Java教程
JavaFX、计算贷款界面和计算能量界面转换（Java8版本）
本文主要是介绍JavaFX、计算贷款界面和计算能量界面转换（Java8版本），对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
package pack2;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;
public class LoanAndEnergy extends Application {
private TextField n1 = new TextField();
private TextField n2 = new TextField();
private TextField n3 = new TextField();
private TextField n4 = new TextField();
private TextField n5 = new TextField();
private Button switchToWater = new Button("Switch");
private Button switchToLoan = new Button("Switch");
private BorderPane pane = new BorderPane();
@Override
public void start(Stage primaryStage) throws Exception {//---
pane.setCenter(getComputeLoan());
pane.setBottom(switchToWater);
pane.setStyle("-fx-background-color: grey; ");
BorderPane.setAlignment(switchToWater, Pos.CENTER);
BorderPane.setAlignment(switchToLoan, Pos.CENTER);
n1.setAlignment(Pos.BOTTOM_RIGHT); //设置对齐为底部右对齐
n2.setAlignment(Pos.BOTTOM_RIGHT);
n3.setAlignment(Pos.BOTTOM_RIGHT);
n4.setAlignment(Pos.BOTTOM_RIGHT);
n5.setAlignment(Pos.BOTTOM_RIGHT);
n4.setEditable(false); //设置为不可编辑
n5.setEditable(false);
switchToWater.setOnAction(e->switchToWater()); //注册了switchToWater()方法
switchToLoan.setOnAction(e->switchToLoan()); //注册了switchToLoan()方法
Scene scene = new Scene(pane,420,350);
primaryStage.setTitle("Calculator");
primaryStage.setScene(scene);
primaryStage.setResizable(false); //设置舞台大小不可改变
primaryStage.show();
}//---
//转换成计算能量界面方法
private void switchToWater() {
pane.setCenter(getComputeWater()); //设置中部为计算能量界面
pane.setBottom(switchToLoan); //设置底部为转向贷款界面的按钮
}
//转换成计算贷款界面方法
private void switchToLoan() {
pane.setCenter(getComputeLoan()); //设置中部为计算贷款界面
pane.setBottom(switchToWater); //设置底部为转向能量界面的按钮
}
//返回计算能量界面方法
private BorderPane getComputeWater() {
GridPane gridPane = new GridPane();
Button calculateWater = new Button("Calculate");
Button resetWater = new Button("Reset");
gridPane.setStyle("-fx-hgap: 25; -fx-vgap: 5; -fx-alignment: center; -fx-background-color: beige; ");
gridPane.addColumn(0, new Label("Weight of Water(kg):"),new Label("Initial Temperature(℃):"),
new Label("Final Temperature(℃):"),new Label("Energy Needed(KJ):"),resetWater);
gridPane.addColumn(1, n1,n2,n3,n4,calculateWater);
GridPane.setHalignment(resetWater, HPos.RIGHT);
resetWater.setOnAction(e->new ComputeWater().reset(n1,n2,n3,n4));
calculateWater.setOnAction(e->new ComputeWater().computePower(n1,n2,n3,n4));
Label label = new Label(" 计算能量\n------------------");
label.setFont(Font.font("华文中宋", FontWeight.BOLD, 44));
label.setTextFill(Color.WHITESMOKE);
BorderPane borderPane = new BorderPane(gridPane);
borderPane.setStyle("-fx-background-color: grey; ");
borderPane.setTop(label);
BorderPane.setAlignment(borderPane.getTop(), Pos.BOTTOM_CENTER);
return borderPane;
}
//返回计算贷款界面方法
private BorderPane getComputeLoan() {
GridPane pane = new GridPane();
Button calculateLoan = new Button("Calculate");
Button resetLoan = new Button("Reset");
pane.setStyle("-fx-hgap: 25; -fx-vgap: 5; -fx-alignment: center; -fx-background-color: beige; ");
pane.addColumn(0, new Label("Annual Interest Rate:"),new Label("Number of Years:"),
new Label("Loan Amount:"),new Label("Monthly Payment:"),new Label("Total Payment:"),resetLoan);
pane.addColumn(1, n1,n2,n3,n4,n5,calculateLoan);
GridPane.setHalignment(resetLoan, HPos.RIGHT);
resetLoan.setOnAction(e->new ComputeWater().reset(n1, n2, n3, n4, n5));
calculateLoan.setOnAction(e->new Loan().computeLoan(n1, n2, n3, n4, n5));
Label label = new Label(" 计算贷款\n------------------");
label.setFont(Font.font("华文中宋", FontWeight.BOLD, 44));
label.setTextFill(Color.WHITESMOKE);
BorderPane borderPane = new BorderPane(pane);
borderPane.setStyle("-fx-background-color: grey; ");
borderPane.setTop(label);
BorderPane.setAlignment(borderPane.getTop(), Pos.BOTTOM_CENTER);
return borderPane;
}
public static void main(String[] args) {
launch(args);
}
}
package pack2;
import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.stage.Stage;
/**
* 计算水从初始温度加热到最终温度所需的能量（能量（千焦） = 水的重量（kg）*（最终温度-初始温度）*4184）
* 本程序共创建了两个面板--GridPane、BorderPane.
