Question

我在一个jFrame中有2个jPanel，在第一个jPanel（Steiner）我绘制图形，在第二个B上，我有按钮，我在框架上添加到jPanel，按钮的所有动作都在Frame类中，I无法使用Steiner的公共方法。我怎么用呢？

    package net.kxyz;

   import java.awt.Color;
   import java.awt.Dimension;
   import java.awt.Graphics;
   import java.awt.Graphics2D;
   import java.util.Random;

   /**
    *
    * @author kuman
    */
   public class Steiner extends javax.swing.JPanel {

int minX = 1000, minY = 1000, maxX = 0, maxY = 0;
long temp = 1000;
Graph graph = new Graph(6);
Point[] p = new Point[6];
int hight = 7; // hieight of oval - Point
int width = 7; //  width of oval - Point
int terminals;
Random rand = new Random();
LazyPrimMinimumSpanningTree lazyPrimMST = new LazyPrimMinimumSpanningTree(graph);

/**
 * Creates new form Steiner
 */
public Steiner() {

    graph = setTerminals();
    lazyPrimMST.Find(graph);
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 317, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 279, Short.MAX_VALUE)
    );
}// </editor-fold>

// Variables declaration - do not modify
// End of variables declaration
@Override
public void paint(Graphics x) {
    super.paint(x);

    Dimension d = getSize();


    Graphics2D g = (Graphics2D) x;

    for (int i = 0; i < 100; i++) {
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, d.width, d.height);
        findSolution();





        for (Edge edge : lazyPrimMST.edges()) {
            // g.setColor(Color.black);

            g.setColor(edge.getPointP().getColor());
            g.fillOval(edge.getPointP().getX(), edge.getPointP().getY(), width, hight);
            g.setColor(edge.getPointN().getColor());
            g.fillOval(edge.getPointN().getX(), edge.getPointN().getY(), width, hight);
            g.drawLine(edge.getPointP().getX(), edge.getPointP().getY() + 4, edge.getPointN().getX(), edge.getPointN().getY() + 4);

        }




    }
}

public void findMinMax(Point p, Point n) {
    //code

}

public void findSolution() {
      //code

    }
}

框

    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package net.kxyz;

    /**
             *
     * @author kuman
     */
    public class Ramka extends javax.swing.JFrame {

/**
 * Creates new form Ramka
 */
public Ramka() {
    Steiner steiner;
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    steiner1 = new net.kxyz.Steiner();
    b1 = new net.kxyz.B();
    bRandom = new javax.swing.JButton();
    bStart = new javax.swing.JButton();
    valueOfTerminals = new javax.swing.JSpinner();
    jLabel1 = new javax.swing.JLabel();
    valueOfGeneration = new javax.swing.JSpinner();
    valueOfLimfocits = new javax.swing.JSpinner();
    jLabel2 = new javax.swing.JLabel();
    jLabel3 = new javax.swing.JLabel();
    jScrollPane2 = new javax.swing.JScrollPane();
    textPanel = new javax.swing.JTextPane();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    javax.swing.GroupLayout steiner1Layout = new javax.swing.GroupLayout(steiner1);
    steiner1.setLayout(steiner1Layout);
    steiner1Layout.setHorizontalGroup(
        steiner1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 0, Short.MAX_VALUE)
    );
    steiner1Layout.setVerticalGroup(
        steiner1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 251, Short.MAX_VALUE)
    );

    bRandom.setText("Losuj");
    bRandom.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            bRandomActionPerformed(evt);
        }
    });

    bStart.setText("Start");
    bStart.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            bStartActionPerformed(evt);
        }
    });

    valueOfTerminals.addPropertyChangeListener(new java.beans.PropertyChangeListener() {
        public void propertyChange(java.beans.PropertyChangeEvent evt) {
            valueOfTerminalsPropertyChange(evt);
        }
    });

    jLabel1.setText("Liczba terminali:");

    jLabel2.setText("Liczba generacji:");

    jLabel3.setText("Liczba limfocytów:");

    jScrollPane2.setViewportView(textPanel);

