java - JTextField 输出

Question

如何在 JTextField 中输出数字？我需要在输入时添加年龄并将其显示给他。

    age = new JTextField();
    age.setBounds(10, 133, 108, 20);
    contentPane.add(age);
    age.setColumns(10);

    textArea = new JTextField();
    textArea.setBounds(10, 198, 298, 20);
    contentPane.add(textArea);

    JButton btnDisplayWelcome = new JButton("Submit");
    btnDisplayWelcome.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {

            String first = firstname.getText();
            String last = lastname.getText();

            textArea.setText("Welcome " + first + ", " + last + " of ");
        }
    });

Answer 1

How do you output a number in the JTextField?

setText 方法允许您修改它的内容。

age.setText(String.valueOf(950));

参见 JTextComponent.setText(String)了解详情。