* GridPane用于存放 标签 及 文本域 以及 按钮 .
* BorderPane存放 GridPane 和一个 Label标签，其中GridPane放于中间，Label标签放于顶部
* 本程序中的两个按钮分别注册了 ActionEvent 事件.reset按钮注册了 reset函数 ，
* calculate按钮注册了 computePower函数 .两个按钮均使用了lambda表达式.
* */
public class ComputeWater extends Application {
private TextField weightOfWater = new TextField();
private TextField startTemperature = new TextField();
private TextField endTemperature = new TextField();
private TextField powerNeeded = new TextField();
private Button calculate = new Button("Calculate");
private Button reset = new Button("Reset");
@Override
public void start(Stage primaryStage) throws Exception {
GridPane pane = new GridPane();
pane.setStyle("-fx-hgap: 25; -fx-vgap: 5; -fx-alignment: center; ");
pane.addColumn(0, new Label("Weight of Water(kg):"),new Label("Initial Temperature:"),
new Label("Final Temperature:"),new Label("Energy Needed(KJ):"),reset);
pane.addColumn(1, weightOfWater,startTemperature,endTemperature,powerNeeded,calculate);
GridPane.setHalignment(calculate, HPos.LEFT);
GridPane.setHalignment(reset, HPos.RIGHT);
weightOfWater.setAlignment(Pos.BOTTOM_RIGHT);
startTemperature.setAlignment(Pos.BOTTOM_RIGHT);
endTemperature.setAlignment(Pos.BOTTOM_RIGHT);
powerNeeded.setAlignment(Pos.BOTTOM_RIGHT);
powerNeeded.setEditable(false);
reset.setOnAction(e->reset());
calculate.setOnAction(e->computePower());
Label label = new Label(" 计算能量\n------------------");
label.setFont(Font.font("华文中宋", FontWeight.BOLD, 44));
label.setTextFill(Color.DARKGREY);
BorderPane borderPane = new BorderPane(pane);
borderPane.setStyle("-fx-background-color: beige; ");
borderPane.setTop(label);
BorderPane.setAlignment(borderPane.getTop(), Pos.BOTTOM_CENTER);
Scene scene = new Scene(borderPane,420,350);
primaryStage.setTitle("Compute Energy");
primaryStage.setScene(scene);
primaryStage.setResizable(false); //设置是否可改变大小
primaryStage.show();
}
//Reset all of the text field
private void reset() {
startTemperature.setText(null);
endTemperature.setText(null);
weightOfWater.setText(null);
powerNeeded.setText(null);
}
public void reset(TextField...textField) {
for (TextField textField2 : textField) {
textField2.setText(null);
}
}
//Compute the energy needed heating the water
private void computePower(){
try {
double start = Double.parseDouble(startTemperature.getText());
double end = Double.parseDouble(endTemperature.getText());
double weight = Double.parseDouble(weightOfWater.getText());
double power = weight*(end-start)*4184;
powerNeeded.setText(String.format("%.2fKJ", power));
}catch(NumberFormatException ex) {
//Do not process when text field is null among three above
}
catch(NullPointerException ex) {
//Do not any process when text field is null
}
}
public void computePower(TextField n1, TextField n2, TextField n3, TextField n4){
try {
double weight = Double.parseDouble(n1.getText());
double start = Double.parseDouble(n2.getText());
double end = Double.parseDouble(n3.getText());
double power = weight*(end-start)*4184;
n4.setText(String.format("%.2fKJ", power));
}catch(NumberFormatException ex) {
//Do not any process when text field is null among three above
}
catch(NullPointerException ex) {
//Do not any process when text field is null
}
}
public static void main(String[] args) {
launch(args);
}
}
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