嘿，我是java的初学者，我只是在短时间内这样做，无论如何我最后的java基础项目我需要用gui制作一个简单的计算器，我认为它赢了'是那么难，但我有点不对劲：P我已经设法做了最多（我认为），但我坚持与事件处理操作和设置值计算，这是我的代码，你能不能给我关于如何做的建议或提示：D
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.value.WritableObjectValue;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;
public class Calculator extends Application {
private DoubleProperty value = new SimpleDoubleProperty();
@Override
public void start(Stage primaryStage) {
FlowPane pane = new FlowPane();
pane.setAlignment(Pos.CENTER);
pane.setPadding(new Insets ( 30 , 20 , 30 , 20));
pane.setHgap(5);
pane.setVgap(5);
pane.setMinWidth(400);
pane.setPrefWidth(400);
pane.setMaxWidth(400);
TextField Rezultat = new TextField();
Rezultat.setEditable(false);
Rezultat.setAlignment(Pos.CENTER);
Rezultat.setMinSize(336, 40);
Rezultat.textProperty().bind(Bindings.format("%.0f" , value));
pane.getChildren().add(Rezultat);
Button sedmica = new Button("7");
Button osmica = new Button("8");
Button devetka = new Button("9");
Button plus = new Button("+");
sedmica.setMinSize(80, 80);
osmica.setMinSize(80, 80);
devetka.setMinSize(80, 80);
plus.setMinSize(80, 80);
pane.getChildren().add(sedmica);
sedmicaHandler handler7 = new sedmicaHandler();
sedmica.setOnAction(handler7);
pane.getChildren().add(osmica);
osmicaHandler handler8 = new osmicaHandler();
osmica.setOnAction(handler8);
pane.getChildren().add(devetka);
devetkaHandler handler9 = new devetkaHandler();
devetka.setOnAction(handler9);
pane.getChildren().add(plus);
plusHandler handlerplus = new plusHandler();
plus.setOnAction(handlerplus);
Button cetvorka = new Button("4");
Button petica = new Button("5");
Button sestica = new Button("6");
Button minus = new Button("-");
cetvorka.setMinSize(80, 80);
petica.setMinSize(80, 80);
sestica.setMinSize(80, 80);
minus.setMinSize(80, 80);
pane.getChildren().add(cetvorka);
cetvorkaHandler handler4 = new cetvorkaHandler();
cetvorka.setOnAction(handler4);
pane.getChildren().add(petica);
peticaHandler handler5 = new peticaHandler();
petica.setOnAction(handler5);
pane.getChildren().add(sestica);
sesticaHandler handler6 = new sesticaHandler();
sestica.setOnAction(handler6);
pane.getChildren().add(minus);
minusHandler handlerminus = new minusHandler();
minus.setOnAction(handlerminus);
Button trica = new Button("3");
Button dvica = new Button("2");
Button jedinica = new Button("1");
Button puta = new Button("*");
trica.setMinSize(80, 80);
dvica.setMinSize(80, 80);
jedinica.setMinSize(80, 80);
puta.setMinSize(80, 80);
pane.getChildren().add(jedinica);
jedinicaHandler handler1 = new jedinicaHandler();
jedinica.setOnAction(handler1);
pane.getChildren().add(dvica);
dvicaHandler handler2 = new dvicaHandler();
dvica.setOnAction(handler2);
pane.getChildren().add(trica);
tricaHandler handler3 = new tricaHandler();
trica.setOnAction(handler3);
pane.getChildren().add(puta);
putaHandler handlerputa = new putaHandler();
puta.setOnAction(handlerputa);
Button nula = new Button("0");
Button jednako = new Button("=");
Button podijeljeno = new Button("/");
Button EE = new Button ("EE");
nula.setMinSize(80, 80);
jednako.setMinSize(80, 80);
podijeljeno.setMinSize(80, 80);
EE.setMinSize(80, 80);
pane.getChildren().add(EE);
EEHandler handlerEE = new EEHandler();
EE.setOnAction(handlerEE);
pane.getChildren().add(nula);
nulaHandler handler0 = new nulaHandler();
nula.setOnAction(handler0);
pane.getChildren().add(jednako);
jednakoHandler handlerjednako = new jednakoHandler();
jednako.setOnAction(handlerjednako);
pane.getChildren().add(podijeljeno);
podijeljenoHandler handlerpodijeljeno = new podijeljenoHandler();
podijeljeno.setOnAction(handlerpodijeljeno);
Scene scene = new Scene(pane);
primaryStage.setTitle("Calculator");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main (String[] args) {
Application.launch(args);
}
}
class nulaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
value.set(0);
}
}
class jedinicaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("1");
}
}
class dvicaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("2");
}
}
class tricaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("3");
}
}
class cetvorkaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("4");
}
}
class peticaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("5");
}
}
class sesticaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("6");
}
}
class sedmicaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("7");
}
}
class osmicaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("8");
}
}
class devetkaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("9");
}
}
class plusHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("+");
}
}
class minusHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("-");
}
}
class putaHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("*");
}
}
class podijeljenoHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("/");
}
}
class jednakoHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("=");
}
}
class EEHandler implements EventHandler<ActionEvent>{
@Override
public void handle(ActionEvent e){
System.out.println("EE");
}
}
我的处理程序只是基本的，他们将数字打印到控制台，所以你可以忽略它们，我看到一些带有value.set命令的例子我应该和它们一起使用还是？请帮助截止日期为2周。非常感谢
答案 0 :(得分：0)
我不会为你做功课，只是提示一些：
想想按下按钮时你预期会发生什么：
你为每个按钮做了几乎相同的事情。（或者至少10个按钮你有相同的逻辑） 你可以循环创建你的应用程序：
public class Calculator extends Application {
private TextField textField = new TextField();
@Override
public void start(Stage primaryStage) {
List<String> buttons = Arrays.asList("7", "8", "9", "+", "4", "5", "6", "-", "1", "2", "3", "*", "0", "=", "/", "EE");
FlowPane pane = new FlowPane();
pane.setAlignment(Pos.CENTER);
pane.setPadding(new Insets(30, 20, 30, 20));
pane.setHgap(5);
pane.setVgap(5);
pane.setMinWidth(400);
pane.setPrefWidth(400);
pane.setMaxWidth(400);
textField.setEditable(false);
textField.setAlignment(Pos.CENTER);
textField.setMinSize(336, 40);
// Rezultat.textProperty().bind(Bindings.format("%.0f", value));
pane.getChildren().add(textField);
for (String button : buttons) {
Button b = new Button(button);
b.setMinSize(80, 80);
pane.getChildren().add(b);
b.setOnAction((e) -> doSomething(b.getText()));
}
Scene scene = new Scene(pane);
primaryStage.setTitle("Calculator");
primaryStage.setScene(scene);
primaryStage.show();
}
private void doSomething(String text) {
if (text.equalsIgnoreCase("=")) {
// Calc
}
else if (text.equalsIgnoreCase("EE")) {
// EE
} else if (text.equalsIgnoreCase("+") || text.equalsIgnoreCase("-") || text.equalsIgnoreCase("*") || text.equalsIgnoreCase("/")) {
// + - * /
}
// ....
else {
// numeric
textField.appendText(text);
}
}
public static void main(String[] args) {
Application.launch(args);
}
}
答案 1 :(得分：-1)
公共类View扩展了Application {
public static void main(String[] args) {
launch(args);
}
public void start(Stage primaryStage){
primaryStage.setTitle("Calculator");
GridPane root = new GridPane();
Label textBox1 = new Label("Text1");
root.add(textBox1, 0, 0, 5, 1);
Label textBox2 = new Label("Text2");
root.add(textBox2, 0, 1, 5, 1);
textBox1.setId("lblTextBox1");
textBox2.setId("lblTextBox2");
Button btn0 = new Button("0");
Button btn1 = new Button("1");
