class 类型是如何得到的两种方式

qm.addJob("job1", "jobgroup1", "trigger1", "triggergroup1", ExecutiveJob.class,"0/10 * * * * ?");
qm.addJob("job1", "jobgroup1", "trigger1", "triggergroup1", Class.forName("com.sunrun.mpayrecon.schedule.ExecutiveJob"),"0/10 * * * * ?");