一、split介绍
split() 方法根据匹配给定的正则表达式来拆分字符串。
注意：?.?、?$、?|?和?*?等转义字符，必须得加?\\。
注意：多个分隔符，可以用?|?作为连字符。
语法
public String[] split(String regex, int limit)
参数
-
regex?-- 正则表达式分隔符。
-
limit?-- 分割的份数。
返回值
字符串数组。
?二、测试一
如下示例，猜猜答案吧
private static void test01() {
String str1="a";
String str2="a,b";
String str3="a,b,";
String str4="a,b, ";
String str5=",,,,,,";
String[] split1 = str1.split(",");
String[] split2 = str2.split(",");
String[] split3 = str3.split(",");
String[] split4 = str4.split(",");
String[] split5 = str5.split(",");
System.out.println("str1分割后："+JSON.toJSONString(split1));
System.out.println("str2分割后："+JSON.toJSONString(split2));
System.out.println("str3分割后："+JSON.toJSONString(split3));
System.out.println("str4分割后："+JSON.toJSONString(split4));
System.out.println("str5分割后："+JSON.toJSONString(split5));
}结果
str1分割后：["a"]
str2分割后：["a","b"]
str3分割后：["a","b"]
str4分割后：["a","b"," "]
str5分割后：[]三、测试二
private static void test02() {
String str1="a";
String str2="a,b";
String str3="a,b,";
String str4="a,b, ";
String str5=",,,,,,";
String[] split1 = str1.split(",",2);
String[] split2 = str2.split(",",2);
String[] split3 = str3.split(",",2);
String[] split4 = str4.split(",",2);
String[] split5 = str5.split(",",2);
System.out.println("str1分割后："+JSON.toJSONString(split1));
System.out.println("str2分割后："+JSON.toJSONString(split2));
System.out.println("str3分割后："+JSON.toJSONString(split3));
System.out.println("str4分割后："+JSON.toJSONString(split4));
System.out.println("str5分割后："+JSON.toJSONString(split5));
}结果?
str1分割后：["a"]
str2分割后：["a","b"]
str3分割后：["a","b,"]
str4分割后：["a","b, "]
str5分割后：["",",,,,,"]