Button btn2 = new Button("2");
Button btn3 = new Button("3");
Button btn4 = new Button("4");
Button btn5 = new Button("5");
Button btn6 = new Button("6");
Button btn7 = new Button("7");
Button btn8 = new Button("8");
Button btn9 = new Button("9");
btn0.setId("btn0");
btn1.setId("btn1");
btn2.setId("btn2");
btn3.setId("btn3");
btn4.setId("btn4");
btn5.setId("btn5");
btn6.setId("btn6");
btn7.setId("btn7");
btn8.setId("btn8");
btn9.setId("btn9");
Button btnDot = new Button(".");
Button btnPlus = new Button("+");
Button btnMinus = new Button("-");
Button btnTimes = new Button("*");
Button btnDivide = new Button("/");
Button btnEquals = new Button("=");
Button btnMC = new Button("MC");
Button btnMR = new Button("MR");
Button btnMS = new Button("MS");
Button btnMPlus = new Button("M+");
Button btnMMinus = new Button("M-");
Button btnBack = new Button("<=");
Button btnCE = new Button("CE");
Button btnC = new Button("C");
Button btnPlusOrMinus = new Button("+/-");
Button btnSqrt = new Button("sqrt");
Button btnPercentage= new Button("%");
Button btn1OverX = new Button("1/x");
btnPlus.setId("btnPlus");
btnTimes.setId("btnTimes");
btnDot.setId("btnDot");
btnEquals.setId("btnEquals");
btnC.setId("btnClear");
btn0.setMaxHeight(Double.MAX_VALUE);
btn0.setMaxWidth(Double.MAX_VALUE);
btn1.setMaxHeight(Double.MAX_VALUE);
btn1.setMaxWidth(Double.MAX_VALUE);
btn2.setMaxHeight(Double.MAX_VALUE);
btn2.setMaxWidth(Double.MAX_VALUE);
btn3.setMaxHeight(Double.MAX_VALUE);
btn3.setMaxWidth(Double.MAX_VALUE);
btn4.setMaxHeight(Double.MAX_VALUE);
btn4.setMaxWidth(Double.MAX_VALUE);
btn5.setMaxHeight(Double.MAX_VALUE);
btn5.setMaxWidth(Double.MAX_VALUE);
btn6.setMaxHeight(Double.MAX_VALUE);
btn6.setMaxWidth(Double.MAX_VALUE);
btn7.setMaxHeight(Double.MAX_VALUE);
btn7.setMaxWidth(Double.MAX_VALUE);
btn8.setMaxHeight(Double.MAX_VALUE);
btn8.setMaxWidth(Double.MAX_VALUE);
btn9.setMaxHeight(Double.MAX_VALUE);
btn9.setMaxWidth(Double.MAX_VALUE);
btnEquals.setMaxHeight(Double.MAX_VALUE);
btnEquals.setMaxWidth(Double.MAX_VALUE);
btnMC.setMaxHeight(Double.MAX_VALUE);
btnMC.setMaxWidth(Double.MAX_VALUE);
btnMMinus.setMaxHeight(Double.MAX_VALUE);
btnMMinus.setMaxWidth(Double.MAX_VALUE);
btnPlusOrMinus.setMaxHeight(Double.MAX_VALUE);
btnPlusOrMinus.setMaxWidth(Double.MAX_VALUE);
btnPercentage.setMaxHeight(Double.MAX_VALUE);
btnPercentage.setMaxWidth(Double.MAX_VALUE);
btnSqrt.setMaxHeight(Double.MAX_VALUE);
btnSqrt.setMaxWidth(Double.MAX_VALUE);
btn1OverX.setMaxHeight(Double.MAX_VALUE);
btn1OverX.setMaxWidth(Double.MAX_VALUE);
btnPlus.setMaxHeight(Double.MAX_VALUE);
btnPlus.setMaxWidth(Double.MAX_VALUE);
btnMinus.setMaxHeight(Double.MAX_VALUE);
btnMinus.setMaxWidth(Double.MAX_VALUE);
btnTimes.setMaxHeight(Double.MAX_VALUE);
btnTimes.setMaxWidth(Double.MAX_VALUE);
btnDivide.setMaxHeight(Double.MAX_VALUE);
btnDivide.setMaxWidth(Double.MAX_VALUE);
btnCE.setMaxHeight(Double.MAX_VALUE);
btnCE.setMaxWidth(Double.MAX_VALUE);
btnC.setMaxHeight(Double.MAX_VALUE);
btnC.setMaxWidth(Double.MAX_VALUE);
btnDot.setMaxHeight(Double.MAX_VALUE);
btnDot.setMaxWidth(Double.MAX_VALUE);
root.add(btnMC,0,1);
root.add(btnMR,1,1);
root.add(btnMS,2,1);
root.add(btnMPlus,3,1);
root.add(btnMMinus,4,1);
root.add(btnBack,0,2);
root.add(btnCE,1,2);
root.add(btnC,2,2);
root.add(btnPlusOrMinus,3,2);
root.add(btnSqrt,4,2);
root.add(btn7,0,3);
root.add(btn8,1,3);
root.add(btn9,2,3);
root.add(btnDivide,3,3);
root.add(btnPercentage,4,3);
root.add(btn4,0,4);
root.add(btn5,1,4);
root.add(btn6,2,4);
root.add(btnTimes,3,4);
root.add(btn1OverX,4,4);
