Netbeans 8.0.2简单二维绘图

使用Netbeans 8.0.2开始使用Java 2D时遇到问题。如果有人能发布一些非常基本的代码，仅仅是一个框架，里面有一个面板和一个简单的形状，我会非常感激

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我已经阅读了很多教程，覆盖了

paintcomponent（）

，

super.paintcomponent（）

等。但我真的不知道该方法是如何调用的，或者是什么调用的，因为在我的代码中没有调用它：(

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下面是在

框架内的
JPanel
上绘制椭圆形的简单代码

import javax.swing.*;
import java.awt.*;
public class Test extends JFrame
{
public Test ()
{
    setSize (300,300);
    JPanel panel=new JPanel (){
        @Override
        public void paint (Graphics g){
            g.setColor (Color.BLUE);
            g.fillOval(100, 100, 100, 100);
        }
    };
    add(panel);
    setVisible (true);
}


public static void main (String args[]){
    new Test();
 }
}

您应该发布不起作用的代码以显示您尝试的内容。“我的代码中没有调用它”，但您的代码在哪里？发布您的代码或解释您尝试的内容。@Noob999:您的项目中有两个
public static void main（String[]args）{
。将其中一个的内容放到另一个，然后删除此
main…
。
package guitest2;

public class TableFrame extends javax.swing.JFrame {
public TableFrame() {
    initComponents();
}


@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 529, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 393, Short.MAX_VALUE)
    );

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

/**
 * @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(TableFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(TableFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(TableFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(TableFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>


    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new TableFrame().setVisible(true);
        }
    });
 }               
}

package guitest2;
import javax.swing.JFrame;
public class GUITest2 {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
   TableFrame tf = new TableFrame();
   tf.setTitle("BJ");
   tf.setSize(1200,800);
   tf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   TablePanel p = new TablePanel();
   tf.setVisible(true);
   tf.add(p);

 }
}

import javax.swing.*;
import java.awt.*;
public class Test extends JFrame
{
public Test ()
{
    setSize (300,300);
    JPanel panel=new JPanel (){
        @Override
        public void paint (Graphics g){
            g.setColor (Color.BLUE);
            g.fillOval(100, 100, 100, 100);
        }
    };
    add(panel);
    setVisible (true);
}


public static void main (String args[]){
    new Test();
 }
}