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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?（26个答案）
四个月前关门了。
我有一个问题，当我运行这个代码，我发现这个问题。如何解决它？

此代码

public class kpi {
      static String host = "";

      public static void main(String[] args) {
        host = args[0].toLowerCase();
        try {
          SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ");
          Date now = new Date();
          String strDate = sdfDate.format(now);
          JSch jsch = new JSch();
          Session session = jsch.getSession("hs", args[1], 22);
          session.setConfig("StrictHostKeyChecking", "no");
          session.setPassword("kti365LM");
          session.connect();
          System.out.println("session connected");
          Channel channel = session.openChannel("shell");
          OutputStream ops = channel.getOutputStream();
          PrintStream ps = new PrintStream(ops, true);
          channel.connect();
          System.out.println("channel connected");
          String prompt = "[local]" + args[0] + "#";
          System.out.println(exec(channel, ps, "epg node status", prompt));
          String nodeinfo = "";
          nodeinfo = exec(channel, ps, "pdc_kpi.pl", prompt);
          String[] linenode = nodeinfo.split("\\r?\\n");
          String key = "";
          JSONObject peerjson = new JSONObject();
          peerjson.put("time", strDate.replace(" ", "T"));
          peerjson.put("node", args[0]);
          for (int i = 6; i  0 && c  0) {`
                    Pattern p = Pattern.compile("(\\d+(?:\\.\\d+)?)");
                    Matcher m = p.matcher(fields[j]);
                    if (m.find()) {
                      System.out.println(key + ":" + m.group());
                      peerjson.put(key, Float.parseFloat(m.group().trim()));
                      c++;
                    } 
                  } 
                  key = key + fields[j];
                  c++;
                } 
                if (j > 4 && c == 0)
                  break; 
              } 
              key = "";
            } 
          } 
          insert(strDate, "nodekpimme", peerjson.toString());
          channel.disconnect();
          session.disconnect();
        } catch (Exception e) {
          e.printStackTrace();
        } 
      }

且该错误
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 at trcrt.kpi.main(kpi.java:24)