root.add(btn1,0,5);
root.add(btn2,1,5);
root.add(btn3,2,5);
root.add(btnMinus,3,5);
root.add(btnEquals,4,5,1,2);
root.add(btn0,0,6,2,1);
root.add(btnDot,2,6);
root.add(btnPlus,3,6);
root.setVgap(5);
root.setHgap(5);
root.setPadding(new Insets(5,5,5,5));
primaryStage.setScene(new Scene(root));
primaryStage.show();
Controller controller = new Controller(primaryStage.getScene());
}
}
公共类模型{
SimpleDoubleProperty totalResult = new SimpleDoubleProperty(0);
SimpleDoubleProperty curNumber = new SimpleDoubleProperty(0);
SimpleStringProperty stringDisplayed = new SimpleStringProperty();
String operatorPressed = "";
Boolean isDecimal = false;
int decimalCouter = 0;
public void plusOperator(){
calculate();
operatorPressed = "+";
}
public void calculate(){
switch (operatorPressed){
case "+" :
totalResult.set(totalResult.get()+ curNumber.get());
stringDisplayed.set(stringDisplayed.get()+" + " +curNumber.get());
break;
case "*" :
totalResult.set(totalResult.get()*curNumber.get());
stringDisplayed.set(stringDisplayed.get()+" * " +curNumber.get());
break;
default:
totalResult.set(curNumber.get());
stringDisplayed.set(curNumber.get()+"");
}
curNumber.set(0);
operatorPressed = "";
isDecimal = false;
decimalCouter = 0;
}
public void multiplyOperator(){
calculate();
operatorPressed = "*";
}
public void equalsOperator(){
calculate();
curNumber.setValue(totalResult.get());
totalResult.set(0);
}
public void clearOperator(){
totalResult.setValue(0);
curNumber.setValue(0);
stringDisplayed.set("");
decimalCouter = 0;
isDecimal = false;
}
public void pressedNumber(int number){
if(!isDecimal){
curNumber.setValue(curNumber.get()*10+number);
}
else{
decimalCouter++;
Double tempCurrentNum = curNumber.get();
tempCurrentNum = tempCurrentNum*Math.pow(10,decimalCouter);
tempCurrentNum = tempCurrentNum+number;
tempCurrentNum = tempCurrentNum*Math.pow(10,-decimalCouter);
curNumber.set(tempCurrentNum);
}
}
public void dotOperator(){
isDecimal = true;
}
}
公共类控制器{
Model newModel = new Model();
Controller(Scene scene){
Button btnPlus, btnTimes, btnEquals, btnClear, btnDot;
Label textBox1, textBox2;
for(int ii=0;ii<=9;ii++){
Button button = (Button)scene.lookup("#btn"+ii);
int finalIi = ii;
button.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
pressedNumber(finalIi);
}
});
}
btnPlus = (Button)scene.lookup("#btnPlus");
btnTimes = (Button)scene.lookup("#btnTimes");
btnEquals = (Button)scene.lookup("#btnEquals");
btnDot = (Button)scene.lookup("#btnDot");
btnClear = (Button)scene.lookup("#btnClear");
textBox1 = (Label)scene.lookup("#lblTextBox1");
textBox2 = (Label)scene.lookup("#lblTextBox2");
btnPlus.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
plusOperator();
}
});
btnTimes.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
multiplyOperator();
}
});
btnEquals.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
equalsOperator();
}
});
btnClear.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
clearOperator();
}
});
btnDot.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent event) {
dotOperator();
}
});
textBox1.textProperty().bind(newModel.stringDisplayed);
textBox2.textProperty().bind(newModel.curNumber.asString());
}
public void pressedNumber(int number){
newModel.pressedNumber(number);
}
public void plusOperator(){
newModel.plusOperator();
}
public void multiplyOperator(){
newModel.multiplyOperator();
}
public void equalsOperator(){
newModel.equalsOperator();
}
public void clearOperator(){
newModel.clearOperator();
}
public void dotOperator(){
newModel.dotOperator();
}
}