尝试使用一个组合盒保存joptionpane，并在字符串中产生一个字符串，但它使我无法转换为字符串”。

Question

这是给我错误的代码：

private void btnLLamada1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
    minutos = Integer.parseInt(JOptionPane.showInputDialog(null, "numero de minutos"));
    String[] lista = {"Local", "Internacional", "Celular"};
    JComboBox optionList = new JComboBox(lista);
    optionList.setSelectedIndex(0);
    tp = JOptionPane.showMessageDialog(null, optionList, "Que tipo de llamada va a usar",
            JOptionPane.QUESTION_MESSAGE);
}                                    

Answer 1

joptionpane.showmessagedialog（...）不会返回任何内容，因此它返回void。没有什么（void）不能转换为字符串。您要使用方法showInputDialog。为了灵感，请查看（docs.oracle.com/javase.com/javase/tutorial /uiswing/组件/…

。

import java.awt.*;
import javax.swing.*;

public class Test {

    void initGui() {
        int minutos = Integer.parseInt(JOptionPane.showInputDialog(null, "Numero de minutos"));
        System.out.println("Numero de minutos: " + minutos);
        
        String[] lista = { "Local", "Internacional", "Celular" };
        JComboBox<String> optionList = new JComboBox<String>(lista);
        optionList.setSelectedIndex(0);
        String tipo = JOptionPane.showInputDialog(null, optionList, "Que tipo de llamada va a usar", JOptionPane.QUESTION_MESSAGE);
        System.out.println("tipo de llamada: " + tipo);
    }
    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new Test().initGui();
            }
        });
    }
}