boxlayoutframe.java

来自「java2参考大全上的例子的源码和自己的理解.」· Java 代码 · 共 50 行

package boxlayoutframe;
//BoxLayoutFrame.java
import java.awt.*;
import javax.swing.*;

public class BoxLayoutFrame extends JFrame {
  BoxLayoutTest panel = new BoxLayoutTest();

  public BoxLayoutFrame() {
    //Returns the contentPane object for this frame.
    this.getContentPane().add(panel);
    this.setSize(500,220);
    //设置程序的标题
    this.setTitle("BoxLayoutDemo");
    //Sets the operation that will happen by default when the user initiates a "close" on this frame.
    //You must specify one of the following choices
    //EXIT_ON_CLOSE (defined in JFrame): Exit the application using the System exit method. Use this only in applications.
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //Makes the Window visible. If the Window and/or its owner are not yet displayable, both are made displayable. The Window will be validated prior to being made visible.
    //If the Window is already visible, this will bring the Window to the front.
    this.show();
  }

  public static void main(String[] args) {
    BoxLayoutFrame frame = new BoxLayoutFrame();
  }
}

class BoxLayoutTest extends JPanel {
  BoxLayoutTest() {
    // Set the layout to a y-axis BoxLayout
    //Y_AXIS - Components are laid out vertically from top to bottom.
    setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

    // Create three components
    TextField textField = new TextField();//textField相当于edit控件
    TextArea textArea = new TextArea(4, 20);//textArea类似于ListView
    JButton button = new JButton(
      "Click me!");

    // Add the three components to the BoxLayout
    add(new JLabel("TextField"));
    add(textField);
    add(new JLabel("TextArea"));
    add(textArea);
    add(new JLabel("Button"));
    add(button);
  }
}