Question

我需要重复使用面板中的文本字段来存储值。

请参阅冗长但非常简单的代码。

基本上我正在做的是

创建包含文本字段的面板
创建具有可变名称的类Holder对象数组，该名称将存储来自textfield的值

class Holder
{
    String name;
}


public class Yummy12 extends Holder {
    int t;

    public static void main(String args[])
    {
        new Yummy12();
    }

    Holder[] obj=new Holder[5];

    JButton button1=new JButton("add another one");
    JButton button2=new JButton("exit");
    JPanel panel=new JPanel();
    JTextField textfield=new JTextField("Enter some text here");
    JLabel label1=new JLabel();
    JFrame frame=new JFrame();

    Yummy12()
    {
        for(int i=0;i<5;i++)
        {
            obj[i]=new Holder();
        }

        //set component bounds (only needed by Absolute Positioning)
        label1.setBounds (165, 75, 100, 25);
        textfield.setBounds (350, 75, 100, 25);
        button1.setBounds (170, 230, 100, 25);
        button2.setBounds (360, 230, 100, 25);

        panel.add(label1);
        panel.add(textfield);
        panel.add(button1);
        panel.add(button2);

        frame.add(panel);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);

        frame.setExtendedState(JFrame.MAXIMIZED_BOTH);

        ListenForButton1 lrbutton1=new ListenForButton1();
        ListenForButton1 lrbutton2=new ListenForButton1();

        button1.addActionListener((ActionListener)lrbutton1);
        button2.addActionListener((ActionListener)lrbutton2);
    }        

    private class ListenForButton1 implements ActionListener
    {   
        @Override
        public void actionPerformed(ActionEvent e)
        {
            if(e.getSource()==button1)
            {
                obj[t].name=textfield.getText();
                t++;

                //what code should come here so that i reuse the same panel again??? 

                if(e.getSource()==button2)
                {
                    System.exit(0);
                }
            }
        }
    }

Answer 1

您的if块需要像这样进行修改才能使其正常工作：

        if(e.getSource()==button1) {
            obj[t].name=textfield.getText();
            t++;

            //what code should come here so that i reuse the same panel again??? 
            textfield.setText(""); // clears the textfield for re-use

        } else if(e.getSource()==button2){
                System.exit(0);
        }

希望这有帮助

重用面板来存储值

1 个答案: