Implemented with getToolTipText method override
https://docs.oracle.com/javase/8/docs/api/javax/swing/JComponent.html#getToolTipText-java.awt.event.MouseEvent-
package test.swing;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
// dynamic tooltip
public class MainTest {
public static void main(String[] args) {
MainUI mainUI = new MainUI();
mainUI.setVisible(true);
}
}
class ToolTipButton extends JButton {
boolean mIsNum = true;
public ToolTipButton(String text) {
super(text);
}
// 1. use setToolTipText
@Override
public String getToolTipText(MouseEvent event) {
if (mIsNum) {
setToolTipText("0123456789");
}
else {
setToolTipText("ABCDEFG");
}
mIsNum = !mIsNum;
return super.getToolTipText(event);
}
// 2. return text directly
@Override
public String getToolTipText(MouseEvent event) {
String text = "";
if (mIsNum) {
text = "0123456789";
}
else {
text = "ABCDEFG";
}
mIsNum = !mIsNum;
return text;
}
}
class MainUI extends JFrame {
MainUI() {
setPreferredSize(new Dimension(400, 300));
setLayout(new FlowLayout());
JButton button = new ToolTipButton("TEST");
button.setToolTipText("");
button.setPreferredSize(new Dimension(100, 100));
add(button);
pack();
}
}
Multi-line tooltip
setToolTipText("<html>a<br>b</html>");
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