在Java中找不到符号'JTextField'

Question

import javax.swing.*;

public class Test {
   public static void main(String[] args) {
     JButton jbtOK = new JButton("OK");
     JButton jbtCancel = new JButton("Cancel");
     JLabel jlblName = new JLabel("Enter your name: ");
     JTextField jtfName = JTextField("Type Name Here");
     JCheckBox jchkBold = new JCheckBox("Bold");
     JCheckBox jchkItalic = new JCheckBox("Italic");
     JRadioButton jrbRed = new JRadioButton("Red");
     JRadioButton jrbYellow = new JRadioButton("Red");
     JComboBox jcboColor = new JComboBox(new String[] {"Freshman",
       "Sophmore", "Junior", "Senior"});
     JPanel panel = new JPanel();
     panel.add(jbtOK);
     panel.add(jbtCancel);
     panel.add(jlblName);
     panel.add(jtfName);
     panel.add(jchkBold);
     panel.add(jchkItalic);
     panel.add(jrbRed);
     panel.add(jrbYellow);
     panel.add(jcboColor);

    JFrame frame = new JFrame();
    frame.add(panel);
    frame.setTitle("Show GUI Components");
    frame.setSize(450, 100);
    frame.setLocation(200, 100);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
  }
}

我尝试编译时得到的输出

gurbhej@Nanda:~/Dropbox/Programming/Java Programs/Test$ javac Test.java 
Test.java:9: error: cannot find symbol
JTextField jtfName = JTextField("Type Name Here");
                     ^
symbol:   method JTextField(String)
location: class Test
Note: Test.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error
gurbhej@Nanda:~/Dropbox/Programming/Java Programs/Test$ 

我从一本书中得到了这个例子,也没有从勘误表中找到任何东西.为什么我收到此错误？这是我第一次使用Java中的GUI东西,所以我不知道如何解决这个问题.JTextField是否会退出Java库或者是否存在我遗漏的内容？

Answer 1

你new以前忘了JTextField,所以代码将是:

JTextField jtField = new JTextField("");