Java AWT | BoxLayout 类
BoxLayout 类用于垂直(沿 Y 轴)或水平(沿 X 轴)排列组件。在 BoxLayout 类中，组件被放在单行或单列中。组件不会换行，因此，例如，当调整框架大小时，组件的水平排列将保持水平排列。
该类的构造函数:
- BoxLayout(容器 c，int 轴):创建一个用 X 轴或 Y 轴排列组件的 BoxLayout 类。
常用方法:
- addLayoutComponent(Component CMP，Object obj): 此类不使用它。
- getLayoutAlignmentX(容器 con): 返回容器沿 X 轴的对齐方式。
- getLayoutAlignmentY(容器 con): 返回容器沿 Y 轴的对齐方式。
- 最大尺寸(容器 con): 返回目标容器可用于布局其包含的组件的最大尺寸。
- minimumLayoutSize(Container con):返回布局指定目标容器中包含的组件所需的最小尺寸。
- removeLayoutComponent(Component CMP):此类不使用它。
- layoutContainer(容器 tar): 当需要布局指定的容器时，由 AWT 调用。
下面的程序说明了 BoxLayout 类:
-
Program 1: In the below program we are arranging several JLabel components in a JFrame. We create 1 JPanel component named “Panel” and 5 JButton components named “jbtn1“, “jbtn2“, “jbtn3“, “jbtn4“, “jbtn5“. Also, we are creating a BoxLayout component named “boxlayout” and one JFrame class and then add them to the JFrame by using add() method. We set the visibility of the frame using setvisible() method. The layout is set using setLayout() method.
```java // Java program to demonstrate BoxLayout // class along X-Axis import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.BoxLayout; import javax.swing.Box; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import java.awt.Insets; import java.awt.Dimension;
// taking a class Demo public class Demo {
// Main Method public static void main(String[] args) {
// Function to set up the window frame. JFrame.setDefaultLookAndFeelDecorated(true);
// Creating Object of "JFrame" class JFrame frame = new JFrame("BoxLayout Example X_AXIS");
// Declaration of objects of JButton class. JButton jbtn1, jbtn2, jbtn3, jbtn4, jbtn5;
// Function to set the default // close operation of JFrame the. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set the panel to add buttons JPanel panel = new JPanel();
// Creating Object of "boxlayout" in // X_Axis from left to right BoxLayout boxlayout = new BoxLayout(panel, BoxLayout.X_AXIS);
// to set the box layout panel.setLayout(boxlayout);
// Set border for the panel panel.setBorder(new EmptyBorder(new Insets(100, 150, 100, 150)));
// Initialization of object "jb1" of JButton class. jbtn1 = new JButton("Button 1");
// Initialization of object "jb2" of JButton class. jbtn2 = new JButton("Button 2");
// Initialization of object "jb3" of JButton class. jbtn3 = new JButton("Button 3");
// Initialization of object "jb4" of JButton class. jbtn4 = new JButton("Button 4");
// Initialization of object "jb5" of JButton class. jbtn5 = new JButton("Button 5");
// Adding JButton "jb1" on JFrame panel.add(jbtn1);
// Adding JButton "jb2" on JFrame panel.add(jbtn2);
// Adding JButton "jb3" on JFrame panel.add(jbtn3);
// Adding JButton "jb4" on JFrame panel.add(jbtn4);
// Adding JButton "jb5" on JFrame panel.add(jbtn5);
// Function to set the panel of JFrame. frame.add(panel);
// Function to use the pack of JFrame. frame.pack();
// Function to set visible status of JFrame. frame.setVisible(true); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/gfgbl1.mp4 * Program 2: The following program arranges the components along Y-AXIS in a JFrame. We create 1 JPanel components named “Panel”, 5 JButton components named “jbtn1“, “jbtn2“, “jbtn3“, “jbtn4“, “jbtn5“, a BoxLayout components named “boxlayout” and a one JFrame class and then add them to the JFrame by using add() method. We will set the visibility of the frame by using setvisible() method. The layout is set by using setLayout() method.
```java // Java program to demonstrate BoxLayout // class along Y-Axis import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.BoxLayout; import javax.swing.Box; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import java.awt.Insets; import java.awt.Dimension;
// construct a class Demo_1 public class Demo_1 {
// Main Method public static void main(String[] args) {
// Function to set up the window frame. JFrame.setDefaultLookAndFeelDecorated(true);
// Creating Object of "JFrame" class JFrame frame = new JFrame("BoxLayout Example Y_AXIS");
// Declaration of objects of JButton class. JButton jbtn1, jbtn2, jbtn3, jbtn4, jbtn5;
// Function to set the default close operation of JFrame the. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Set the panel to add buttons JPanel panel = new JPanel();
// Creating Object of "boxlayout" in Y_Axis from top to down BoxLayout boxlayout = new BoxLayout(panel, BoxLayout.Y_AXIS);
// to set the box layout panel.setLayout(boxlayout);
// Set border for the panel panel.setBorder(new EmptyBorder(new Insets(100, 150, 100, 150)));
// Initialization of object "jb1" of JButton class. jbtn1 = new JButton("Button 1");
// Initialization of object "jb2" of JButton class. jbtn2 = new JButton("Button 2");
// Initialization of object "jb3" of JButton class. jbtn3 = new JButton("Button 3");
// Initialization of object "jb4" of JButton class. jbtn4 = new JButton("Button 4");
// Initialization of object "jb5" of JButton class. jbtn5 = new JButton("Button 5");
// Adding JButton "jb1" on JFrame panel.add(jbtn1);
// Adding JButton "jb2" on JFrame panel.add(jbtn2);
// Adding JButton "jb3" on JFrame panel.add(jbtn3);
// Adding JButton "jb4" on JFrame panel.add(jbtn4);
// Adding JButton "jb5" on JFrame panel.add(jbtn5);
// Function to set the panel of JFrame. frame.add(panel);
// Function to use the pack of JFrame. frame.pack();
// Function to set visible status of JFrame. frame.setVisible(true); } } ```
输出:
https://media.geeksforgeeks.org/wp-content/uploads/Untitled-17.mp4
注意:上述程序可能无法在在线 IDE 中运行。请使用离线编译器。
参考:https://docs . Oracle . com/javase/7/docs/API/javax/swing/box layout . html
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