java新建bat文件并执行bat文件

public void DeleteIndex(String id) {  
             try {  
                  FileWriter fw = new FileWriter("C:\\exampledocs\\delete.bat");  
                    fw.write("cd C:\\exampledocs");  
                    fw.write("\r\n");  
                    fw.write("c:");  
                    fw.write("\r\n");  
                    fw.write("java -Ddata=args -Durl=http://localhost:8080/solr/update -jar post.jar "  + "\"<delete><query><id>" +id+ "</id></query></delete>\"");  
                    fw.write("\r\n");  
                    fw.write("del delete.bat");  
                    fw.write("\r\n");  
                    fw.write("exit");  
                    fw.close();  
                   Process process = Runtime.getRuntime().exec("cmd.exe /C start C:\\exampledocs\\delete.bat");  
                    BufferedReader read = new BufferedReader(new InputStreamReader(process.getInputStream()));     
                    String str = null;     
                    while ((str = read.readLine()) != null) {     
                        System.out.println(str);     
                    }     
                }  
                catch (Exception e1) {  
                       e1.printStackTrace();  
                }  
        }  
 
 
当运行的时候  
 
D:\workspace\SolrJ>cd C:\exampledocs  
 
D:\workspace\SolrJ>c:  
 
C:\exampledocs>java -Ddata=args -Durl=http://localhost:8080/solr/update -jar pos  
SimplePostTool: version 1.2 
SimplePostTool: WARNING: Make sure your XML documents are encoded in UTF-8, othe  
SimplePostTool: POSTing args to http://localhost:8080/solr/update..  
SimplePostTool: COMMITting Solr index changes..  
 
C:\exampledocs>del delete.bat  
找不到批处理文件。  
 
C:\exampledocs>  
 
文件其实也删除了 不过给我报了这个错 下面的exit都没有执行，结果框框还在   
谁能告诉我 为什么啊  
 
我不把del delete.bat写在代码中   
当执行到  
D:\workspace\SolrJ>cd C:\exampledocs  
 
D:\workspace\SolrJ>c:  
 
C:\exampledocs>java -Ddata=args -Durl=http://localhost:8080/solr/update -jar pos  
SimplePostTool: version 1.2 
SimplePostTool: WARNING: Make sure your XML documents are encoded in UTF-8, othe  
SimplePostTool: POSTing args to http://localhost:8080/solr/update..  
SimplePostTool: COMMITting Solr index changes..  
 
C:\exampledocs>  
 
这的时候   
我手动的去写 del delete.bat就可以直接执行 为什么