javafx 中的控制台输出和 gui 文本字段？
console output & gui textfield in javafx?
我是 javafx 的新程序员。我正在构建一个名为模糊计算器的桌面应用程序。每当我 运行 这个程序时，它都会打开一个用户界面，但是当单击界面中的按钮（Max-Min）时，我发现我的输出在控制台而不是文本字段中。如何在我创建的文本字段中获得所需的输出？？？我已经浪费了太多时间来寻找解决方案，但 none 对我来说是可行的或清楚的。
我在下面附上我的代码以征求你的建议..
N.B：由于我的应用程序正在开发中，目前所有按钮都不起作用，只有 Max-min 按钮处于活动状态。
Main.java
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Fuzzy Calculator");
primaryStage.setScene(new Scene(root, 600, 400));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller.java
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import java.util.Arrays;
import java.util.Scanner;
public class Controller {
@FXML
private Button add;
@FXML
private Button maxmin;
@FXML
private Button maxavg;
@FXML
private Button sub;
@FXML
private TextField display;
@FXML
private Button maxprod;
@FXML
private Button minmax;
@FXML
void maxmin(ActionEvent event) {
System.out.println("Array size:");
Scanner input=new Scanner(System.in);
int n=input.nextInt();
System.out.println("1st input ");
int a[][]=new int [n][n];
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
a[i][j]=input.nextInt();
}
}
System.out.println("2nd input ");
int b[][]=new int [n][n];
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
b[i][j]=input.nextInt();
}
}
int [] c=new int [n];
int [] k=new int [n];
int t=0;
for(int i=0;i<n;i++)
{
t=0;
for(int j=0;j<n;j++ )
{
if(a[i][j]<b[j][i])
{
k[t]=a[i][j];
t++;
}
else
{
k[t]=b[j][i];
t++;
}
}
Arrays.sort(k);
c[i]=k[n-1];
}
System.out.println("the output is :");
for(int i=0;i<n;i++)
{
System.out.print(" "+c[i]);
}
}
}
sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<SplitPane dividerPositions="0.5" layoutX="102.0" layoutY="51.0" orientation="VERTICAL" prefHeight="400.0" prefWidth="600.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="25.0">
<items>
<AnchorPane maxHeight="100.0" prefHeight="80.0">
<children>
<TextField fx:id="display" layoutX="150.0" layoutY="42.0" prefHeight="100.0" prefWidth="598.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<font>
<Font size="15.0" />
</font>
</TextField>
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="230.0" prefWidth="598.0">
<children>
<GridPane layoutY="6.0" prefHeight="267.0" prefWidth="598.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<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 minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="maxmin" alignment="CENTER" contentDisplay="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" onAction="#maxmin" prefHeight="134.0" prefWidth="199.0" text="Max-Min">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="maxprod" alignment="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Max_Product" GridPane.columnIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="maxavg" alignment="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Max_Average" GridPane.columnIndex="2">
<font>
<Font size="27.0" />
</font>
</Button>
<Button fx:id="add" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Addition" GridPane.rowIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="sub" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Subtraction" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="minmax" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Min-Max" GridPane.columnIndex="2" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="28.0" />
</font>
</Button>
</children>
</GridPane>
</children>
</AnchorPane>
</items>
</SplitPane>
</children>
</AnchorPane>
你的代码看起来一切正常，它按照你写的做
System.out.println("the output is :");
将打印到控制台，因为这是标准输出
你说你想打印到文本字段中，所以就这样写吧：
display.setText(display.getText()+"new text, with its value : + 65);
setText()是决定哪个文字会出现在
getText()是取回已经输入的文本，允许做拼接
因为如果你只使用 setText(); 你会得到这样的东西：
display.setText("log n°1 ...");
log n°1
display.setText("log n°2 ...");
log n°2
并且您想添加文本而不是替换它：
display.setText("log n°1 ...\n");
log n°1
display.setText(display.getText() + "log n°2 ...");
log n°1
log n°2
但这是从另一个线程更新 UI。 UI 只能从 UI 线程更新。为此，您必须这样做
Platform.runLater(() -> {
display.setText(display.getText() + "log n°2 ...");
});
它告诉 UI 线程执行任务 ;)
始终使用您用于输出的文本框或标签 class 的 settext 方法，而不是 System.out.printin()
我是 javafx 的新程序员。我正在构建一个名为模糊计算器的桌面应用程序。每当我 运行 这个程序时，它都会打开一个用户界面，但是当单击界面中的按钮（Max-Min）时，我发现我的输出在控制台而不是文本字段中。如何在我创建的文本字段中获得所需的输出？？？我已经浪费了太多时间来寻找解决方案，但 none 对我来说是可行的或清楚的。
我在下面附上我的代码以征求你的建议..
