Java方法，从ArrayList查找以给定字符串开头的名称变量

Question

I have made an ArrayList.txt which contains a list of students with their grades, a separate class student containing getName() , getGrade() , getMarks() etc and on my main class, I have a main method which will pull from this method

Hence my method goes as this:

public static String findName(ArrayList<Student> o, String name) {

    for(int i = 0; i < o.size(); i++)
    {
        if(o.get(i).getName().startsWith(name.toLowerCase()))
            System.out.print(o.get(i));
    }
    return name;
}

and my main method has this findName(students, "al");

my array.txt looks something like this

afafwafa
B
80
alicegg
C
70
lfhif
D
50
Allllleeee
A
94

however my findName() method is unable to pull all names that starts with "al" even though all my other methods are working. Also I need to take note that the method should be case insensitive and i need to use .startsWith() . Any suggestions?

To add on, with the given ArrayList of type student with a string file name, i need to create a method that will write the members of the arraylist to a text file with a given name with 1 element to a line using student class toString method format. i need to handle possible exceptions with try/catch. I also need to use either filereader, fileoutputsteam, printwriter, printstream in the code

public static void nameToFile(ArrayList<Student> a, String file) {      

    int i = inone.read();
    FileReader inone = new FileReader(a.get(i).toString());
    FileOutputStream fos = new FileOutputStream(file);
    PrintWriter outone = new PrintWriter(fos);

    outone.close();
 }      

my main method has this

nameToFile(students2,"modified.txt");

Answer 1

Also i need to take note that the method should be case insensitive and i need to use .startsWith().

If you want your startsWith() method to ignore the case, just convert both to lower or upper case before comparison:

if(o.get(i).getName().toLowerCase().startsWith(name.toLowerCase()))

If your findName() is supposed to just return 1 name, you can return it in the if-condition. If you want to return a list of names, add it to another arraylist, then return the arraylist.