java小程序显示为空
我已经研究这个问题好几个小时了,没有结果。在查看HTML页面或通过Eclipse运行小程序时,我似乎无法使小程序正确显示。它总是空白的。我已经找了很长一段时间了,我决定问问。 代码如下:java小程序显示为空,java,applet,Java,Applet,我已经研究这个问题好几个小时了,没有结果。在查看HTML页面或通过Eclipse运行小程序时,我似乎无法使小程序正确显示。它总是空白的。我已经找了很长一段时间了,我决定问问。 代码如下: import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.applet.*; public class Topics extends Applet{ String topicTotal = "";
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
public class Topics extends Applet{
String topicTotal = "";
JPanel topicPanel;
JLabel title, username, topic, paragraph, topicsTitle;
JTextField nameField, topicField;
JButton submitButton;
JTextArea paragraphArea;
public String getTopicTotal() {
return topicTotal;
}
public JPanel createContentPane(){
final JPanel topicGUI = new JPanel();
topicGUI.setLayout(null);
//posting panel
final JPanel postPanel = new JPanel();
postPanel.setLayout(null);
postPanel.setLocation(0, 0);
postPanel.setSize(500, 270);
topicGUI.add(postPanel);
setVisible(true);
// JLabels
JLabel title = new JLabel("Make A Post");
title.setLocation(170, 3);
title.setSize(150,25);
title.setFont(new Font("Serif", Font.PLAIN, 25));
title.setHorizontalAlignment(0);
postPanel.add(title);
JLabel username = new JLabel("Username: ");
username.setLocation(20, 30);
username.setSize(70,15);
username.setHorizontalAlignment(0);
postPanel.add(username);
JLabel topic = new JLabel("Topic: ");
topic.setLocation(20, 50);
topic.setSize(40,15);
topic.setHorizontalAlignment(0);
postPanel.add(topic);
JLabel paragraph = new JLabel("Paragraph: ");
paragraph.setLocation(20, 70);
paragraph.setSize(70,15);
paragraph.setHorizontalAlignment(0);
postPanel.add(paragraph);
// JTextFields
nameField = new JTextField(8);
nameField.setLocation(90, 30);
nameField.setSize(150, 18);
postPanel.add(nameField);
topicField = new JTextField(8);
topicField.setLocation(60, 50);
topicField.setSize(180, 18);
postPanel.add(topicField);
// JTextAreas
paragraphArea = new JTextArea(8, 5);
paragraphArea.setLocation(20, 85);
paragraphArea.setSize(450, 100);
paragraphArea.setLineWrap(true);
paragraphArea.setEditable(true);
JScrollPane scrollParagraph = new JScrollPane (paragraphArea);
scrollParagraph.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
postPanel.add(paragraphArea);
// JButton
JButton submitButton = new JButton("SUBMIT");
submitButton.setLocation(250, 30);
submitButton.setSize(100, 30);
submitButton.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
topicTotal = topicTotal + "/n" + nameField + "/n" + topicTotal + "/n" + paragraphArea + "/n";
}
});
postPanel.add(submitButton);
setVisible(true);
return topicGUI;
}
private static void createAndShowGUI() {
JFrame frame = new JFrame("");
Topics display = new Topics();
frame.setContentPane(display.createContentPane());
frame.setSize(500, 270);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
要作为小程序运行,需要重写
init
方法。您不需要main
方法。只需将所有组件添加到init
方法中即可
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
public class Topics extends Applet {
String topicTotal = "";
JPanel topicPanel;
JLabel title, username, topic, paragraph, topicsTitle;
JTextField nameField, topicField;
JButton submitButton;
JTextArea paragraphArea;
public String getTopicTotal() {
return topicTotal;
}
public void init() {
final JPanel topicGUI = new JPanel();
topicGUI.setLayout(null);
// posting panel
final JPanel postPanel = new JPanel();
postPanel.setLayout(null);
postPanel.setLocation(0, 0);
postPanel.setSize(500, 270);
add(postPanel);
setVisible(true);
// JLabels
JLabel title = new JLabel("Make A Post");
title.setLocation(170, 3);
title.setSize(150, 25);
title.setFont(new Font("Serif", Font.PLAIN, 25));
title.setHorizontalAlignment(0);
add(title);
JLabel username = new JLabel("Username: ");
username.setLocation(20, 30);
username.setSize(70, 15);
username.setHorizontalAlignment(0);
add(username);
JLabel topic = new JLabel("Topic: ");
topic.setLocation(20, 50);
topic.setSize(40, 15);
topic.setHorizontalAlignment(0);
add(topic);
JLabel paragraph = new JLabel("Paragraph: ");
paragraph.setLocation(20, 70);
paragraph.setSize(70, 15);
paragraph.setHorizontalAlignment(0);
add(paragraph);
// JTextFields
nameField = new JTextField(8);
nameField.setLocation(90, 30);
nameField.setSize(150, 18);
add(nameField);
topicField = new JTextField(8);
topicField.setLocation(60, 50);
topicField.setSize(180, 18);
add(topicField);
// JTextAreas
paragraphArea = new JTextArea(8, 5);
paragraphArea.setLocation(20, 85);
paragraphArea.setSize(450, 100);
paragraphArea.setLineWrap(true);
paragraphArea.setEditable(true);
JScrollPane scrollParagraph = new JScrollPane(paragraphArea);
scrollParagraph
.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
add(paragraphArea);
// JButton
JButton submitButton = new JButton("SUBMIT");
submitButton.setLocation(250, 30);
submitButton.setSize(100, 30);
submitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
topicTotal = topicTotal + "/n" + nameField + "/n" + topicTotal
+ "/n" + paragraphArea + "/n";
}
});
add(submitButton);
}
}
它对我在NetBeans上运行非常好,作为应用程序还是小程序运行?因为我的应用程序运行良好,但作为小程序运行时是空白的。您如何将小程序附加到HTML以及浏览器上是否启用了Java?Java已完全启用,下面是我附加它的方式:为了作为小程序运行,您需要覆盖
init()
方法。我在下面贴了一个答案。我没有得到一个正确格式化它的方法,但它可以运行。您不需要将main
作为小程序运行。按你想要的方式格式化就行了。但您可以将程序作为小程序运行。