MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

/*
 java.util.ArrayList: 
 java.util.ArrayList: Collection 
 java.util.ArrayList: int 
     
 */
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class MainClass extends JFrame {
    JList list = null;

    MainClass() {
        Container cp = getContentPane();
        cp.setLayout(new FlowLayout());
        ArrayList data = new ArrayList();
        data.add("Hi");
        data.add("Hello");
        data.add("Goodbye");
        list = new JList(data.toArray());
        list.addListSelectionListener(new ListSelectionListener() {
            public void valueChanged(ListSelectionEvent evt) {
                if (evt.getValueIsAdjusting())
                    return;
                System.out.println("Selected from " + evt.getFirstIndex() + " to " + evt.getLastIndex());
            }
        });
        cp.add(new JScrollPane(list), BorderLayout.CENTER);
    }

    public static void main(String[] s) {
        MainClass l = new MainClass();
        l.pack();
        l.setVisible(true);
    }
}