如果 table 在 JPanel 中，如何将它向左移动？

Question

我正在尝试将 table 移动到 JPanel 的左侧，后者也在 Window

内

我得到的是：

我要的是这个：

我尝试使用 .setBounds 方法，但它不起作用。有人知道怎么办吗？

这是我的代码：

package Modulos;
import paneles.*;
import javax.swing.*;

public class ModuloAdmin extends JFrame {

    public ModuloAdmin(){
        //Crear tabla
        String[][] datosprueba = {
                {"001","Carlitos", "Casa","51202011"},
                {"001","Carlitos", "Casa","51202011"}
        };

        String[] TituloColumna = {"Código", "Nombre", "Dirección", "Teléfono"};
        JTable TablaSucursales = new JTable(datosprueba,TituloColumna);

        //Contenido de las pestañas
        JPanel PanelSucursales = new JPanel();

        PanelSucursales.add(TablaSucursales);
        PanelSucursales.add(new JScrollPane(TablaSucursales));
        JPanel PanelProductos = new JPanel();
        PanelProductos.add(new JLabel("Panel productos"));
        JPanel PanelClientes = new JPanel();
        PanelClientes.add(new JLabel("Panel Clientes"));
        JPanel PanelVendedores = new JPanel();
        PanelVendedores.add(new JLabel("Panel Vendedores"));

        //CREACION DE PESTAÑAS
        JTabbedPane Pestanias = new JTabbedPane();
        Pestanias.setBounds(20,80,700,700);
        Pestanias.add("Sucursales",PanelSucursales);
        Pestanias.add("Productos",PanelProductos);
        Pestanias.add("Clientes", PanelClientes);
        Pestanias.add("Vendedores",PanelVendedores);

        //vENTANA MODULO DE ADMIN
        JFrame VentanaModuloAdmin = new JFrame();
        VentanaModuloAdmin.add(Pestanias);
        VentanaModuloAdmin.setLayout(null);
        VentanaModuloAdmin.setSize(800,850);
        VentanaModuloAdmin.setLocationRelativeTo(null);
        VentanaModuloAdmin.setTitle("Módulo de administrador");
        VentanaModuloAdmin.setVisible(true);
        VentanaModuloAdmin.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

Answer 1

使用appropriate layout mangers和容器管理

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.border.EmptyBorder;

public class Test {

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

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private JTable table;

        public TestPane() {
            setBorder(new EmptyBorder(16, 16, 16, 16));
            setLayout(new GridLayout(0, 2));
            add(new JScrollPane(table));
            add(createButtonPane());
        }

        protected JPanel createButtonPane() {
            JPanel panel = new JPanel(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.ipadx = 16;
            gbc.ipady = 16;
            gbc.fill = gbc.HORIZONTAL;
            gbc.gridx = 0;
            gbc.gridy = 0;

            panel.add(new JButton("Clear"), gbc);
            gbc.gridx = 1;
            panel.add(new JButton("Carga Masiva"), gbc);

            gbc.gridy++;
            gbc.gridx = 0;
            panel.add(new JButton("Actualizar"), gbc);
            gbc.gridx = 1;
            panel.add(new JButton("Eliminar"), gbc);

            gbc.gridy++;
            gbc.gridx = 0;
            gbc.gridwidth = 2;
            gbc.anchor = GridBagConstraints.NORTH;
            gbc.weighty = 1;
            panel.add(new JButton("Exportar Listado a PDF"), gbc);

            return panel;
        }


    }

}

说真的，布局管理器解决了 UI 开发人员面临的最困难的问题之一 - 输出的可变性质（屏幕分辨率、字体指标、可访问性修饰符，一大堆不同的东西会改变布局的方式需要计算）。

它们可能看起来很难上手，但一旦您习惯使用它们并学习如何使用上面演示的“复合布局”，它将帮助您做出更好的 UIs更快

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