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Quellcode

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CircleRect extends JFrame{
    public static void main(String[] args){
        CircleRect ksat = new CircleRect();
    }
    
    public CircleRect(){
        CirclePanel cp = new CirclePanel();
        Clistener cl = new Clistener(cp);
        JPanel pBot = new JPanel();
        
        this.setLayout(new GridLayout(2,1));
        
        cp.add(new JLabel("Hier stand irgendein Zeug"));
        
        JButton btnC = new JButton("Circle");
        btnC.setActionCommand("c");
        btnC.addActionListener(cl);
        pBot.add(btnC);
        JButton btnR = new JButton("Rechteck");
        btnR.setActionCommand("r");
        btnR.addActionListener(cl);
        pBot.add(btnR);
        
        add(cp);
        add(pBot);
        
        setVisible(true);
        setSize(400,250);
    }
}

class CirclePanel extends  JPanel{
    public boolean circle;
    public void paintComponent(Graphics g){
        g.setColor(Color.black);
        if(circle == true){
            g.drawOval(150,50,50,50);
        }
        else{
            g.drawRect(150,50,50,50);
        }
    }
}

class Clistener implements ActionListener{
    CirclePanel cP;
    Clistener(CirclePanel c){
        cP = c;
    }
    
    public void actionPerformed(ActionEvent e){
        if(e.getActionCommand().equals("c"))
            cP.circle = true;
        if(e.getActionCommand().equals("r"))
            cP.circle = false;
        cP.repaint();
    }
}