Set visible row count and fixed cell height and width

 
import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;

public class SizingSamples {
  public static void main(String args[]) {
        String labels[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J" };

    JFrame frame = new JFrame("Sizing Samples");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container contentPane = frame.getContentPane();

    JList jlist1 = new JList(labels);
    jlist1.setVisibleRowCount(4);
    DefaultListModel model = new DefaultListModel();
    model.ensureCapacity(1000);
    for (int i = 0; i < 100; i++) {
      for (int j = 0; j < 10; j++) {
        model.addElement(labels[j]);
      }
    }
    JScrollPane scrollPane1 = new JScrollPane(jlist1);
    contentPane.add(scrollPane1, BorderLayout.NORTH);

    JList jlist2 = new JList(model);
    jlist2.setVisibleRowCount(4);
    jlist2.setFixedCellHeight(12);
    jlist2.setFixedCellWidth(200);
    JScrollPane scrollPane2 = new JScrollPane(jlist2);
    contentPane.add(scrollPane2, BorderLayout.CENTER);

    JList jlist3 = new JList(labels);
    jlist3.setVisibleRowCount(4);
    contentPane.add(jlist3, BorderLayout.SOUTH);

    frame.setSize(300, 350);
    frame.setVisible(true);
  }
}

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Set visible row count and fixed cell height and width : List « Swing JFC « Java

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