btEqual.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine SE = manager.getEngineByName("js"); String string = new String(showExpression.getText()); try { String ans = SE.eval(string).toString(); showExpression.setText(ans); } catch (Exception e) { // TODO: handle exception showExpression.setText("ERROR!"); } } });
btEqual.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { ScriptEngineManager manager = new
import javafx.application.Application;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.geometry.Insets;import javafx.scene.Scene;import javafx.scene.control.Button;import javafx.scene.control.TextField;import javafx.scene.image.Image;import javafx.scene.image.ImageView;import javafx.scene.layout.BorderPane;import javafx.scene.layout.HBox;import javafx.stage.Stage;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;import javax.script.ScriptException;public class Main extends Application { @Override public void start(Stage primaryStage) throws Exception { // 获取带图片的按钮 Button bt0 = new Button("", new ImageView(new Image("images/0.png"))); Button bt1 = new Button("", new ImageView(new Image("images/1.png"))); Button bt2 = new Button("", new ImageView(new Image("images/2.png"))); Button bt3 = new Button("", new ImageView(new Image("images/3.png"))); Button bt4 = new Button("", new ImageView(new Image("images/4.png"))); Button bt5 = new Button("", new ImageView(new Image("images/5.png"))); Button bt6 = new Button("", new ImageView(new Image("images/6.png"))); Button bt7 = new Button("", new ImageView(new Image("images/7.png"))); Button bt8 = new Button("", new ImageView(new Image("images/8.png"))); Button bt9 = new Button("", new ImageView(new Image("images/9.png"))); Button btAdd = new Button("", new ImageView(new Image("images/ADD.png"))); Button btMinus = new Button("", new ImageView(new Image("images/MINUS.png"))); Button btMultiply = new Button("", new ImageView(new Image("images/MULTIPLY.png"))); Button btDivide = new Button("", new ImageView(new Image("images/DIVIDE.png"))); Button btEqual = new Button("", new ImageView(new Image("images/EQUAL.png"))); Button btLeft = new Button("", new ImageView(new Image("images/LEFT_PAREN.png"))); Button btRight = new Button("", new ImageView(new Image("images/RIGHT_PAREN.png"))); Button btPoint = new Button("", new ImageView(new Image("images/POINT.png"))); Button btClear = new Button("", new ImageView(new Image("images/CLEAR.png"))); Button btBack = new Button("", new ImageView(new Image("images/BACK.png"))); // 因为BorderPane最多只能有三水平行，所以用一个BorderPane作为主面板 // 再用两个BorderPane嵌入到主面板中，这两个BorderPane正好可以装满所有要用到的子节点 BorderPane pane = new BorderPane(); // 主面板，用来放pane1，pane2 BorderPane pane1 = new BorderPane(); // 放琐碎的Node的pane1 BorderPane pane2 = new BorderPane(); // 放琐碎的Node的pane2 // Hbox1 Hbox2 Hbox3放到pane1中 HBox hBox1 = new HBox(5); HBox hBox2 = new HBox(5); HBox hBox3 = new HBox(5); // Hbox4,5,6放到pane2中 HBox hBox4 = new HBox(5); HBox hBox5 = new HBox(5); HBox hBox6 = new HBox(5); // 显示输入的文本框 TextField showExpression = new TextField(); showExpression.setPrefSize(280, 40); /* * 下面开始放pane1中的节点， */ hBox1.getChildren().add(showExpression); hBox2.getChildren().addAll(btClear, btBack, btPoint, btDivide); hBox3.getChildren().addAll(bt7, bt8, bt9, btMultiply); hBox1.setPadding(new Insets(15, 15, 0, 27)); hBox2.setPadding(new Insets(15, 15, 0, 30)); hBox3.setPadding(new Insets(15, 15, 5, 30)); pane1.setTop(hBox1); pane1.setCenter(hBox2); pane1.setBottom(hBox3); // 接着把pane1放到pane的top中 pane.setTop(pane1); /* * 下面开始放pane2中的节点 */ // 运行过程中发现左右括号的图片太小了，不太美观，调整一下 btLeft.setPadding(new Insets(11, 11, 11, 5)); btRight.setPadding(new Insets(11, 11, 11, 5)); hBox4.getChildren().addAll(bt4, bt5, bt6, btMinus); hBox5.getChildren().addAll(bt1, bt2, bt3, btAdd); hBox6.getChildren().addAll(bt0, btLeft, btRight, btEqual); hBox4.setPadding(new Insets(15, 15, 0, 30)); hBox5.setPadding(new Insets(15, 15, 0, 30)); hBox6.setPadding(new Insets(15, 15, 10, 30)); pane2.setTop(hBox4); pane2.setCenter(hBox5); pane2.setBottom(hBox6); // 接着把pane1放到pane的Center中 pane.setCenter(pane2); /*为每一个按钮《添加事件》 * 下面开始对每个按钮添加事件 * 即bt变量按钮设置一个事件，重写handle逻辑操作代码，获取到对应的值 * showExpression.setText(string); 设置值为（字符串）当你点击button2的时候，button2的内容会变成Accepted。到时候调用js引擎对字符串进行eval（）操作 * */ //下面开始对每个按钮添加事件 bt1.setOnAction(new EventHandler<ActionEvent>() { //重写handle方法 @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "1"; showExpression.setText(string); } }); bt2.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "2"; showExpression.setText(string); } }); bt3.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "3"; showExpression.setText(string); } }); bt4.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "4"; showExpression.setText(string); } }); bt5.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "5"; showExpression.setText(string); } }); bt6.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "6"; showExpression.setText(string); } }); bt7.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "7"; showExpression.setText(string); } }); bt8.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "8"; showExpression.setText(string); } }); bt9.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "9"; showExpression.setText(string); } }); bt0.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "0"; showExpression.setText(string); } }); btLeft.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "("; showExpression.setText(string); } }); btRight.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += ")"; showExpression.setText(string); } }); btPoint.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "."; showExpression.setText(string); } }); btBack.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string = string.substring(0, string.length() - 1); showExpression.setText(string); } }); btAdd.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "+"; showExpression.setText(string); } }); btMinus.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "-"; showExpression.setText(string); } }); btMultiply.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "*"; showExpression.setText(string); } }); btDivide.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { String string = new String(showExpression.getText()); string += "/"; showExpression.setText(string); } }); btClear.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { showExpression.setText(""); } }); /* * 使用JS计算引擎得出结果 */ btEqual.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine SE = manager.getEngineByName("js"); String string = new String(showExpression.getText()); try { String ans = SE.eval(string).toString(); showExpression.setText(ans); } catch (Exception e) { // TODO: handle exception showExpression.setText("ERROR!"); } } }); Scene scene = new Scene(pane); primaryStage.setTitle("Calculator"); primaryStage.setScene(scene); primaryStage.show(); }
ScriptEngineManager(); ScriptEngine SE = manager.getEngineByName("js"); String string = new String(showExpression.getText()); try { String ans = SE.eval(string).toString(); showExpression.setText(ans); } catch (Exception e) { // TODO: handle exception showExpression.setText("ERROR!"); } } });
