import java.io.IOException;
import java.util.*;
import java.util.regex.Pattern;

public class Netstat
{
  public static class Protocoll
  {
    public String protocoll;
    public String localAddress;
    public String remoteAddress;
    public String status;

    public Protocoll( String protocoll, String localAddress, String remoteAddress, String status )
    {
      this.protocoll = protocoll;
      this.localAddress = localAddress;
      this.remoteAddress = remoteAddress;
      this.status = status;
    }

    @Override
    public String toString()
    {
      return String.format( "%-6s %-22s %-22s %s", protocoll, localAddress, remoteAddress, status );
    }
  }

  public static void main( String[] args ) throws IOException
  {
    for ( Protocoll p : netStat() )
      System.out.println( p );
  }

  public static Iterable<Protocoll> netStat() throws IOException
  {
    Collection<Protocoll> result = new ArrayList<>();
    ProcessBuilder builder = new ProcessBuilder( "netstat", "-n" );
    Process p = builder.start();
    try ( Scanner scanner = new Scanner( p.getInputStream() ) ) {
      Pattern pattern = Pattern.compile( "(TCP|UDP)\\s+(\\S+)\\s+(\\S+)\\s+(\\S+)" );
      while ( scanner.findWithinHorizon( pattern, 0 ) != null )
        result.add( new Protocoll( scanner.match().group( 1 ), scanner.match().group( 2 ), scanner.match().group( 3 ), scanner.match().group( 4 ) ) );
    }
    return result;
  }
}

This leads to something like

TCP    127.0.0.1:16709        127.0.0.1:49159        HERGESTELLT

TCP    127.0.0.1:19872        127.0.0.1:49176        HERGESTELLT

TCP    127.0.0.1:49159        127.0.0.1:16709        HERGESTELLT

TCP    127.0.0.1:49176        127.0.0.1:19872        HERGESTELLT

TCP    127.0.0.1:49189        127.0.0.1:49190        HERGESTELLT

TCP    127.0.0.1:49190        127.0.0.1:49189        HERGESTELLT

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