Java 高级程序设计：作业 04
Java 高级程序设计：实验四 事件驱动编程
代码地址：Github
实验目的和要求
-
掌握匿名类相关知识。
-
能够使用事件处理机制。
-
能够使用lambda表达式简化事件处理。
实验内容
利用JavaFX编写一个简单计算器功能。
calculator.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="600.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.owem.experiment04.CalculatorController">
<center>
<BorderPane prefHeight="200.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<top>
<GridPane prefHeight="80.0" prefWidth="600.0" BorderPane.alignment="CENTER">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button mnemonicParsing="false" onAction="#OnBackspaceButton" prefHeight="126.0" prefWidth="200.0" text="Backspace" textFill="RED">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnCEButton" prefHeight="123.0" prefWidth="200.0" text="CE" textFill="RED" GridPane.columnIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnCButton" prefHeight="139.0" prefWidth="200.0" text="C" textFill="RED" GridPane.columnIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
</children>
</GridPane>
</top>
<center>
<GridPane BorderPane.alignment="CENTER">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button mnemonicParsing="false" onAction="#OnSevenButton" prefHeight="184.0" prefWidth="234.0" text="7" textFill="#0011ff">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnEightButton" prefHeight="185.0" prefWidth="226.0" text="8" textFill="#0011ff" GridPane.columnIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnNineButton" prefHeight="195.0" prefWidth="235.0" text="9" textFill="#0011ff" GridPane.columnIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnDivideButton" prefHeight="199.0" prefWidth="228.0" text="/" textFill="RED" GridPane.columnIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnSqrtButton" prefHeight="170.0" prefWidth="171.0" text="sqrt" textFill="#0011ff" GridPane.columnIndex="4">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnFourButton" prefHeight="177.0" prefWidth="231.0" text="4" textFill="#0011ff" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnFiveButton" prefHeight="188.0" prefWidth="192.0" text="5" textFill="#0011ff" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnSixButton" prefHeight="184.0" prefWidth="184.0" text="6" textFill="#0011ff" GridPane.columnIndex="2" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnMultiplicationButton" prefHeight="173.0" prefWidth="178.0" text="*" textFill="RED" GridPane.columnIndex="3" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnPercentButton" prefHeight="155.0" prefWidth="186.0" text="\%" textFill="#0011ff" GridPane.columnIndex="4" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnThreeButton" prefHeight="140.0" prefWidth="193.0" text="3" textFill="#0011ff" GridPane.rowIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnTwoButton" prefHeight="172.0" prefWidth="195.0" text="2" textFill="#0011ff" GridPane.columnIndex="1" GridPane.rowIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnOneButton" prefHeight="160.0" prefWidth="206.0" text="1" textFill="#0011ff" GridPane.columnIndex="2" GridPane.rowIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnSubtractButton" prefHeight="145.0" prefWidth="180.0" text="-" textFill="RED" GridPane.columnIndex="3" GridPane.rowIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnOneOfButton" prefHeight="160.0" prefWidth="156.0" text="1/x" textFill="#0011ff" GridPane.columnIndex="4" GridPane.rowIndex="2">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnZeroButton" prefHeight="129.0" prefWidth="206.0" text="0" textFill="#0011ff" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnPositiveOrNegativeButton" prefHeight="151.0" prefWidth="189.0" text="+/-" textFill="#0011ff" GridPane.columnIndex="1" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnPointButton" prefHeight="176.0" prefWidth="184.0" text="." textFill="#0011ff" GridPane.columnIndex="2" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnPlusButton" prefHeight="165.0" prefWidth="169.0" text="+" textFill="RED" GridPane.columnIndex="3" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
<Button mnemonicParsing="false" onAction="#OnEqualButton" prefHeight="216.0" prefWidth="226.0" text="=" textFill="RED" GridPane.columnIndex="4" GridPane.rowIndex="3">
<font>
<Font name="System Bold" size="30.0" />
</font>
</Button>
</children>
</GridPane>
</center>
</BorderPane>
</center>
<top>