N.B：由于我的应用程序正在开发中，目前所有按钮都不起作用，只有 Max-min 按钮处于活动状态。
Main.java
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setTitle("Fuzzy Calculator");
primaryStage.setScene(new Scene(root, 600, 400));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Controller.java
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import java.util.Arrays;
import java.util.Scanner;
public class Controller {
@FXML
private Button add;
@FXML
private Button maxmin;
@FXML
private Button maxavg;
@FXML
private Button sub;
@FXML
private TextField display;
@FXML
private Button maxprod;
@FXML
private Button minmax;
@FXML
void maxmin(ActionEvent event) {
System.out.println("Array size:");
Scanner input=new Scanner(System.in);
int n=input.nextInt();
System.out.println("1st input ");
int a[][]=new int [n][n];
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
a[i][j]=input.nextInt();
}
}
System.out.println("2nd input ");
int b[][]=new int [n][n];
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
b[i][j]=input.nextInt();
}
}
int [] c=new int [n];
int [] k=new int [n];
int t=0;
for(int i=0;i<n;i++)
{
t=0;
for(int j=0;j<n;j++ )
{
if(a[i][j]<b[j][i])
{
k[t]=a[i][j];
t++;
}
else
{
k[t]=b[j][i];
t++;
}
}
Arrays.sort(k);
c[i]=k[n-1];
}
System.out.println("the output is :");
for(int i=0;i<n;i++)
{
System.out.print(" "+c[i]);
}
}
}
sample.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
<children>
<SplitPane dividerPositions="0.5" layoutX="102.0" layoutY="51.0" orientation="VERTICAL" prefHeight="400.0" prefWidth="600.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="25.0">
<items>
<AnchorPane maxHeight="100.0" prefHeight="80.0">
<children>
<TextField fx:id="display" layoutX="150.0" layoutY="42.0" prefHeight="100.0" prefWidth="598.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<font>
<Font size="15.0" />
</font>
</TextField>
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="230.0" prefWidth="598.0">
<children>
<GridPane layoutY="6.0" prefHeight="267.0" prefWidth="598.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
<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 minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<Button fx:id="maxmin" alignment="CENTER" contentDisplay="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" onAction="#maxmin" prefHeight="134.0" prefWidth="199.0" text="Max-Min">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="maxprod" alignment="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Max_Product" GridPane.columnIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="maxavg" alignment="CENTER" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Max_Average" GridPane.columnIndex="2">
<font>
<Font size="27.0" />
</font>
</Button>
<Button fx:id="add" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Addition" GridPane.rowIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="sub" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Subtraction" GridPane.columnIndex="1" GridPane.rowIndex="1">
<font>
<Font size="28.0" />
</font>
</Button>
<Button fx:id="minmax" minHeight="-Infinity" minWidth="-Infinity" mnemonicParsing="false" prefHeight="134.0" prefWidth="199.0" text="Min-Max" GridPane.columnIndex="2" GridPane.rowIndex="1">
<font>
<Font name="System Bold" size="28.0" />
</font>
</Button>
</children>
</GridPane>
</children>
</AnchorPane>
</items>
</SplitPane>
</children>
</AnchorPane>
你的代码看起来一切正常，它按照你写的做
System.out.println("the output is :");
将打印到控制台，因为这是标准输出
你说你想打印到文本字段中，所以就这样写吧：
display.setText(display.getText()+"new text, with its value : + 65);
setText()是决定哪个文字会出现在
getText()是取回已经输入的文本，允许做拼接
因为如果你只使用 setText(); 你会得到这样的东西：
display.setText("log n°1 ...");
log n°1
display.setText("log n°2 ...");
log n°2
并且您想添加文本而不是替换它：
display.setText("log n°1 ...\n");
log n°1
display.setText(display.getText() + "log n°2 ...");
log n°1
log n°2
但这是从另一个线程更新 UI。 UI 只能从 UI 线程更新。为此，您必须这样做
Platform.runLater(() -> {
display.setText(display.getText() + "log n°2 ...");
});
它告诉 UI 线程执行任务 ;)
始终使用您用于输出的文本框或标签 class 的 settext 方法，而不是 System.out.printin()