[Java] Ridimensionamento del frame: toolbar e contentpane non si aggiornano

[simo7784]

Non lo fa in automatico? Prova questo.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToolBar;

public class NewClass extends JFrame{
    JFrame f;
    
    public NewClass() {
        Container content = this.getContentPane();
        
        //Faccio una toolbar
        JToolBar toolBar = new JToolBar("");
        toolBar.add(new JButton("a"));
        toolBar.add(new JButton("b"));
        content.add(toolBar, BorderLayout.NORTH);
        
        //Faccio un pannello con bottone per l'evento ridimensionamento
        JPanel pane = new JPanel();
        pane.setBackground(Color.RED);
        JButton b = new JButton("Resize!");
        f = this;
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                f.setSize(1000, 1000);
            }
            
        });
        pane.add(b);
        content.add(pane,BorderLayout.CENTER);
        
        //Visualizzo la finestra
        this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        this.setSize(100, 100);
        this.setVisible(true);
    }
    
    public static void main(String[] args) {
        new NewClass();
    } 
}