Listener.java

import edu.wpi.first.wpilibj.networktables.*;
import edu.wpi.first.wpilibj.tables.*;

public class Listener {
  private static class MyListener implements ITableListener {
    public void valueChanged(ITable source, String key, Object value, boolean isNew) {
      System.out.println("value changed: " + key + " isNew=" + isNew);
    }
  }
  public static void main(String[] args) {
    NetworkTable.setIPAddress("127.0.0.1");
    NetworkTable.setPort(10000);
    NetworkTable.setServerMode();
    NetworkTable nt = NetworkTable.getTable("");
    MyListener listener = new MyListener();
    nt.addTableListener(listener);
    //nt.addTableListenerEx(listener, nt.NOTIFY_NEW|nt.NOTIFY_UPDATE|nt.NOTIFY_LOCAL);
    try { Thread.sleep(1000); } catch (InterruptedException e) {}
    nt.putNumber("foo", 0.5);
    nt.setFlags("foo", NetworkTable.PERSISTENT);
    nt.putNumber("foo2", 0.5);
    nt.putNumber("foo2", 0.7);
    nt.putNumber("foo2", 0.6);
    nt.putNumber("foo2", 0.5);
    try { Thread.sleep(10000); } catch (InterruptedException e) {}
  }
}

ListenerClient.java

import edu.wpi.first.wpilibj.networktables.*;
import edu.wpi.first.wpilibj.tables.*;

public class ListenerClient {
  private static class MyListener implements ITableListener {
    public void valueChanged(ITable source, String key, Object value, boolean isNew) {
      System.out.println("value changed: " + key + " isNew=" + isNew);
    }
  }
  public static void main(String[] args) {
    NetworkTable.setIPAddress("127.0.0.1");
    NetworkTable.setPort(10000);
    NetworkTable.setClientMode();
    NetworkTable nt = NetworkTable.getTable("");
    MyListener listener = new MyListener();
    nt.addTableListener(listener);
    //nt.addTableListenerEx(listener, nt.NOTIFY_NEW|nt.NOTIFY_UPDATE|nt.NOTIFY_LOCAL);
    try { Thread.sleep(2000); } catch (InterruptedException e) {}
    try {
      System.out.println("Got foo: " + nt.getNumber("foo"));
    } catch(TableKeyNotDefinedException ex) {
    }
    nt.putBoolean("bar", false);
    nt.setFlags("bar", NetworkTable.PERSISTENT);
    nt.putBoolean("bar2", true);
    nt.putBoolean("bar2", false);
    nt.putBoolean("bar2", true);
    nt.putString("str", "hello world");
    double[] nums = new double[3];
    nums[0] = 0.5;
    nums[1] = 1.2;
    nums[2] = 3.0;
    nt.putNumberArray("numarray", nums);
    String[] strs = new String[2];
    strs[0] = "Hello";
    strs[1] = "World";
    nt.putStringArray("strarray", strs);
    try { Thread.sleep(10000); } catch (InterruptedException e) {}
  }
}