Question

您好我有这个简单的代码，可以在循环上生成按钮及其操作。默认循环为1 go，表示1个按钮。

我的目标是对“Adicionar”按钮进行编程以增加循环并使循环生成更多按钮。

这是代码：

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

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

@SuppressWarnings("serial")
public class GuiClass extends JFrame{
    // PUBLIC VARS
    // VARIAVEIS
    public int numeroButoes = 1;
    // CONSTRUCTOR
    public GuiClass(){
        super("Loop Buttons");
        setLayout(null);
        // BUTOES ADD & REMOVE
        JButton mais = new JButton("Adiciona");
        //JButton menos = new JButton("Remove");
        mais.addActionListener(new handlerBotaoAdd());
        mais.setBounds(50, 0, 100, 40);
        add(mais);
        // LOOP BOTOES
        for (int x = 0; x < numeroButoes; x++ ){
            JButton teste = new JButton("Botão " + x);
            teste.setActionCommand("Botão " +x);
            teste.addActionListener(new handlerBotoesLoop(teste.getActionCommand()));
            teste.setBounds(450, (x == 0 ? 0: x+(40*x)), 100, 40);
            add(teste);
        }
    }
    private class handlerBotoesLoop implements ActionListener{
        String texto;
        public handlerBotoesLoop(String x){
            x = texto;
        }
        public void actionPerformed(ActionEvent event){
            JOptionPane.showMessageDialog(null, String.format("%s", event.getActionCommand()));
        }
    }
    private class handlerBotaoAdd implements ActionListener{
        public void actionPerformed(ActionEvent event){
            numeroButoes++;
        }
    }
}

Answer 1

您可以使用方法将逻辑设置为创建按钮，并通过按钮的点击事件调用该按钮

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

@SuppressWarnings("serial")
public class Abc extends JFrame{
    // PUBLIC VARS
    // VARIAVEIS
    public int numeroButoes = 1;
    // CONSTRUCTOR
    public Abc(){
        super("Loop Buttons");
        setLayout(null);
        // BUTOES ADD & REMOVE
        JButton mais = new JButton("Adiciona");
        mais.addActionListener(new handlerBotaoAdd());
        //JButton menos = new JButton("Remove");
        mais.addActionListener(new handlerBotaoAdd());
        mais.setBounds(50, 0, 100, 40);
        add(mais);


    }

    // Method for button creating
    private void generateButtons(){
        for (int x = 0; x < numeroButoes; x++ ){
            JButton teste = new JButton("Botão " + x);
            teste.setActionCommand("Botão " +x);
            teste.addActionListener(new handlerBotoesLoop(teste.getActionCommand()));
            teste.setBounds(450, (x == 0 ? 0: x+(40*x)), 100, 40);
            add(teste);
        }
    }

    private class handlerBotoesLoop implements ActionListener{
        String texto;
        public handlerBotoesLoop(String x){
            x = texto;
        }
        @Override
        public void actionPerformed(ActionEvent event){
            JOptionPane.showMessageDialog(null, String.format("%s", event.getActionCommand()));
        }
    }
    private class handlerBotaoAdd implements ActionListener{
        @Override
        public void actionPerformed(ActionEvent event){
            numeroButoes++;
            generateButtons();
        }
    }
}

当您单击Adicionar按钮时，我无法理解您是要创建单个按钮还是多个按钮。在我的解决方案中，每次单击Adicionar按钮都会创建多个按钮。

如何强制再次调用for循环？

1 个答案: