java作用域public ,private ,protected ,friendly 的施用

java作用域public ,private ,protected ,friendly 的使用
作用域         当前类  同一package  子孙类  其他package

public             √                  √                 √               √

protected       √                  √                 √               ×

friendly           √                  √                 ×               ×

private            √                  ×                 ×               ×

    注:不写时默认为friendly