String str = null;
boolean bool = false;
try{
bool = str.equals("");
}catch(Exception e){
e.printStackTrace();
//bool = false;
} 怎么会?
java.lang.NullPointerException
boolean bool = false;
try{
bool = str.equals("");
}catch(Exception e){
e.printStackTrace();
//bool = false;
} 怎么会?
java.lang.NullPointerException
……
boolean bool = “123“.equals(str);