Java "split(regEx)" 和 "split(regEx, 0)" 的区别？

Question

使用split(regEx)和split(regEx, 0)有什么区别吗？

因为输出是针对我测试过的情况。例如：

String myS = this is stack overflow;
String[] mySA = myS.split(' ');

结果 mySA === {'this','is','stack,'overflow'}

和

String myS = this is stack overflow;
String[] mySA = myS.split(' ', 0);

也会导致 mySA === {'this','is','stack,'overflow'}

"hidden"这里有什么事吗？或者关于 .split(regEx, 0)?

需要了解的其他信息

Answer 1

它们本质上是一样的。

引自 String.split(String regex) 文档：

This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.

Answer 2

回答问题。是的，它们是一样的。

请找到实习生调用split(regex,0)方法的Stringclass的split方法。

public String[] split(String regex) {
    return split(regex, 0);
}

The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded

例如下面的代码可以给你一些启发。

String myS = "this is stack overflow";
String[] mySA = myS.split(" ", 2);
String[] withOutLimit = myS.split(" "); 
System.out.println(mySA.length); // prints 2
System.out.println(withOutLimit.length); // prints 4

Java "split(regEx)" 和 "split(regEx, 0)" 的区别？

Java difference between "split(regEx)" and "split(regEx, 0)"?

java

split