Java用户界面之标签和文本框

JLable组件显示用户不能修改的信息，JTextField组件是用户可以输入单行文本的区域

创建一个JLable组件和一个JTextField对象，并将它们加入到容器中:

　　JLabel pageLabel = new JLabel("Web page address: " , JLabel.RIGHT);
      JTextField pageAddress = new JTextField(20);
      FlowLayout flo = new FlowLayout();
      setLayout(flo);
      add(pageLabel);
      add(pageAddress);

JLabel.RIGHT:将文本与标签右对齐

JLabel.LEFT:将文本与标签左对齐

JLabel.CENTER:居中显文本

Demo：

 1 package com.swingdemo.demo;
 2
 3 import java.awt.FlowLayout;
 4
 5 import javax.swing.JFrame;
 6 import javax.swing.JLabel;
 7 import javax.swing.JTextField;
 8 import javax.swing.UIManager;
 9
10 public class WebAddress extends JFrame {
11
12     private static final long serialVersionUID = 1L;
13
14     public WebAddress() {
15
16         super("Label and Text boxes");
17         setLookAndFeel();
18         setSize(400, 100);
19         JLabel pageLabel = new JLabel("Web page address: " , JLabel.RIGHT);
20         JTextField pageAddress = new JTextField(20);
21         //设置对象的文本
22         pageAddress.setText("http://java.sun.com");
23         //JTextField pageAddress = new JTextField("http://java.sun.com", 20);//创建对象并赋默认值
24         FlowLayout flo = new FlowLayout();
25         setLayout(flo);
26         add(pageLabel);
27         add(pageAddress);
28         setVisible(true);
29
30         //获取对象包含的文本
31         String countryChoice = pageAddress.getText();
32         System.out.println(countryChoice);
33
34     }
35
36     private void setLookAndFeel() {
37
38         try {
39             UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
40         } catch (Exception e) {
41             e.printStackTrace();
42         }
43
44     }
45
46     public static void main(String[] args) {
47
48         WebAddress wa = new WebAddress();
49
50     }
51
52 }