Resize JFrame in one dimension

Question

I am trying to resize my JFrame in only one dimension (width in this case), and I found this question only for JFrame heights), which gave me a good answer for this;

addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
    setSize(new Dimension(preferredWidth, getHeight()));
    super.componentResized(e);
}
}); 

and I edited it a bit so that instead of the lock width, the height was fixed to a certain size and the width allowed.

import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import java.awt.Component;
import javax.swing.*;
import java.io.*;
import java.lang.*;

public class mcve
{
    JFrame numberConversionWindow = new JFrame("Number Conversion");

    public void numberConvertGUI()
    {
        numberConversionWindow.setBounds(10, 10, 420, 300);
        numberConversionWindow.addComponentListener(new ComponentAdapter() 
        {
            @Override
            public void componentResized(ComponentEvent e) 
            {
                numberConversionWindow.setSize(new Dimension(numberConversionWindow.getWidth(), 300));
                super.componentResized(e);
                numberConversionWindow.repaint();
            }
        });
        numberConversionWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        numberConversionWindow.setLayout(new GridLayout(1,1));

        numberConversionWindow.setVisible(true);
    }

    public static void main(String[] args)
    {
        mcve mc = new mcve();
        mc.numberConvertGUI();
    }
}

However, there is a problem with this code. It is often buggy. When I start resizing to make it wider, there is a black line that flickers before resizing the frame.

The following glitches occur when recalibrating the height. It can simply leave a large black area instead of snapping back to 300, and sometimes it doesn’t lean back at all.

, , , , , , , ? , ?

Edit

numberConversionWindow.setMinimumSize(new Dimension(420, 300));
numberConversionWindow.setMaximumSize(new Dimension(numberConversionWindow.getWidth(), 300));

JFrame.

2

JFrame ). .

public class NumberConverter
{
...
static 
{
    if (System.getProperty("sun.arch.data.model").equals("32"))
    {   // 32-bit JVM
        System.loadLibrary("my32bitdll");
        System.out.println("Running 32-bit JVM");

    }

    else 
    {
        // 64-bit JVM
        System.loadLibrary("my64bitdll");
        System.out.println("Running 64-bit JVM");
    }
}
//public static native int getComponentHWND(numberConversionWindow);
//public static native int setMinMaxResizeBoundaries(getComponentHWND, 420, 300, numberConversionWindow.getWidth(), 300);

public void numberConvertGUI()
{
    numberConversionWindow.setBounds(10, 10, 420, 300);

    int hwndForJFrame = getComponentHWND(numberConversionWindow);
    numberConversionWindow.setMinMaxResizeBoundaries(hwndForJFrame, 420, 300, numberConversionWindow.getWidth(), 300);
...
}
    public static void main(String[] args)
    {
        NumberConverter nC = new NumberConverter();
        nC.numberConvertGUI();
    }
}

cannot find symbol - method setMinMaxResizeBoundaries(int,int,int,int,int) cannot find symbol - getComponentHWND(numberConversionWindow). , - , setMinMaxResizeBoundaries getComponentHWND, . , public static native int, numberConvertGUI()

JFrame =

static {
if (System.getProperty("sun.arch.data.model").equals("32"))
{   // 32-bit JVM
    System.loadLibrary("my32bitdll");
    System.out.println("Running 32-bit JVM");

} else {
    // 64-bit JVM
    System.loadLibrary("my64bitdll");
    System.out.println("Running 64-bit JVM");
}
}
// Sets a window to never be resized above or below these minimum widths/heights
public static native int setMinMaxResizeBoundaries(int hwnd, int minWidth, int minHeight, int maxWidth, int maxHeight);

// Returns the HWND for the specified component, or -1 if does not exist
public static native int getComponentHWND(Component c);

Answer 1

: . Swing Java-, ... . . , Java. Java, , . .

( ++) - . , , . , .