三、String

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
import java.util.List;
import java.util.Set;

public class Hello {

public static void main(String[] args) {
    String str = "vint23ner";
    String cc = "vintner";
    int i = str.codePointAt(1);
    System.out.println(i);
    System.out.println(str.equals(cc));

    String val = "";
    String vals = "adf";
    System.out.println(val.isEmpty());

    System.out.println(vals.isEmpty());

    System.out.println(val.length());
    System.out.println(vals.length());

    

    String[] arr = str.split("\\d*n");
    List<String> list = Arrays.asList(arr);
    System.out.println(list);

    for(String key: list) {
        System.out.println(key);
    }
   
}

}