您可以使用inputField.setText("");将任何字段的文本设置为空。

你的代码片段很短，我不知道，它是什么，除了给文本字段的名称？
总之，在genereal中，你的程序可能看起来像这样：

public class calculator implements ActionListener{
    JTextField inputXTextField;
    JTextField inputYTextField;
    JButton bClear=new JButton("clear all");
    JPanel panel;

    private void init(){
        bClear.addActionListener(this);
        panel.add(bClear);
        panel.add....
    }

    void actionPerformed(ActionEvent e){
        Object obj=e.getSource();
        if (obj=bClear){
            inputXTextField=new JTextField(...);
            or
            inputXTextField.setText(""); //just to empty the field
            .
            .
        }
    }

JTextField textField1, textField2; //Or as many as you want;
JButton clear;

private void init(){
    textField1 = new JTextField(); //Do this for all text fields.
    clear=new JButton("C");
    clear.addActionListener(this);
    //Add controls to the panel/frame
}

void actionPerformed(ActionEvent e){
    Object obj=e.getSource();
    if (e.getSource==clear){
       textField1.setText("");
       textField2.setText("");
       //... For all the textFields you have
    }
}