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📜  Java Swing-JCheckBoxMenuItem

📅  最后修改于: 2020-09-30 06:05:33             🧑  作者: Mango

Java JCheckBoxMenuItem

JCheckBoxMenuItem类表示可包含在菜单中的复选框。 CheckBoxMenuItem可以具有与之关联的文本或图形图标或两者。可以选择或取消选择MenuItem。 MenuItem可以通过操作进行配置和控制。

嵌套类

Modifier and Type Class Description
protected class JCheckBoxMenuItem.AccessibleJCheckBoxMenuItem This class implements accessibility support for the JcheckBoxMenuItem class.

建设者

Constructor Description
JCheckBoxMenuItem() It creates an initially unselected check box menu item with no set text or icon.
JCheckBoxMenuItem(Action a) It creates a menu item whose properties are taken from the Action supplied.
JCheckBoxMenuItem(Icon icon) It creates an initially unselected check box menu item with an icon.
JCheckBoxMenuItem(String text) It creates an initially unselected check box menu item with text.
JCheckBoxMenuItem(String text, boolean b) It creates a check box menu item with the specified text and selection state.
JCheckBoxMenuItem(String text, Icon icon) It creates an initially unselected check box menu item with the specified text and icon.
JCheckBoxMenuItem(String text, Icon icon, boolean b) It creates a check box menu item with the specified text, icon, and selection state.

方法

Modifier Method Description
AccessibleContext getAccessibleContext() It gets the AccessibleContext associated with this JCheckBoxMenuItem.
Object[] getSelectedObjects() It returns an label or null if the check box is not selected.
boolean getState() It returns the selected-state of the item.
String getUIClassID() It returns the name of the L&F class that renders this component.
protected String paramString() It returns a string representation of this JCheckBoxMenuItem.
void setState(boolean b) It sets the selected-state of the item.

Java JCheckBoxMenuItem示例

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractButton;
import javax.swing.Icon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class JavaCheckBoxMenuItem {
public static void main(final String args[]) {
JFrame frame = new JFrame("Jmenu Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menuBar = new JMenuBar();
// File Menu, F - Mnemonic
JMenu fileMenu = new JMenu("File");
fileMenu.setMnemonic(KeyEvent.VK_F);
menuBar.add(fileMenu);
// File->New, N - Mnemonic
JMenuItem menuItem1 = new JMenuItem("Open", KeyEvent.VK_N);
fileMenu.add(menuItem1);

JCheckBoxMenuItem caseMenuItem = new JCheckBoxMenuItem("Option_1");
caseMenuItem.setMnemonic(KeyEvent.VK_C);
fileMenu.add(caseMenuItem);

ActionListener aListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
AbstractButton aButton = (AbstractButton) event.getSource();
boolean selected = aButton.getModel().isSelected();
String newLabel;
Icon newIcon;
if (selected) {
newLabel = "Value-1";
} else {
newLabel = "Value-2";
}
aButton.setText(newLabel);
}
};

caseMenuItem.addActionListener(aListener);
frame.setJMenuBar(menuBar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}

输出：