Checkbox class in java

CheckBox In Java

A check box is a graphical component that can be in either an "on" (true) or "off" (false) state. Clicking on a check box changes its state from "on" to "off," or from "off" to "on."

Constructor :-

1.public Checkbox() throws HeadlessException

Creates a check box with no label.

The state of this check box is set to "off," and it is not part of any check box group.

2. public Checkbox(String label)

Creates a check box with the specified label.

The state of this check box is set to "off,"

 it is not part of any check box group.

 Checkbox(String label,boolean state) 

Creates a check box with the specified label and sets the specified state. This check box is not part of any check box group.

4. Checkbox(String label, CheckboxGroup group, boolean state)

Creates a check box with the specified label, in the specified check box group, and set to the specified state. 

  Checkbox constructors:

• Checkbox( )
• Checkbox(String str)
• Checkbox(String str, boolean on)
• Checkbox(String str, boolean on, CheckboxGroup cbGroup)
• Checkbox(String str, CheckboxGroup cbGroup, boolean on)
• These methods 
• boolean getState( )
• void setState(boolean on)
• String getLabel( )
• void setLabel(String str)
• Handling Check Boxes
• Each time a check box is selected or deselected, an item event is generated
• Each listener implements the ItemListener interface
• Interface defines the itemStateChanged( ) method.

 Methods in CheckBox

• getLabel
• public String getLabel() Gets the label of this check box. Returns the label of this check box, or null if this check box has no label.
• setLabel
• public void setLabel(String label)
• Sets this check box's label to be the string argument.
•  
• getState
• public boolean getState()
• Determines whether this check box is in the "on" or "off" state.
• checkbox1.getState());
• g.drawString("Java: " + java.getState(),10,60);
• setState
• public void setState(boolean state Sets the state of this check box to the specified state.
• Enabling Checkbox checkbox1.setEnabled(false);
• Checking enable or not
• (checkbox1.isEnabled()

 Checkbox groups

• Checkbox groups are collections of checkboxes with the special property that no more than one checkbox in the same group can be selected at a time. The checkboxes in a CheckboxGroup are often called radio buttons. 
• CheckboxGroup cbg = new CheckboxGroup();
• To make check boxes act like radio buttons, use this constructor for each Checkbox in the group.
• public Checkbox(String label, CheckboxGroup cbg, boolean checked)The label is the label for this Checkbox. The CheckboxGroup is the group you want this Checkbox to belong to and must already exist.