    javax.swing.GroupLayout b1Layout = new javax.swing.GroupLayout(b1);
    b1.setLayout(b1Layout);
    b1Layout.setHorizontalGroup(
        b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(b1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel1)
                .addComponent(jLabel2)
                .addComponent(jLabel3))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addGroup(b1Layout.createSequentialGroup()
                    .addComponent(valueOfLimfocits, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(bStart, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGroup(b1Layout.createSequentialGroup()
                    .addComponent(valueOfTerminals, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(bRandom, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addComponent(valueOfGeneration, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addComponent(jScrollPane2, javax.swing.GroupLayout.DEFAULT_SIZE, 165, Short.MAX_VALUE)
            .addGap(11, 11, 11))
    );
    b1Layout.setVerticalGroup(
        b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(b1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jScrollPane2)
                .addGroup(b1Layout.createSequentialGroup()
                    .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(bRandom)
                        .addComponent(valueOfTerminals, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jLabel1))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(valueOfGeneration, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jLabel2))
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(b1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(valueOfLimfocits, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jLabel3)
                        .addComponent(bStart)))))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(steiner1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addComponent(b1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addComponent(steiner1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(b1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
    );

    pack();
}// </editor-fold>

private void bStartActionPerformed(java.awt.event.ActionEvent evt) {
    findSolution(); //doesnt work (?)
}

private void valueOfTerminalsPropertyChange(java.beans.PropertyChangeEvent evt) {
    // TODO add your handling code here:



}

private void bRandomActionPerformed(java.awt.event.ActionEvent evt) {
    findSolution();

}

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /*
     * Set the Nimbus look and feel
     */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /*
     * If Nimbus (introduced in Java SE 6) is not available, stay with the
     * default look and feel. For details see
     * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Ramka.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Ramka.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Ramka.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Ramka.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /*
     * Create and display the form
     */
    java.awt.EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            new Ramka().setVisible(true);
        }
    });
}
// Variables declaration - do not modify
private net.kxyz.B b1;
private javax.swing.JButton bRandom;
private javax.swing.JButton bStart;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JScrollPane jScrollPane2;
private net.kxyz.Steiner steiner1;
private javax.swing.JTextPane textPanel;
private javax.swing.JSpinner valueOfGeneration;
private javax.swing.JSpinner valueOfLimfocits;
private javax.swing.JSpinner valueOfTerminals;
// End of variables declaration
    }

乙

    package net.kxyz;


    public class B extends javax.swing.JPanel {

/**
 * Creates new form B
 */
public B() {
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

    jButton1 = new javax.swing.JButton();

    jButton1.setText("jButton1");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
    this.setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(22, 22, 22)
            .addComponent(jButton1)
            .addContainerGap(305, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(30, 30, 30)
            .addComponent(jButton1)
            .addContainerGap(247, Short.MAX_VALUE))
    );
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    findSoluton();   // doesnt work too (?)     // TODO add your handling code here:
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
    }

Answer 1

您可以将Steiner实例传递给B实例，然后允许B在Steiner上调用公共方法。

如，

B.java（顺便说一下可怕的班级名称）：

public class B {
  private Steiner steiner;

  public B(Steiner steiner) {
    this.steiner = steiner;
  }

Frame.java：

steiner1 = new net.kxyz.Steiner();
b1 = new net.kxyz.B(steiner1);  // ***** note the change

有关您的代码的其他评论：

覆盖JPanel的paintComponent方法，而不是其paint方法。
您不应该在任何绘制方法中使用findSolution（）方法或任何逻辑方法，paint或paintComponent，因为这些方法仅用于绘制。
我将B类重命名为其他名称，也许是“ButtonPanel”。
我将Frame类重命名为其他类，因为Frame已经是标准Java库中的类名，而您的名字可能会让其他人感到困惑。尝试给它一个更具体的名称。
最终，您需要将程序的逻辑部分与MVC或其众多变体之一的GUI部分完全分开。
我会让你的一个按钮调用findSolution（）并让这个方法进行你的计算，但不要参与绘制任何东西（并且不再是你的paint或paintComponent方法的一部分）。然后当完成findSolution（）时，调用repaint以便可以在paintComponent方法中显示数据。
请注意，如果findSolution需要很长时间才能完成（超过100-200毫秒），您将需要在后台线程中运行它，例如在SwingWorker中。
很快你就会了解内聚和耦合，你会避免像我发布的那样使用直接解决方案。相反，您将使用接口来放松程序的耦合并增加其内聚力。但就目前而言，您可能只想了解这些概念以及依赖注入，以便熟悉它们的内容。

按钮，jFrame，jPanel，我没有访问方法

1 个答案: