Swing awt 组件方法 getName from setName？

Question

Trying to add a getName() method to a setName() based on this method void java.awt.Component.setName(String arg0) but without luck. The button below is loaded into the contentPane.

I need to add an actionlistener to a button instantiated in this method (either based on setName or something else similar):

public JButton JButtonComponent(String btnRef) {
    
    button = new JButton("Convert to binary");
    button.setMaximumSize(new Dimension(width/4,unitHeight));
    
    button.addActionListener(this);
    button.setName("Binary"); // my set name 
    
    return button;
}

This is my actionPerformed method:

@Override
public void actionPerformed(ActionEvent e) {

    System.out.println(e.getSource());

}

And the above system print outputs:

javax.swing.JButton[Binary,270,14,90x33,alignmentX=0.0,alignmentY=0.5,flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,disabledSelectedIcon=,margin=javax.swing.plaf.InsetsUIResource[top=2,left=14,bottom=2,right=14],paintBorder=true,paintFocus=true,pressedIcon=,rolloverEnabled=true,rolloverIcon=,rolloverSelectedIcon=,selectedIcon=,text=Convert,defaultCapable=true]

My question is how do i get the name value i've defined in JButtonComponent from the ActionEvent? - The setName value is clearly in the ActionEvent e but no method seems to be right for the object to extract the value so i can do a compare. And is this the best method to define an "id" like you would in HTML if you were to compare?

Answer 1

Your JButton definition code should be:

button.setText("Binary");

Your ActionListener code should be:

JButton button = (JButton) event.getSource();
String text = button.getText();

You can also use the JButton ActionCommand String to pass along additional; information.

Answer 2

either based on setName or something else similar

Don't use getName/setName for something like this.

There is already an API that allows you to use an "action command".

For a JButton you can use:

button.setActionCommand("Binary");

Then in the ActionListener you use:

String command = e.getActionCommand();

The setName value is clearly in the ActionEvent

No it isn't. A reference to the source object is contained in the ActionEvent. You need to first access the source before you can access the methods of the source object:

JButton button = (JButton)e.getSource();
System.out.println( button.getName() );