仅允许将数字和符号（-）键入到JTextField中

使用documentFilter：

NumberOnlyFilter.java：

import javax.swing.*;import javax.swing.text.*;import java.util.regex.*;public class NumberonlyFilter extends documentFilter{    public void insertString(documentFilter.FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException    {        StringBuilder sb = new StringBuilder();        sb.append(fb.getdocument().getText(0, fb.getdocument().getLength()));        sb.insert(offset, text);        if(!containsOnlyNumbers(sb.toString())) return;        fb.insertString(offset, text, attr);    }    public void replace(documentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attr) throws BadLocationException    {        StringBuilder sb = new StringBuilder();        sb.append(fb.getdocument().getText(0, fb.getdocument().getLength()));        sb.replace(offset, offset + length, text);        if(!containsOnlyNumbers(sb.toString())) return;        fb.replace(offset, length, text, attr);    }        public boolean containsOnlyNumbers(String text)    {        Pattern pattern = Pattern.compile("([+-]{0,1})?[\d]*");        Matcher matcher = pattern.matcher(text);        boolean isMatch = matcher.matches();        return isMatch;    }}

然后您可以像这样使用它：

((Abstractdocument)yourTxtField.getdocument()).setdocumentFilter(new NumberonlyFilter());