Java:这一行有多个标记——标记上的语法错误“)”，;期望-标记的语法错误"("，{期望

I am unable to find the mistake. Eclipse is giving me this error. Every { } is matching. Please help.

我找不到这个错误。Eclipse给了我这个错误。每一个{}都是匹配的。请帮助。

Multiple markers at this line - Syntax error on token “)”, ; expected - Syntax error on token “(”, { expected

这一行的多个标记——标记上的语法错误“)”;期望-标记的语法错误"("，{期望

My code is as follows :

我的代码如下:

import javax.swing.*;

import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JTextField;

import matlabcontrol.MatlabConnectionException;
import matlabcontrol.MatlabInvocationException;

import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;

class BackgroundImageJFrame1 extends JFrame {

public BackgroundImageJFrame1() {

    JButton b1;
    JLabel l1;
    final JFileChooser fc = null;
    final JTextField textField;
    final JButton jb1 = null;
    setTitle("Parallel Session");
    setSize(400, 400);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);

    getContentPane().setLayout(new BorderLayout());
    setContentPane(new JLabel(new ImageIcon("giphy.gif")));
    getContentPane().setLayout(new FlowLayout());

    l1 = new JLabel("Parallel Simulation Model");
    l1.setForeground(Color.RED);
    l1.setFont(new Font("Palatino Linotype", Font.BOLD, 20));
    l1.setToolTipText("Getting Started");
    l1.setBounds(86, 54, 219, 45);

    b1 = new JButton("\n\n LET'S GO!");
    b1.setVerticalAlignment(SwingConstants.BOTTOM);
    b1.setFont(new Font("Microsoft Sans Serif", Font.PLAIN, 14));
    b1.setForeground(Color.BLUE);
    b1.setBackground(Color.YELLOW);
    b1.setToolTipText("To begin click here!");
    b1.setBounds(120, 210, 272, 186);

    JProgressBar progressBar = new JProgressBar();
    progressBar.setIndeterminate(true);
    progressBar.setToolTipText("Progress");
    progressBar.setBounds(130, 207, 146, 14);

    getContentPane().add(l1);
    getContentPane().add(b1);
    getContentPane().add(progressBar);
    // Just for refresh :) Not optional!
    setSize(399, 399);
    setSize(400, 400);

    b1.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            JFrame Frame1 = new JFrame();
            final JPanel panel1 = new JPanel();

            JLabel j1 = new JLabel("Select your model");
            panel1.add(j1);
            JTextField jt1 = new JTextField();
            jt1.setPreferredSize(new Dimension(160, 20));
            panel1.add(jt1);
            new JButton("Browse");
            jb1.setPreferredSize(new Dimension(100, 20));
            panel1.add(jb1);

            JLabel label1 = new JLabel("Enter the number instances");
            Frame1.setVisible(true);
            Frame1.setSize(300, 300);
            Frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            panel1.add(label1);
            Frame1.getContentPane().add(panel1);
            panel1.setBackground(Color.CYAN);

            final JTextArea t1 = new JTextArea("Enter here");
            panel1.add(t1);

            JButton b11 = new JButton("SET");
            panel1.add(b11);

            jb1.addActionListener(new java.awt.event.ActionListener() {
                @Override
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    btnBrowseActionPerformed(null);
                }

            });
            private void btnBrowseActionPerformed(java.awt.event.ActionEvent evt) {
                if (fc == null) {
                    fc = new JFileChooser(".");
                }

                // Show it.
                int returnVal = fc.showOpenDialog(null);

                // Process the results.
                if (returnVal == JFileChooser.APPROVE_OPTION) {
                    textField.setText(fc.getSelectedFile().getPath());
                } else {
                    textField.setText("");
                }

                // Reset the file chooser for the next time it's shown.
                fc.setSelectedFile(null);

            }


             //done
                b11.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    String a = t1.getText();
                    System.out.println(" " + a);
                    try {
                        int itr = Integer.parseInt(a);
                        for (int i = 1; i <= itr; i++) {
                            multi m = new multi();

                            JLabel l1 = new JLabel("MANUEVER DETAILS");
                            JTextArea p = new JTextArea(
                                    "Enter the manuever here");
                            panel1.add(l1);
                            panel1.add(p);
                        }
                    } catch (InvocationTargetException
                            | InterruptedException
                            | MatlabConnectionException
                            | MatlabInvocationException e) {
                        // TODO Auto-generated catch block
                        ((Throwable) e).printStackTrace();
                    }

                }
            });

        }
    });
}

public static void main(String[] args) throws MatlabConnectionException,
        MatlabInvocationException, IOException {

    EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            try {
                System.out.println("hey");

                new BackgroundImageJFrame1();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    });

}


}

4 个解决方案

#1

you have a method in a method, put btnBrowseActionPerformed method outside of BackgroundImageJFrame1

方法中有一个方法，将btnBrowseActionPerformed方法放在BackgroundImageJFrame1之外

#2

You can not declare method inside method.

你不能在方法里面声明方法。

Take out btnBrowseActionPerformed method outside BackgroundImageJFrame1() constructor.

在BackgroundImageJFrame1()构造函数之外取出btnBrowseActionPerformed执行的方法。

This code is written inside method.

此代码是在方法内部编写的。

jb1.addActionListener(new java.awt.event.ActionListener() {

and this is a new method which should not be inside any method.

这是一种不应该在任何方法内的新方法。

private void btnBrowseActionPerformed(java.awt.event.ActionEvent evt) {

Note: As mentioned by @Ranjeet, you need to declare class level variables outside constructor, you can initialize inside constructor.

注意:正如@Ranjeet所提到的，您需要在构造函数外部声明类级变量，您可以初始化构造函数。

#3

You need to write implementation of btnBrowseActionPerformed method outside constructor.
您需要在构造函数之外编写btnBrowseActionPerformed方法的实现。
Declare final JFileChooser fc = null; final JTextField textField;at class level not in constructor.
声明最终的JFileChooser fc = null;最后的JTextField textField;在类级而不是在构造函数中。
It resolve your compilation error problem.
它解决了编译错误问题。

#4

In the code that was posted, the anonymous class definition ended after the actionPerformed() method using the symbols });

在所发布的代码中，匿名类定义在actionPerformed()方法使用symbol}之后结束;

The btnBrowseActionPerformed() method is a private method of the same class and the class definition should include that method. Basically the }); that closes the anonymous class should be after the btnBrowseActionPerformed() definition.

btnBrowseActionPerformed()方法是同一个类的私有方法，类定义应该包含该方法。基本上});关闭匿名类应该在btnBrowseActionPerformed()定义之后。

jb1.addActionListener(new java.awt.event.ActionListener() {
                @Override
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    btnBrowseActionPerformed(null);
                }

            // do not close the anonymous inner class here
            //the below method belongs to the anonymous class.
            private void btnBrowseActionPerformed(java.awt.event.ActionEvent evt) {
                if (fc == null) {
                    fc = new JFileChooser(".");
                }

                // Show it.
                int returnVal = fc.showOpenDialog(null);

                // Process the results.
                if (returnVal == JFileChooser.APPROVE_OPTION) {
                    textField.setText(fc.getSelectedFile().getPath());
                } else {
                    textField.setText("");
                }

                // Reset the file chooser for the next time it's shown.
                fc.setSelectedFile(null);

            }
            });//close it here instead

#1