Java, change JLabel text on click

Question

I'm new to this site and to Java programming and I'd greatly appreciate a bit of help. I'm trying to make a really simple program using SWING where the user clicks a button and a label's text changes from "Hello" to "Bonjour". These are the two errors I'm getting:

java:6: error: Lab4Part1 is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener public class Lab4Part1 extends JFrame implements ActionListener { java:25: error: cannot find symbol label.setText("Bonjour");

Any ideas? My code is here:

 import javax.swing.*; import java.awt.*; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; public class Lab4Part1 extends JFrame implements ActionListener { public Lab4Part1() { super("Lab 4 Part 1"); Container contentPane = getContentPane(); JPanel panel = new JPanel(); contentPane.add(panel); setSize(400, 100); setVisible(true); JLabel label = new JLabel("Hello"); panel.add(label); JButton button = new JButton("Translate to French"); panel.add(button); button.addActionListener(this); } public void handle(ActionEvent event) { label.setText("Bonjour"); } public static void main(String[] args) { Lab4Part1 myFrame = new Lab4Part1(); myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } }

I've just fixed the first problem, sorry! Dumb mistake on my part, just about how I named my method. However, the second one still stands. The action method can't find the "label" object. — ProioxisPrime
– ProioxisPrime, Commented Dec 23, 2017 at 17:49
edit your question to eliminate the first problem. The second problem is nothing but basic Java, passing references to where needed and knowledge of variable scope (look it up). — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Dec 23, 2017 at 17:58

Alex Cuadrón · Accepted Answer · 2017-12-23 17:57:17Z

You have to declare the JLabel in the class directly so you can access it from the handle function:

public class Lab4Part1 extends JFrame implements ActionListener { JLabel label; public Lab4Part1() { super("Lab 4 Part 1"); Container contentPane = getContentPane(); JPanel panel = new JPanel(); contentPane.add(panel); setSize(400, 100); setVisible(true); label = new JLabel("Hello"); panel.add(label); JButton button = new JButton("Translate to French"); panel.add(button); button.addActionListener(this); } public void handle(ActionEvent event) { label.setText("Bonjour"); }

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