<Label fx:id="numberText" alignment="CENTER_RIGHT" contentDisplay="CENTER" prefHeight="75.0" prefWidth="881.0" text="0" textAlignment="RIGHT" BorderPane.alignment="CENTER">
<font>
<Font size="30.0" />
</font>
</Label>
</top>
</BorderPane>
CalculatorApplication.java
package com.owem.experiment04;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
public class CalculatorApplication extends Application {
@Override
public void start(Stage stage) throws IOException {
FXMLLoader fxmlLoader = new FXMLLoader(CalculatorApplication.class.getResource("calculator.fxml"));
Scene scene = new Scene(fxmlLoader.load());
stage.setTitle("简易计算器");
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch();
}
}
CalculatorController.java
package com.owem.experiment04;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
public class CalculatorController {
@FXML
private Label numberText;
double perNumber = 0;
String operation = "";
@FXML
protected void OnBackspaceButton() {
String str = numberText.getText();
if (str.charAt(0) == '=') {
str = "0";
} else {
str = str.substring(0, str.length() - 1);
if (str.length() == 0) {
str = "0";
} else if (str.charAt(str.length() - 1) == '.') {
str = str.substring(0, str.length() - 1);
}
}
numberText.setText(str);
}
@FXML
protected void OnCEButton() {
numberText.setText("0");
perNumber = 0;
}
@FXML
protected void OnCButton() {
numberText.setText("0");
}
@FXML
protected void OnSevenButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "7";
numberText.setText(str);
}
@FXML
protected void OnEightButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "8";
numberText.setText(str);
}
@FXML
protected void OnNineButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "9";
numberText.setText(str);
}
@FXML
protected void OnDivideButton() {
perNumber = Double.parseDouble(numberText.getText());
operation = "/";
numberText.setText("");
}
@FXML
protected void OnSqrtButton() {
double number = Double.parseDouble(numberText.getText());
numberText.setText("=" + Math.sqrt(number));
}
@FXML
protected void OnFourButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "4";
numberText.setText(str);
}
@FXML
protected void OnFiveButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "5";
numberText.setText(str);
}
@FXML
protected void OnSixButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "6";
numberText.setText(str);
}
@FXML
protected void OnMultiplicationButton() {
perNumber = Double.parseDouble(numberText.getText());
operation = "*";
numberText.setText("");
}
@FXML
protected void OnPercentButton() {
double number = Double.parseDouble(numberText.getText());
if (number != 0) {
numberText.setText(String.valueOf(number / 100));
}
}
@FXML
protected void OnThreeButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "3";
numberText.setText(str);
}
@FXML
protected void OnTwoButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "2";
numberText.setText(str);
}
@FXML
protected void OnOneButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "1";
numberText.setText(str);
}
@FXML
protected void OnSubtractButton() {
perNumber = Double.parseDouble(numberText.getText());
operation = "-";
numberText.setText("");
}
@FXML
protected void OnOneOfButton() {
if (numberText.getText().charAt(0) != '=') {
double number = Double.parseDouble(numberText.getText());
if (number != 0) {
numberText.setText("=" + 1 / number);
}
}
}
@FXML
protected void OnZeroButton() {
String str = numberText.getText();
if (str.equals("0") || (!str.equals("") && str.charAt(0) == '=')) {
str = "";
}
str = str + "0";
numberText.setText(str);
}
@FXML
protected void OnPositiveOrNegativeButton() {
String str = numberText.getText();
if (!str.equals("0")) {
if (numberText.getText().contains("-")) {
numberText.setText(str.substring(1));
} else {
numberText.setText("-" + str);
}
}
}
@FXML
protected void OnPointButton() {
if (!numberText.getText().contains(".")) {
numberText.setText(numberText.getText() + ".");
}
}
@FXML
protected void OnPlusButton() {
perNumber = Double.parseDouble(numberText.getText());
operation = "+";
numberText.setText("");
}
@FXML
protected void OnEqualButton() {
double number = Double.parseDouble(numberText.getText());
switch (operation) {
case "+" -> number = perNumber + number;
case "-" -> number = perNumber - number;
case "*" -> number = perNumber * number;
case "/" -> {
if (number != 0) {
number = perNumber / number;
}
}
}
numberText.setText("=" + number);
}
}
本文是原创文章，采用 CC BY-NC-ND 4.0 协议，完整转载请注明来自 Owen
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