java关于String.split("|")的使用方式

public class TestSplit {
    public static void main(String[] a){
        String test = "中文|英文";
        print(test.split("|"));
        print(test.split(""));
        print(test.split("\\|"));
    }
    public static void print(String[] a){
        System.out.println("============================");
        for(String i:a){
            System.out.println(i);
        }
        System.out.println("============================\n");
    }
}

public String[] split(String regex) { ... }

String[] s1 = "a.b.c".split("\\.");
System.out.println(Arrays.asList(s1)); //[a, b, c]
String[] s2 = "a.b.c".split("[.]");
System.out.println(Arrays.asList(s2)); //[a, b, c]