Java方法调用预期 [英] Java Method Call Expected

问题描述

这是一个java程序，有两个按钮用于更改整数值并显示它。
但是在IntelliJIDEA中，两行

This is a java program with two buttons used to change an integer value and display it. However in IntelliJIDEA the two lines with

increase.addActionListener(incListener());
decrease.addActionListener(decListener());

继续显示错误'预期方法调用'。

我不知道如何解决这个问题。

我们将非常感谢任何帮助

谢谢

keep displaying errors 'Method call expected'.

I am not sure what to do to fix this.

Any help will be greatly appreciated

Thanks

注意：完整的代码附在下面。

Note: the full code is attached below.

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Main extends JDialog {
public JPanel contentPane;
public JButton decrease;
public JButton increase;
public JLabel label;

public int number;

public Main() {
    setContentPane(contentPane);
    setModal(true);

    increase = new JButton();
    decrease = new JButton();
    increase.addActionListener(incListener());
    decrease.addActionListener(decListener());

    number = 50;
    label = new JLabel();
}

public class incListener implements ActionListener {
    public void actionPerformed (ActionEvent event) {
        number++;
        label.setText("" + number);
    }
}

public class decListener implements ActionListener {
    public void actionPerformed (ActionEvent event) {
        number--;
        label.setText("" + number);
    }
}

public static void main(String[] args) {
    Main dialog = new Main();
    dialog.pack();
    dialog.setVisible(true);
    System.exit(0);

}
}

推荐答案

incListener和declListener是类，而不是方法。

incListener and declListener are classes, not methods.

尝试

increase.addActionListener(new incListener());

btw，重命名你的班级名称，使它们以大写字母开头

btw, rename your classes names to make them start with an uppercase

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