Swing JPanels werden nicht angezeigt!

[Lucaaa]

Hallo!
Meine JPanels werden nicht angezeigt!
Sieht wer, wo das Problem liegt?

Main.java

package com.ludevstudio.zipbombbuilder;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JFrame;
public class Main {
 
 
 public static void main(String[] args) {
  MainFrame frame = new MainFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setResizable(false);
  frame.setTitle("ZipbombBuilder V1.0");
  frame.setSize(400, 600);
  frame.setLocationRelativeTo(null);
  //frame.setVisible(true);
 }
 
}

MainFrame.java

package com.ludevstudio.zipbombbuilder;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JSpinner;
import javax.swing.JTextField;
import javax.swing.SpinnerNumberModel;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
import javax.swing.plaf.LabelUI;
public class MainFrame extends JFrame {
 private JPanel panInputFile, panArchive;
 
 // Components for Panel: Input File
 private JLabel labFileSize, labFileName;
 private JSpinner spinnInputFileSize;
 private JRadioButton radioMB, radioGB;
 private JButton labHelpFileSize, labHelpFileName;
 private JTextField tfInputFIleName;
 
 // Components for Panel: Archive
 private JLabel labArchiveLayers, labArchiveFilesperLayer;
 private JSpinner spinnerArchiveLayers, spinnerArchiveFilesperLayer;
 private JButton btnHelpLayers, btnHelpElementsperLayer;
 
 public MainFrame() {
  this.setLayout(new GridBagLayout());
  initComponents();
 }
 
 
 public void initComponents() {
  
  GridBagConstraints gbc = new GridBagConstraints();
  gbc.gridx = 0;
  gbc.gridy = 0;
  
  Font compFont = new Font("Arial", Font.LAYOUT_LEFT_TO_RIGHT, 16);
  
  // Panel for Input File Settings
  panInputFile = new JPanel();
  panInputFile.setBounds(0,0,this.getContentPane().getWidth(), 50);
  panInputFile.setBorder(new TitledBorder("Input File:"));
  panInputFile.setLayout(null);
  this.add(panInputFile, gbc);
  
  
  labFileSize = new JLabel("File Size:");
  labFileSize.setBounds(20, 45, 100, 30);
  labFileSize.setFont(compFont);
  panInputFile.add(labFileSize);
  
  SpinnerNumberModel spinnerModelInputFileSize = new SpinnerNumberModel(4096, 0, 1000000, 1);
  
  spinnInputFileSize = new JSpinner(spinnerModelInputFileSize);
  spinnInputFileSize.setBounds(100, 50, 80, 25);
  spinnInputFileSize.setFont(compFont);
  panInputFile.add(spinnInputFileSize);
  
  
  
  radioMB = new JRadioButton("MB");
  radioMB.setBounds(230, 45, 50, 30);
  radioMB.setFont(compFont);
  radioMB.setSelected(true);
  panInputFile.add(radioMB);
  
  
  radioGB = new JRadioButton("GB");
  radioGB.setBounds(290, 45, 50, 30);
  radioGB.setFont(compFont);
  panInputFile.add(radioGB);
  
  ButtonGroup btngroupInputFileSize = new ButtonGroup();
  btngroupInputFileSize.add(radioGB);
  btngroupInputFileSize.add(radioMB);
  
  
  labHelpFileSize = new JButton("?");
  labHelpFileSize.setFont(compFont);
  labHelpFileSize.setBorder(new LineBorder(Color.black));
  labHelpFileSize.setBounds(360, 45, 25, 25);
  labHelpFileSize.setAlignmentX(CENTER_ALIGNMENT);
  panInputFile.add(labHelpFileSize);
  
  labFileName = new JLabel("File Name:");
  labFileName.setFont(compFont);
  labFileName.setBounds(20, 15, 100, 30);
  panInputFile.add(labFileName);
  
  tfInputFIleName = new JTextField();
  tfInputFIleName.setBounds(100, 20, 240, 25);
  panInputFile.add(tfInputFIleName);
  
  labHelpFileName = new JButton("?");
  labHelpFileName.setFont(compFont);
  labHelpFileName.setBorder(new LineBorder(Color.black));
  labHelpFileName.setBounds(360, 15, 25, 25);
  labHelpFileName.setAlignmentX(CENTER_ALIGNMENT);
  panInputFile.add(labHelpFileName);
  
  
  
