Java JTextField未编辑jtexput
我正在尝试制作一个简单的程序,其中有一个文本输入字段和一个标签,当您向该字段输入内容时,它将输入存储为“testInput”,并将标签更改为该文本。我正在使用Eclipse的WindowBuilder插件来实现这一点,它以前工作得很好。现在的情况是,它将接收文本,但不会将其发送回jLabel。这是我的密码:Java JTextField未编辑jtexput,java,eclipse,swing,jlabel,jtextfield,Java,Eclipse,Swing,Jlabel,Jtextfield,我正在尝试制作一个简单的程序,其中有一个文本输入字段和一个标签,当您向该字段输入内容时,它将输入存储为“testInput”,并将标签更改为该文本。我正在使用Eclipse的WindowBuilder插件来实现这一点,它以前工作得很好。现在的情况是,它将接收文本,但不会将其发送回jLabel。这是我的密码: package interest; import java.awt.EventQueue; import javax.swing.JFrame; import java.awt.Grid
package interest;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.GridBagLayout;
import javax.swing.JTextField;
import java.awt.GridBagConstraints;
import javax.swing.JLabel;
import java.awt.Insets;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class TestWin {
String testInput;
private JFrame frame;
private JTextField txtTest;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
TestWin window = new TestWin();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public TestWin() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridBagLayout gridBagLayout = new GridBagLayout();
gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0};
gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0, 0};
gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 1.0, Double.MIN_VALUE};
gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
frame.getContentPane().setLayout(gridBagLayout);
txtTest = new JTextField();
//Change label when enter is pressed
txtTest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
testInput = txtTest.getText();
txtTest.setText(testInput);
}
});
txtTest.setText("test");
GridBagConstraints gbc_txtTest = new GridBagConstraints();
gbc_txtTest.insets = new Insets(0, 0, 5, 0);
gbc_txtTest.fill = GridBagConstraints.HORIZONTAL;
gbc_txtTest.gridx = 5;
gbc_txtTest.gridy = 1;
frame.getContentPane().add(txtTest, gbc_txtTest);
txtTest.setColumns(10);
JLabel lblTest = new JLabel("test");
GridBagConstraints gbc_lblTest = new GridBagConstraints();
gbc_lblTest.gridx = 5;
gbc_lblTest.gridy = 4;
frame.getContentPane().add(lblTest, gbc_lblTest);
}
}
我确信我犯了一个非常简单的错误,所以非常感谢您的帮助 Put
JLabel lblTest = new JLabel("test");
在initialize()
(或txtest.addActionListener…
)的开头,然后替换
txtTest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
testInput = txtTest.getText();
txtTest.setText(testInput);
}
});
为了
'txtest.setText(testInput);'在“testInput=txtest.getText();”之后没有任何意义是否要编写“lblTest.setText(testInput);”?如果您建议只替换一行代码,而不是显示两个六行代码块(除一行代码外,所有代码块的行都相同),那么您的答案将更容易理解。这会迫使读者玩一个耗时的“发现差异”游戏。在替换的行旁边添加注释。@VGR确定,但其他几行文字提供了上下文,并避免了回答者玩OP:P的“我不知道在哪里进行更改”游戏——但比较他们所拥有的和他们应该更改的内容也很有帮助;)
txtTest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
testInput = txtTest.getText();
lblTest.setText(testInput); //This line was changed.
}
});