowText(Math.sqrt(value) + "");
	}

}