  // Panel for Archive Settings
  gbc.gridx = 0;
  gbc.gridy = 1;
  panArchive = new JPanel();
  panArchive.setBounds(0,200,this.getContentPane().getWidth(), 70);
  panArchive.setBorder(new TitledBorder("Archive:"));
  panArchive.setLayout(null);
  this.add(panArchive, gbc);
  
  labArchiveLayers = new JLabel("File Layers:");
  labArchiveLayers.setBounds(20, 15, 100, 30);
  labArchiveLayers.setFont(compFont);
  panArchive.add(labArchiveLayers);
  
  labArchiveFilesperLayer = new JLabel("Elements per Layer:");
  labArchiveFilesperLayer.setBounds(20, 45, 150, 30);
  labArchiveFilesperLayer.setFont(compFont);
  panArchive.add(labArchiveFilesperLayer);
  
  btnHelpLayers = new JButton("?");
  btnHelpLayers.setFont(compFont);
  btnHelpLayers.setBorder(new LineBorder(Color.black));
  btnHelpLayers.setBounds(360, 15, 25, 25);
  btnHelpLayers.setAlignmentX(CENTER_ALIGNMENT);
  panArchive.add(btnHelpLayers);
  
  btnHelpElementsperLayer = new JButton("?");
  btnHelpElementsperLayer.setFont(compFont);
  btnHelpElementsperLayer.setBorder(new LineBorder(Color.black));
  btnHelpElementsperLayer.setBounds(360, 45, 25, 25);
  btnHelpElementsperLayer.setAlignmentX(CENTER_ALIGNMENT);
  panArchive.add(btnHelpElementsperLayer);
  
  SpinnerNumberModel spinnerModelArchiveLayers = new SpinnerNumberModel(8, 1, 64, 1);
  spinnerArchiveLayers = new JSpinner(spinnerModelArchiveLayers);
  spinnerArchiveLayers.setBounds(280, 15, 60, 25);
  spinnerArchiveLayers.setFont(compFont);
  panArchive.add(spinnerArchiveLayers);
  
  spinnerArchiveFilesperLayer = new JSpinner(spinnerModelArchiveLayers);
  spinnerArchiveFilesperLayer.setBounds(280, 45, 60, 25);
  spinnerArchiveFilesperLayer.setFont(compFont);
  panArchive.add(spinnerArchiveFilesperLayer);
 
 setVisible(true);
 
 }
 
 
}

 

[mihe7]

An dem Code wirst Du einiges ändern müssen. Schau Dir mal https://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html an.

 

[Lucaaa]

An dem Code wirst Du einiges ändern müssen

Ich habe es genau so gemacht, wie es da steht und es funktioniert nicht

 

[mihe7]

So, so. Wo hast Du denn z. B. weightx eingestellt? Wo steht dort beispielsweise etwas davon, dass Du setBounds aufrufen sollst?

Ein LayoutManager ist dafür da, Größe und Position von Komponenten eines Containers festzulegen. Du wendest GridBagLayout falsch an (weightx, etc.), hantierst mit einem null-Layout rum, setzt irgendwelche Bounds, rufst Größen ab, die noch gar nicht existieren können. Das funktioniert so nun einmal nicht.

Wie soll der Spaß denn am Ende aussehen?

 

[Lucaaa]

Wie soll der Spaß denn am Ende aussehen?

Die Panels sollen genau untereinander sein. Allerdings funktioniert es auch nicht wenn ich den LayoutManager null setze. Es wird auch nichts angezeigt. Genau so wie bei jedem anderen LayoutManager mit ausnahme des GridLayouts.

 

[mihe7]

Es wird auch nichts angezeigt

Wie auch? Deine Panels mit null-Layout haben eine bevorzugte Größe von 0,0. Der LayoutManager setzt die Größe dem entsprechend auf 0,0.

Hier mal etwas, das mal wenigstens etwas anzeigt:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JSpinner;
import javax.swing.JTextField;
import javax.swing.SpinnerNumberModel;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
import javax.swing.plaf.LabelUI;
public class MainFrame extends JFrame {
 private JPanel panInputFile, panArchive;

 // Components for Panel: Input File
 private JLabel labFileSize, labFileName;
 private JSpinner spinnInputFileSize;
 private JRadioButton radioMB, radioGB;
 private JButton labHelpFileSize, labHelpFileName;
 private JTextField tfInputFIleName;

 // Components for Panel: Archive
 private JLabel labArchiveLayers, labArchiveFilesperLayer;
 private JSpinner spinnerArchiveLayers, spinnerArchiveFilesperLayer;
 private JButton btnHelpLayers, btnHelpElementsperLayer;

 public MainFrame() {
//  this.setLayout(new GridBagLayout());
  this.setLayout(new BoxLayout(this.getContentPane(), BoxLayout.PAGE_AXIS));
  initComponents();
 }


 public void initComponents() {
  Font compFont = new Font("Arial", Font.LAYOUT_LEFT_TO_RIGHT, 16);
  // Panel for Input File Settings
  panInputFile = new JPanel();
  panInputFile.setBorder(new TitledBorder("Input File:"));
  panInputFile.setLayout(null);
  panInputFile.setPreferredSize(new Dimension(400, 90));
  this.add(panInputFile);
 
  labFileSize = new JLabel("File Size:");
  labFileSize.setBounds(20, 45, 100, 30);
  labFileSize.setFont(compFont);
  panInputFile.add(labFileSize);
 
