3-3 用label展示图片

public ImageIconDemo() {
  //显示ImageIcon在label上
  JLabel jlabel = new JLabel("ImageIcon");
  URL url = getSource("D://JavaTest//test.png");
  ImageIcon imageIcon = new ImageIcon(url);
  label.setIcon(imageIcon);
  label.setAlignment(SwingConstants.CENTER);
  this.setVisible(true);
  
  Container container = this.getContentPane();
  container.add(label);
}

3-4 文本域，JSCroll面板

public JScrollDemo {
  Container container = this.getContentPane();
  
  //文本域
  JTextArea textArea = new JTextArea(20,30); //设定x大小为20，y大小为30
  textArea.setText("Arthur");

  //scroll面板
  JScrollPane scrollPane = new JScrollPane(textArea);
  container.add(scrollPane);
}

3-5 单选框&多选框
单选框:

JRadioButton radioButton1 = new JRadioButton();
JRadioButton radioButton2 = new JRadioButton();
//存放单选button
ButtonGroup buttongroup = new ButtonGroup();
bg.add(radioButton1);
bg.add(radioButton2);

多选框

JCheckBox checkBox01 = new JCheckBox("CheckBox01");
JCheckBox checkBox02 = new JCheckBox("CheckBox02");

3-6 下拉框、列表框
下拉框

JComboBox status = new JComboBox();
status.addItem(null);
status.addItem("已下架");
status.addItem("正在上映");

列表框

//生成列表的内容
String[] contents = {"1", "2", "3"};
//列表中需要放入内容
JList jlist = new JList(contents);

3-7 文本框、密码框、文本域
文本框

JTextField textfield1 = new JTextField("hello");
JTextField textfield2 = new JTextField("world", 30); //30为最多输入字符的长度

密码框

JPasswordField passwordfield = new JPasswordField();
passwordfield.setEchoChar('a');

文本域

JTextArea textArea = new JTextArea(20,50);//设置row为20，col为50