小程序背景闪烁？

Question

我制作了一个简单的测试applet,它有一个红色背景和几个按钮.当我运行applet(它在http://nuevawave.org/sandbox/JavaGallery/GUIApplet.html)时,按钮显示,但红色不显示.当我点击小程序时,有时背景的一部分会闪烁红色.有谁知道可能是什么问题？

这是applet代码:

package test;

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

public class GUIApplet extends javax.swing.JApplet {

/** Initializes the applet GUIApplet */
public void init() {
    try {
        java.awt.EventQueue.invokeAndWait(new Runnable() {
            public void run() {
                initComponents();
            }
        });
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

public void paint(Graphics g) {
    super.paint(g);
}

/** This method is called from within the init() method 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() {

    jTextField1 = new javax.swing.JTextField();
    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();

    setBackground(new java.awt.Color(255, 0, 0));
    setMaximumSize(new java.awt.Dimension(250, 300));
    setPreferredSize(new java.awt.Dimension(250, 300));
    setSize(new java.awt.Dimension(250, 300));
    getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

    jTextField1.setText("jTextField1");
    getContentPane().add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(70, 170, -1, -1));

    jButton1.setText("jButton1");
    getContentPane().add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(17, 90, -1, -1));

    jButton2.setText("jButton2");
    getContentPane().add(jButton2, new org.netbeans.lib.awtextra.AbsoluteConstraints(120, 90, -1, -1));
}// </editor-fold>


// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JTextField jTextField1;
// End of variables declaration

}

Answer 1

您需要设置JApplet的contentPane的背景,而不是JApplet本身,因为它是实际保存组件并正在显示的contentPane.调用getContentPane().setBackground(...);init方法而不是裸setBackground(...)调用.