Question

因此，我一直在为学校项目开发一款小型游戏（只是从Swing GUI开始），并且我有一个名为Background的类，除非在设置菜单中更改分辨率，否则该类将一直保持打开状态。

在设置菜单中，创建具有新分辨率的Background类的新实例。

问题是，我不确定这样做时如何处置旧的Background实例。

这是背景类：

package hangman;

import java.awt.Dimension;
import java.awt.Toolkit;
import java.util.Scanner;
import javax.swing.JFrame;

public class Background extends javax.swing.JFrame {
    private int width = 1920;
    private int height = 1080;
    private String resolution;
    private String screenSize;

    public Background(String constrScreenSize) {
        initComponents();
        screenSize = constrScreenSize;
        getDefaultRes();

        if(screenSize.equals("Fullscreen")) {
            setToFullscreen();
        }
        else {
            setToWindowed();
        }
    }

    public Background(String constrScreenSize, String constrResolution) {
        initComponents();
        screenSize = constrScreenSize;
        resolution = constrResolution;
        parseResolution(resolution);

        if(screenSize.equals("Fullscreen")) {
            setToFullscreen();
        }
        else {
            setToWindowed();
        }
    }

    public Background() {
        initComponents();
        setToFullscreen();
    }

    //Sets the size of the background to exactly the size of the screen
    public void setToFullscreen() {
        dispose();
    setExtendedState(JFrame.MAXIMIZED_BOTH);
        setUndecorated(true);
    }

    public void setToWindowed() {
        dispose();
        setSize(width, height);
        setUndecorated(false);
    }

    public void parseResolution(String res) {
        Scanner scanRes = new Scanner(res).useDelimiter(" ");
        width = scanRes.nextInt();
        scanRes.next();
        height = scanRes.nextInt();
    }

    public void getDefaultRes() {
        Dimension screenDimension = Toolkit.getDefaultToolkit().getScreenSize();
        width = (int) screenDimension.getWidth();
        height = (int) screenDimension.getHeight();
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new Background().setVisible(true);
        }
    });
}

然后我在 Settings类

中调用其构造函数

private void acceptSettingsButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                     
    new Background(screenSizeSettingComboBox.getSelectedItem().toString(), resolutionSettingComboBox.getSelectedItem().toString()).setVisible(true);
}

很显然，这随后创建了所述Background类的新实例。问题是，我现在只剩下两个实例，而我只想要一个新实例。

最简单的方法是什么？

感谢您的帮助。

处置另一个类的JFrame

0 个答案: