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📜  Java Swing-JFrame

📅  最后修改于: 2020-09-30 09:24:17             🧑  作者: Mango

Java JFrame

javax.swing.JFrame类是一种继承java.awt.Frame类的容器。 JFrame的工作原理类似于主窗口，在其中添加了标签，按钮，文本字段等组件以创建GUI。

与Frame不同，JFrame可以选择使用setDefaultCloseOperation(int)方法来隐藏或关闭窗口。

嵌套类

Modifier and Type Class Description
protected class JFrame.AccessibleJFrame This class implements accessibility support for the JFrame class.

领域

Modifier and Type Field Description
protected AccessibleContext accessibleContext The accessible context property.
static int EXIT_ON_CLOSE The exit application default window close operation.
protected JRootPane rootPane The JRootPane instance that manages the contentPane and optional menuBar for this frame, as well as the glassPane.
protected boolean rootPaneCheckingEnabled If true then calls to add and setLayout will be forwarded to the contentPane.

建设者

Constructor Description
JFrame() It constructs a new frame that is initially invisible.
JFrame(GraphicsConfiguration gc) It creates a Frame in the specified GraphicsConfiguration of a screen device and a blank title.
JFrame(String title) It creates a new, initially invisible Frame with the specified title.
JFrame(String title, GraphicsConfiguration gc) It creates a JFrame with the specified title and the specified GraphicsConfiguration of a screen device.

有用的方法

Modifier and Type Method Description
protected void addImpl(Component comp, Object constraints, int index) Adds the specified child Component.
protected JRootPane createRootPane() Called by the constructor methods to create the default rootPane.
protected void frameInit() Called by the constructors to init the JFrame properly.
void setContentPane(Containe contentPane) It sets the contentPane property
static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated) Provides a hint as to whether or not newly created JFrames should have their Window decorations (such as borders, widgets to close the window, title…) provided by the current look and feel.
void setIconImage(Image image) It sets the image to be displayed as the icon for this window.
void setJMenuBar(JMenuBar menubar) It sets the menubar for this frame.
void setLayeredPane(JLayeredPane layeredPane) It sets the layeredPane property.
JRootPane getRootPane() It returns the rootPane object for this frame.
TransferHandler getTransferHandler() It gets the transferHandler property.

JFrame示例

import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Jpanel;
public class JFrameExample {
public static void main(String s[]) {
JFrame frame = new JFrame("JFrame Example");
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JLabel label = new JLabel("JFrame By Example");
JButton button = new JButton();
button.setText("Button");
panel.add(label);
panel.add(button);
frame.add(panel);
frame.setSize(200, 300);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

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