从不同 class 到 GUI class 的条形图

Bar Chart from different class in to GUI class

我有带有 JPanel 和 JButton 的 Gui class。单击按钮后,我想在我的 JPanel 中显示图形。该图在不同 class 中。有人可以帮我做这个吗?

GUI CLASS:

 public class Gui  extends JFrame implements ActionListener{  

     JButton showGraph;

     public Gui() {

    super("GUI");
    setSize(1200,600);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    showGraph = new JButton("SHOW GRAPH");
    JPanel mainPanel = new JPanel();
    add(mainPanel);
    mainPanel.setLayout(new GridLayout(2,0,10,10));
    mainPanel.setBorder(new EmptyBorder(10,10,10,10));
    mainPanel.add(showGraph);
    JPanel graphPanel = new JPanel();
    graphPanel.setBackground(Color.yellow);
    mainPanel.add(graphPanel);

    showGraph.addActionListener(this);

  }



 public static void main (String[] args){
    new Gui().setVisible(true);
}

@Override
public void actionPerformed(ActionEvent e) {
    if (e.getSource() == showGraph) {
        SimpleBarChart b =  new SimpleBarChart();
        b.getGraph();
    }
}
}

更改您的 getGraph() 方法以获取 JFrame 并传入 this

public void getgraph(JFrame f) {

//JFrame f = new JFrame();
f.setSize(400, 300);
... as before ...
}

然后调用actionPerformed

if (e.getSource() == showGraph) {
    SimpleBarChart b =  new SimpleBarChart();
    b.getGraph(this);
}

框架中不能有框架。另一种选择是使 getGraph() return 成为 JPanel,然后您可以将面板放在现有框架中而不是更新整个框架。