怎样在java代码中调用执行shell脚本

 // 用法：Runtime.getRuntime().exec("命令");

    String shpath="/test/test.sh";   //程序路径
    Process process =null;
    String command1 = “chmod 777 ” + shpath;
    try {
      Runtime.getRuntime().exec(command1 ).waitFor();
    } catch (IOException e1) {
        e1.printStackTrace();
    }catch (InterruptedException e) {
         e.printStackTrace();
    }

    String var="201102";  /参数