对象的初始化和清理也是两个非常重要的安全问题，一个对象或者变量没有初始时，对其使用后果是未知，同样的使用完一个变量，没有及时清理，也会造成一定的安全问题(Synthetic Aperture Radar (SAR) has proven itself to be a valuable tool for detection and monitoring of marine oil spills. Still, more research on the influence of sensor parameters such asfrequency, incidence angle and polarization on the oil spill detection ability are requested to enable more reliable oil spill detection services.)