Java 具有多个带有滚动窗格的面板

我创建了两个面板和一个主面板。每个面板都包含一个非常大的图像，我希望它们都能够滚动查看图像的其余部分。但是当我在主面板中添加两个面板并运行它时，第一个面板非常大，它覆盖了第二个面板。如何为这两个面板实现ScrollPane

每个面板包含一个非常大的图像>

您可能希望使用GridLayout，以便每个滚动窗格占据一半的框架，以便尽可能多地显示每个图像

//JScrollPane scrollPane = new JScrollPane();
JScrollPane scrollPane2 = new JScrollPane(jPanelNorth);

使用滚动窗格最简单的方法是创建一个滚动窗格，其中显示您想要显示的组件，滚动窗格将为您将组件添加到视口中

  //mainPanel.add(jPanelNorth, BorderLayout.NORTH);
  mainPanel.add(scrollPane); // don't need the constraint when using GridLayout.

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然后将滚动窗格添加到主面板，因为滚动窗格包含带有图像的面板。

在这种情况下，使用网格布局似乎比使用边框布局要好得多：

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

public class BoardFrame extends JFrame {
//1. use GridLayout with 2 rows and 1 column .
JPanel mainPanel = new JPanel(new GridLayout(2,1));

JLabel jLabel = new JLabel();
JPanel jPanelNorth = new JPanel();
JScrollPane scrollPane = new JScrollPane();

JLabel jLabel2 = new JLabel();
JPanel jPanelSouth = new JPanel();
JScrollPane scrollPane2 = new JScrollPane();

public BoardFrame() {
  jLabel.setIcon(new ImageIcon("an image here"));
  jPanelNorth.add(jLabel);

  jLabel2.setIcon(new ImageIcon("an image here"));
  jPanelSouth.add(jLabel2);


  //2.you should place .setViewportView() here :
  scrollPane.setViewportView(jPanelNorth);
  scrollPane2.setViewportView(jPanelSouth);


  mainPanel.add(scrollPane);//is in the top ("North")
  mainPanel.add(scrollPane2);//next ("South")

  //3.use setContentPane instead of add() 
  setContentPane(mainPanel);




}
}

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非常感谢你。这正是我想做的！理解和正确的观点！再次感谢：）！！

  //mainPanel.add(jPanelNorth, BorderLayout.NORTH);
  mainPanel.add(scrollPane); // don't need the constraint when using GridLayout.

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

public class BoardFrame extends JFrame {
//1. use GridLayout with 2 rows and 1 column .
JPanel mainPanel = new JPanel(new GridLayout(2,1));

JLabel jLabel = new JLabel();
JPanel jPanelNorth = new JPanel();
JScrollPane scrollPane = new JScrollPane();

JLabel jLabel2 = new JLabel();
JPanel jPanelSouth = new JPanel();
JScrollPane scrollPane2 = new JScrollPane();

public BoardFrame() {
  jLabel.setIcon(new ImageIcon("an image here"));
  jPanelNorth.add(jLabel);

  jLabel2.setIcon(new ImageIcon("an image here"));
  jPanelSouth.add(jLabel2);


  //2.you should place .setViewportView() here :
  scrollPane.setViewportView(jPanelNorth);
  scrollPane2.setViewportView(jPanelSouth);


  mainPanel.add(scrollPane);//is in the top ("North")
  mainPanel.add(scrollPane2);//next ("South")

  //3.use setContentPane instead of add() 
  setContentPane(mainPanel);




}
}