weka之初窥Instances类

都一个文件并显示

package instancesTest;import java.io.FileNotFoundException;import java.io.FileReader;import weka.core.Instances;public class InstancesTest {    public static Instances getFileInstances(String fileName) throws Exception    {        FileReader frData=new FileReader(fileName);        Instances data=new Instances(frData);        return data;    }    public static void main(String[] args) throws Exception     {        Instances instances=getFileInstances("E:\\Program Files\\Weka-3-8\\data\\weather.nominal.arff");        //把数据集全部输出//      System.err.println(instances.toString());        //使用numINstances()获得样本数量        for (int i = 0; i < instances.numInstances(); i++)         {            //循环输出第i个样本            System.err.println(instances.instance(i));        }    }}