java – 如何检查所有JTexField是否为空？

我正在使用for循环来创建9个JTextFields,这很好用.我的问题是,我想一次检查所有这些JTextField是否为空.我知道有一种方法：

if (textbox.getText().trim().equals(""))

检查JTextField是否为空,但我不确定它是否适合我用于JTextField的方法.下面是我的for循环：

       for (int index = 1; index <=9; index++)
            {
                JTextField field = new JTextField(3);
                field.setPreferredSize(new Dimension(150, 50));
                field.setHorizontalAlignment(JTextField.CENTER);
                field.setEditable(false);
                second.add(field);
                second.add(Box.createHorizontalStrut(10));
                second.add(Box.createVerticalStrut(10));

            }   

解决方法:

将文本字段存储在List中,以便稍后迭代它们.

public class ClassContainingTextFields {
    private final ArrayList<JTextField> textFields = new ArrayList<>();

    // ... inside the method that creates the fields ...
        for (int i = 0; i < 9; i++) {
            JTextField field = new JTextField(3);
            //  .. do other setup 
            textFields.add(field);
        }


    /**
     * This method returns true if and only if all the text fields are empty
     **/
    public boolean allFieldsEmpty() {
        for (JTextField textbox : textFields) {
            if (! textbox.getText().trim().isEmpty() ) {
                return false;   // one field is non-empty, so we can stop immediately
            }
        }
        return true;  // every field was empty (or else we'd have stopped earlier)
    }
    // ....
}

标签：java,is-empty,swing,jtextfield
来源： https://codeday.me/bug/20190725/1534306.html