java thread

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;

import java.io.*;

public class PrintUDisk extends JSch implements TestInterface, Runnable {
 int size = 1000;
 PrintUDisk(){
 size=33;
 }
 public int getFreeSize() {
 return size;
 }

 public Session getSession() throws JSchException {
 Session s = super.getSession(USER,HOST,PORT);
 s.setConfig("StrictHostKeyChecking","no");
 s.setPassword(PASS);
 return s;
 }

 public String uptime() throws JSchException, IOException {
 Session s = this.getSession();
 s.connect(3000);
 Channel c = s.openChannel("shell");
 PipedInputStream pipIn = new PipedInputStream();
 PipedOutputStream pipOut = new PipedOutputStream(pipIn);
 FileOutputStream fileOut = new FileOutputStream( file, true);

 c.setInputStream(pipIn);
 c.setOutputStream(fileOut);

// c.setInputStream(System.in);
// c.setInputStream(new FilterInputStream(System.in) {
// public int read(byte[] b, int off, int len) throws IOException {
// return in.read(b, off, (len > 1024 ? 1024 : len));
// }
// });
 c.connect();
 pipOut.write("sudo su\n".getBytes());
 pipOut.write("uptime\n".getBytes());
 pipOut.write("exit\n".getBytes());
 c.disconnect();
 s.disconnect();
 return "done";
 }

 @Override
 public void name() {

 }

 @Override
 public void type() {

 }

 @Override
 public void run() {
 while (size>0) {
 System.out.println(Thread.currentThread().getName() + ": " + size);
try {
Process exec = Runtime.getRuntime().exec("ping www.163.com");
InputStream ret = exec.getInputStream();
System.out.println(new String(ret.readAllBytes(),"GB2312")); 
size--;
 } catch (IOException e) { e.printStackTrace();}
 }
}

import com.jcraft.jsch.JSch;
import java.util.ArrayList;

public class TestObject {
    JSch jsch;
    public static void main(String[] args) {
        String s[] = {"a","z"};
        System.out.println(s[1]);
        PrintUDisk pu = new PrintUDisk();
        Thread th = new Thread(pu,"th");
        Thread th1 = new Thread(pu,"th1");
        th.start();
        th1.start();
    }
}