  SpinnerNumberModel spinnerModelInputFileSize = new SpinnerNumberModel(4096, 0, 1000000, 1);
 
  spinnInputFileSize = new JSpinner(spinnerModelInputFileSize);
  spinnInputFileSize.setBounds(100, 50, 80, 25);
  spinnInputFileSize.setFont(compFont);
  panInputFile.add(spinnInputFileSize);
 
  radioMB = new JRadioButton("MB");
  radioMB.setBounds(230, 45, 50, 30);
  radioMB.setFont(compFont);
  radioMB.setSelected(true);
  panInputFile.add(radioMB);
 
 
  radioGB = new JRadioButton("GB");
  radioGB.setBounds(290, 45, 50, 30);
  radioGB.setFont(compFont);
  panInputFile.add(radioGB);
 
  ButtonGroup btngroupInputFileSize = new ButtonGroup();
  btngroupInputFileSize.add(radioGB);
  btngroupInputFileSize.add(radioMB);
 
 
  labHelpFileSize = new JButton("?");
  labHelpFileSize.setFont(compFont);
  labHelpFileSize.setBorder(new LineBorder(Color.black));
  labHelpFileSize.setBounds(360, 45, 25, 25);
  labHelpFileSize.setAlignmentX(CENTER_ALIGNMENT);
  panInputFile.add(labHelpFileSize);
 
  labFileName = new JLabel("File Name:");
  labFileName.setFont(compFont);
  labFileName.setBounds(20, 15, 100, 30);
  panInputFile.add(labFileName);
 
  tfInputFIleName = new JTextField();
  tfInputFIleName.setBounds(100, 20, 240, 25);
  panInputFile.add(tfInputFIleName);
 
  labHelpFileName = new JButton("?");
  labHelpFileName.setFont(compFont);
  labHelpFileName.setBorder(new LineBorder(Color.black));
  labHelpFileName.setBounds(360, 15, 25, 25);
  labHelpFileName.setAlignmentX(CENTER_ALIGNMENT);
  panInputFile.add(labHelpFileName);
 
  // Panel for Archive Settings
  panArchive = new JPanel();
  panArchive.setBorder(new TitledBorder("Archive:"));
  panArchive.setPreferredSize(new Dimension(400, 90));
  panArchive.setLayout(null);
  this.add(panArchive);
 
  labArchiveLayers = new JLabel("File Layers:");
  labArchiveLayers.setBounds(20, 15, 100, 30);
  labArchiveLayers.setFont(compFont);
  panArchive.add(labArchiveLayers);
 
  labArchiveFilesperLayer = new JLabel("Elements per Layer:");
  labArchiveFilesperLayer.setBounds(20, 45, 150, 30);
  labArchiveFilesperLayer.setFont(compFont);
  panArchive.add(labArchiveFilesperLayer);
 
  btnHelpLayers = new JButton("?");
  btnHelpLayers.setFont(compFont);
  btnHelpLayers.setBorder(new LineBorder(Color.black));
  btnHelpLayers.setBounds(360, 15, 25, 25);
  btnHelpLayers.setAlignmentX(CENTER_ALIGNMENT);
  panArchive.add(btnHelpLayers);
 
  btnHelpElementsperLayer = new JButton("?");
  btnHelpElementsperLayer.setFont(compFont);
  btnHelpElementsperLayer.setBorder(new LineBorder(Color.black));
  btnHelpElementsperLayer.setBounds(360, 45, 25, 25);
  btnHelpElementsperLayer.setAlignmentX(CENTER_ALIGNMENT);
  panArchive.add(btnHelpElementsperLayer);
 
  SpinnerNumberModel spinnerModelArchiveLayers = new SpinnerNumberModel(8, 1, 64, 1);
  spinnerArchiveLayers = new JSpinner(spinnerModelArchiveLayers);
  spinnerArchiveLayers.setBounds(280, 15, 60, 25);
  spinnerArchiveLayers.setFont(compFont);
  panArchive.add(spinnerArchiveLayers);
 
  spinnerArchiveFilesperLayer = new JSpinner(spinnerModelArchiveLayers);
  spinnerArchiveFilesperLayer.setBounds(280, 45, 60, 25);
  spinnerArchiveFilesperLayer.setFont(compFont);
  panArchive.add(spinnerArchiveFilesperLayer);

}

    public static void main(String[] args) {
          MainFrame frame = new MainFrame();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setResizable(false);
  frame.setTitle("ZipbombBuilder V1.0");
//  frame.setSize(400, 600);
  frame.pack();
  frame.setLocationRelativeTo(null);
  frame.setVisible(true);
    }
}

 

[Lucaaa]

LayoutManager setzt die Größe dem entsprechend auf 0,0.

Ich setzte doch aber die Größe des Panels in der setBounds Methode

 

[mihe7]

Ich wiederhole mich: "Ein LayoutManager ist dafür da, Größe und Position von Komponenten eines Containers festzulegen."

Der LayoutManager ruft setBounds für die Komponenten des betreffenden Containers auf, das ist seine Aufgabe. Genau dafür ist das Teil da. Ob Du da vorher setBounds aufrufst oder nicht, interessiert nicht.

Noch eine Regel: verwende immer einen LayoutManger (d. h. nie null-Layout).