Remove spaces from certain JtextField in java netbeans

问题

I want to remove spaces from a JtextField, so when the user click the button it automatically removes the space from the text he/she wrote.

回答1:

simply, you need to add an action listener to the button which the user is going to click. for example: the button will be for posting something. "POST"

public class YourProject extends JFrame implements ActionListener{

JtextField text = new JtextField();
JButton post = new JButton("POST");

public YourProject(){

add(text);
add(post);
post.addactionlistener(this);
setVisible(true);

}



 @Override
public void actionPerformed(ActionEvent e) {

if(e.getSource()==post) {

String removed = text.getText().trim();

System.out.println(removed);

}

If the user writes "Hello World" then clicks post, the output will be "HelloWorld". hope this helps.

回答2:

This would replace every space with empty string:

String text = txtField.getText().replaceAll("\\s+", "");

// or just
// String text = txtField.getText().replace(" ", "");

If you just need to remove trailing and leading spaces, then do this:

String text = txtField.getText().trim();

---

and finally set your new text into the text field:

textField.setText(text);

回答3:

String sessi = textField.getText();
System.out.println(sessi.replaceAll(" ",""));

would work for you.

来源：https://stackoverflow.com/questions/15879695/remove-spaces-from-certain-jtextfield-in-java-netbeans