JavaFX问答式计算器

效果展示

设计Counter类：

package sample;

 

/**

 * Created by shenqianqian on 17/10/14.

 */

public class Counter {

    private double num1=0.0;

    private double num2=0.0;

    private char flag;

    public String[] intS;

    public Counter(String text){

        if(text.contains("+")){//判断输入文本中的计算符号

            intS=text.split("\\+");//用正则表达式去掉字符串中的符号

            this.flag='+';

            this.num1=Integer.parseInt(intS[0]);

            this.num2=Integer.parseInt(intS[1]);

        }

        else if(text.contains("-")){

            intS=text.split("\\-");

            this.flag='-';

            this.num1=Integer.parseInt(intS[0]);

            this.num2=Integer.parseInt(intS[1]);

        }

        else if(text.contains("*")){

            intS=text.split("\\*");

            this.flag='*';

            this.num1=Integer.parseInt(intS[0]);

            this.num2=Integer.parseInt(intS[1]);

        }

        else {

            intS=text.split("\\D");

            this.flag='/';

            this.num1=Integer.parseInt(intS[0]);

            this.num2=Integer.parseInt(intS[1]);

        }

    }

    public double getResult(){//计算结果

        switch (this.flag){

            case '+':

                return num1+num2;

            case '-':

                return num1-num2;

            case '*':

                return num1*num2;

            case '/':

                return num1/num2;

            default:

                return 0;

        }

    }

}

 

 

设计Main类

import javafx.application.Application;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.scene.Scene;

import javafx.scene.control.Label;

import javafx.scene.control.ScrollPane;

import javafx.scene.control.TextArea;

import javafx.scene.control.TextField;

import javafx.scene.layout.BorderPane;

import javafx.stage.Stage;

 

import java.util.regex.Matcher;

import java.util.regex.Pattern;

 

public class Main extends Application {

 

    @Override // Override the start method in the Application class

    public void start(Stage primaryStage) {

        // Panel p to hold the label and text field

        BorderPane paneForTextField = new BorderPane();

        paneForTextField.setPadding(new Insets(5, 5, 5, 5));

        paneForTextField.setStyle("-fx-border-color: green");

        paneForTextField.setLeft(new Label("请输入: "));

 

        TextField tf = new TextField();

        tf.setAlignment(Pos.BOTTOM_RIGHT);

        paneForTextField.setCenter(tf);

 

        BorderPane mainPane = new BorderPane();

        // Text area to display contents

        TextArea ta = new TextArea();

        mainPane.setCenter(new ScrollPane(ta));

        mainPane.setTop(paneForTextField);

 

        // Create a scene and place it in the stage

        Scene scene = new Scene(mainPane, 450, 200);

        primaryStage.setTitle("CounterText "); // Set the stage title

        primaryStage.setScene(scene); // Place the scene in the stage

        primaryStage.show(); // Display the stage

 

        tf.setOnAction(event -> {//为文本框设置响应时间

            String text=tf.getText();

            //正则表达式去除汉字

            String reg = "[\u4e00-\u9fa5]";

            Pattern pat = Pattern.compile(reg);

            Matcher mat=pat.matcher(text);

            String rStr = mat.replaceAll("");

            Counter counter=new Counter(rStr);

            //取结果

            double res=counter.getResult();

            //文本域展示

            ta.setText(rStr+" = "+res+'\n');

        });

    }

}