Java程序设计(第3版)第四章——错误:空指针异常
错误:空指针异常
如果以null调用对象的属性和方法，则运行报错,错误信息为:Exception in thread"main" java.long.Null Pointer Exception: Cannot read field “name"because”〈loca15〉"is null at impact.
例：
如果以null调用对象的属性和方法，则运行报错,错误信息为:Exception in thread"main" java.long.Null Pointer Exception: Cannot read field “name"because”〈loca15〉"is null at impact.
例：