在JAVA（选项窗口）中无法从子代返回父级的变量 [英] Cannot get variable from Child back to Parent in JAVA (Options Window)

问题描述

开始 - 3:00 PM

更新1 - 5:36

）class：

  private void cmdApplyActionPerformed（java.awt.event.ActionEvent evt）{
 // TODO add your在这里处理代码：
 
 hud.setTime（btnTxtTime）; 
 hud.setTemp（btnTxtTemp）; 
 hud.setSurface（btnTxtSurface）; 
 hud.setWeather（btnTxtWeather）; 
 hud.setRadiation（btnTxtRadiation）; 
 dispose（）; 
 
 
} 
  

）类。

  public class选项extends javax.swing.JFrame {
 
 public String btnTxtTime; 
 public String btnTxtTemp; 
 public String btnTxtSurface; 
 public String btnTxtWeather; 
 public String btnTxtRadiation; 
 public static boolean ApplyClicked; 
 
 / ** 
 *创建新表单简介
 * / 
 
私人HUD hud; 
 
 public Options（HUD hud）{
 initComponents（）; 
 this.hud = hud; 
 
 
} 
  

这是Option class：

  public String getTime（）{
 
 if（Day.equals（grpTimeOfDay。 getSelection（）））{
 btnTxtTime =Day; 
 return this.btnTxtTime; 
} 
 
 if（Night.equals（grpTimeOfDay.getSelection（）））{
 btnTxtTime =Night; 
 return this.btnTxtTime; 
} 
 return null; 
 
} 
  

这是如何从HUD ）：

  private void cmdOptionsActionPerformed（java.awt.event.ActionEvent evt）{
 // TODO添加您的处理代码这里：
 
选项o =新选项（hud）; 
 this.getLocation（p）; 
 o.setLocation（（int）p.getX（）+ 100，（int）p.getY（）+ 100）; 
 o.setVisible（true）; 
} 
  

这是我的HUD（）类的开始：

  public abstract class HUD extends javax.swing.JFrame implements Runnable {
 
 
 private Options o; 
 private HUD hud; 
 
 public HUD（Options o）{
 
 
 initComponents（）; 
 this.o = o; 
  

这是HUD（）的方法，它从Options（）获取JButtons的值：

  public void setTime（String strTime）{
 
 strTime = o.getTime 
 txtTime.setText（strTime）;但是每当我单击应用，选项（）中设置的选项不是然后（），然后选择（）设置在TextFields中显示它们在HUD（）就像他们应该是：/ 
解决方案
从我的理解，HUD是你的
 
 
 
但是当你应用的时候，你正在设置一个 new 
 em> HUD，而不是您之前使用过的。
 
 
 
要解决这个问题，您需要在配置窗口中使用主窗口的句柄，以便可以设置属性
  ConfigFrame config = new ConfigFrame（）; 
 config.setHUD（this）; 
 config.setVisible（true）; 
  
在您的配置中
  private HUD hud; 
 
 public void setHUD（HUD hud）{
 this.hud = hud; 
} 
  
那么只要省略 HUD hud = new hud （）;  
 
STARTED - 3:00PM

UPDATE 1 - 5:36PM

Apply Button in the Option() class:
     private void cmdApplyActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // TODO add your handling code here:

    hud.setTime(btnTxtTime);
    hud.setTemp(btnTxtTemp);
    hud.setSurface(btnTxtSurface);
    hud.setWeather(btnTxtWeather);
    hud.setRadiation(btnTxtRadiation);
    dispose();


}  
This is a section of the Option() Class.
    public class Options extends javax.swing.JFrame {

public String btnTxtTime;
public String btnTxtTemp;
public String btnTxtSurface;
public String btnTxtWeather;
public String btnTxtRadiation;
public static boolean ApplyClicked;

/**
 * Creates new form Profile
 */

private HUD hud;

public Options(HUD hud) {
    initComponents();
    this.hud = hud;


}
This is a method in Option() class:
    public String getTime() {

    if ("Day".equals(grpTimeOfDay.getSelection())) {
        btnTxtTime = "Day";
        return this.btnTxtTime;
    }

    if ("Night".equals(grpTimeOfDay.getSelection())) {
        btnTxtTime = "Night";
        return this.btnTxtTime;
    }
    return null;

}
This is how Options() is openned from within HUD():
     private void cmdOptionsActionPerformed(java.awt.event.ActionEvent evt) {                                           
    // TODO add your handling code here:

   Options o = new Options(hud);
    this.getLocation(p);
    o.setLocation((int) p.getX() + 100, (int) p.getY() + 100);
    o.setVisible(true);
}        
This is the start of my HUD() Class:
    public abstract class HUD extends javax.swing.JFrame implements Runnable {


private Options o;
 private HUD hud;

public HUD(Options o) {


    initComponents();
    this.o = o;
and this is the method from HUD() which gets the value of the JButtons from Options():
       public void setTime(String strTime) {

    strTime = o.getTime();
    txtTime.setText(strTime);
}
However whenever I click Apply, the options set in Options() are not then set in the TextFields that display them in HUD() like they should be :/
解决方案
From what I understand, HUD is your 'main window' and the users gets to this option frame from that window.

But when you apply, you're setting the properties on a new HUD, not the one you had before.

To fix this, you need a handle to your main window in your config window, so that you can set the properties on it.

in your hud:
ConfigFrame config = new ConfigFrame();
config.setHUD(this);
config.setVisible(true);
In your config
private HUD hud;

public void setHUD(HUD hud){
   this.hud = hud;
}
then just leave out the HUD hud = new hud();

                        
这篇关于在JAVA（选项窗口）中无法从子代返回父级的变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！