一个null字符串(String s = null
)和一个空字符串(String s = ""
)之间有什么区别?
这是我的回答:
String s1 = ""; //print statement does not print any thing for s1 but s1.length()=0
String s2 = null;//print statement prints "null" for s2 but s2.length() gives exception
它是什么意思?