Java 使用不同布局嵌套JPanel

我目前正试图为自己的工作做一个小项目，以帮助我完成日常琐事。我试图在Swing中创建一个小表，并开始添加组件。然而，我面临着一些困难

首先，让我强调一下我需要实现的目标。下图：

根据下面的代码示例，我尝试创建一个主容器，我将其大小设置为600 x 300，然后创建了3个JPanel（左、右和上面板以包含其他两个）

我已经将GridLayout设置为UpperBothJPanel，使其具有相同大小的表，并将GridBagLayout设置为两个（左侧和右侧JPanel），以便可以分别修改其宽度。 然后我在左侧添加了3个jlabel，在右侧添加了3个jlabel。 然后将右侧和左侧JPanel添加到上面板

然而，我遇到了一些困难：

如果我更改主容器的大小，从600x300改为600x300，它似乎不再工作。我不明白如果不是主容器，我现在应该将尺寸更改给谁

如果我将上面板大小设置为150x200，它将不起作用。它继续占据主容器的所有空间

左侧和右侧JLabel偏移且未完全对齐，尽管左侧和右侧JLabel的代码相同

导入java.awt.Color； 导入java.awt.Container； 导入java.awt.Dimension； 导入java.awt.GridBagConstraints； 导入java.awt.GridBagLayout； 导入java.awt.GridLayout； 导入java.awt.Toolkit； 导入javax.swing.JFrame； 导入javax.swing.JLabel； 导入javax.swing.JPanel

公共类主框架{

public String frameTitle, projectNameString, countryNameString, projectDetailString, requestDateString;
private int offerRevisionVal;

public JFrame frame;
public Container mainContainer;
private Toolkit toolkit;
private JPanel upperBothPanels, upperLeftPanel, upperRightPanel, middlePanel, lowerPanel; // Main Panels where I added my smaller Objects
private GridBagLayout upperLeftGridLayout, upperRightGridLayout;
private GridLayout upperBothGridLayout;


// UPPER OBJECTS
private JLabel projectLabel, countryLabel, projectDetailLabel, offerLabel, requestDateLabel, emptyLabel;


public Main(){

    frameTitle = "CRANES QUOTATIONS";

    // MAIN INSTANCE VARIABLES DEFINITION
    projectNameString = "Project Title"; // TO ADD LATER 
    countryNameString = "Brazil"; // TO ADD LATER
    projectDetailString = "32 Cranes biTravi"; // TO ADD LATER
    offerRevisionVal = 01; // TO ADD LATER
    requestDateString = "20-April-2017"; // tTO ADD LATER


    setTitle(frameTitle); // Added the main title of my App
    mainContainer = getContentPane(); // set up a Container to contain all my objects
    mainContainer.setBackground(Color.GREEN); // set the color of my ContentPane

    // UPER PANEL DEFINITION
    upperLeftPanel = new JPanel();
    //upperLeftPanel.setBorder(BorderFactory.createDashedBorder(Color.red, 5, 5));


    // Definition place of my upper Grid Bag Layouts. One to hold them all.
    upperBothGridLayout = new GridLayout(2,1);

        upperLeftGridLayout = new GridBagLayout();




    upperLeftPanel.setBackground(Color.GREEN);
    upperLeftPanel.setLayout(upperLeftGridLayout);


    // PLACE LEFT GRID
    GridBagConstraints c = new GridBagConstraints();    

        projectLabel = new JLabel(projectNameString);
        c.weighty = 0.5;
        c.fill = GridBagConstraints.BOTH;
        c.gridx=0;
        c.gridy=0;
        upperLeftPanel.add(projectLabel, c);

        countryLabel = new JLabel(countryNameString);
        c.weighty=0.5;
        c.fill = GridBagConstraints.BOTH;
        c.gridx=0;
        c.gridy=1;
        upperLeftPanel.add(countryLabel, c);

        projectDetailLabel = new JLabel(projectDetailString);
        c.weighty = 0.5;
        c.fill = GridBagConstraints.BOTH;
        c.gridx = 0;
        c.gridy = 2;
        upperLeftPanel.add(projectDetailLabel, c);

        // PLACE RIGHT GRID
        upperRightPanel = new JPanel();
        upperRightPanel.setBackground(Color.WHITE);
        upperRightGridLayout = new GridBagLayout();
        upperRightPanel.setLayout(upperRightGridLayout);
        //upperRightPanel.setBorder(BorderFactory.createDashedBorder(Color.BLUE, 5, 5));

        GridBagConstraints d = new GridBagConstraints();    

        offerLabel = new JLabel(String.valueOf(offerRevisionVal));
        d.weighty = 0.5;
        d.fill = GridBagConstraints.BOTH;
        d.gridx=0;
        d.gridy=0;
        upperRightPanel.add(offerLabel, d);

        requestDateLabel = new JLabel(requestDateString);
        d.weighty=0.5;
        d.fill = GridBagConstraints.BOTH;
        d.gridx=0;
        d.gridy=1;
        upperRightPanel.add(requestDateLabel, d);

        emptyLabel = new JLabel();
        d.weighty = 0.5;
        d.fill = GridBagConstraints.BOTH;
        d.gridx = 0;
        d.gridy = 2;
        upperRightPanel.add(emptyLabel, d);



        upperBothPanels = new JPanel(new GridLayout(1,2));
        upperBothPanels.setSize(150,200);
        upperBothPanels.add(upperLeftPanel);
        upperBothPanels.add(upperRightPanel);


    // ===========================================================================  ADD THE PANELS


    mainContainer.add(upperBothPanels);

    // =========================================================================== 
    setSize(600, 300); // set the height and width of my window
    centerToScreen ();
    setVisible(true); // set visibility 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // sets up what it does when I close the App.

}

// Method to center to screen
public void centerToScreen (){
    toolkit = getToolkit();
    Dimension size = toolkit.getScreenSize(); // gets the screen size
    setLocation(size.width / 2 - getWidth() / 2, size.height / 2 - getHeight() / 2); // sets the location
}

}

/////////////////////

import javax.swing.SwingUtilities;

public class CranesApp {

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable(){

            @Override
            public void run() {
                new Main();

            }

        });


    }

}

提前谢谢大家,，

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致以最诚挚的问候

如何创建和使用JTable？如果我添加了一个JTable以包含我的3行2列（如上所述），那么我是否可以在一个新JTable的下面添加10行4列，并按照之前的JTable设置所有最大大小？