本文最后更新于：3 个月前

上代码

import javax.swing.*;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;

/**优化的swing 输入框
 * 获取鼠标焦点之后可以清除提示文字
 * @author Tars
 */
public class myTextField extends JTextField {
        private String text;



        public myTextField(String text, int columns) {
            super(text, columns);
            this.text = text;
            this.addFocusListener(new FocusAdapter() {
                @Override
                public void focusGained(FocusEvent e) {
                    super.focusGained(e);
                    if(myTextField.this.getText().equals(myTextField.this.text))    myTextField.this.setText("");
                }

                @Override
                public void focusLost(FocusEvent e) {
                    super.focusLost(e);
                    if(myTextField.this.getText().isEmpty())    myTextField.this.setText(myTextField.this.text);
                }
            });
        }

    }