how to access String... (varargs) to get specific characters and save them into String

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as it mentioned in the title, I have this code

  String a = flett("AM ","L","GEDS","ORATKRR","","R TRTE","IO","TGAUU");

public static String flett(String... s){
    StringBuilder merge = new StringBuilder();
    for (int i = 0; i < s.length; i++) {
        merge.append(s.charAt(i));
    }
    return merge;
}

I got an error at chartAt(i) ? how for example I can call every character in the array s and save them into merge or call an specific character like the first character from each one and save them into merge ?

You have to use a variable amount of String parameters, then concatenate all first characters of non empty Strings of the parameters and return the concatenated object:

public static void main(String[] args) {
    String s = flett("AM ","L","GEDS","ORATKRR","","R TRTE","IO","TGAUU", "HOLA", "MMMMH");
    System.out.println(s);
}

// Please note the parameter, it takes a various amount of Strings  
public static String flett(String ... values) {
    // create something that concatenates Strings (other options possible)
    StringBuilder sb = new StringBuilder();

    // the parameters are now an array of Strings, which you can "foreach"
    for (String s : values) {
        // check for empty ones and skip those
        if (!s.equals("")) {
            // append the first character of a valid parameter
            sb.append(s.charAt(0));
        }
    }

    return sb.toString();
}

Be surprised by the output…

Java Varargs: Use & Examples, Sometimes we don't know how many arguments we'll be sending a given method​. This lesson will cover the Java varargs concept and provide working In order to explain the concept of variable arguments, we don't have to look any further Since the variables/arguments are Strings, we need to specify this in the loop,  With string functions, you can create expressions in Access that manipulate text in a variety of ways. For example, you might want to display only part of a serial number on a form. Or, you might need to join (concatenate) several strings together, such as a last name and a first name.

s[i].charAt(j);

where i - the index of an array, j - the index of a letter within a String.

A Java 8 method that collects the first letter of each array's element might look like

public String flett(String... s) {
    return Arrays.stream(s)
                 .map(i -> i.length() > 0 ? String.valueOf(i.charAt(0)) : "")
                 .collect(Collectors.joining());
}

For the array "AM ","L","GEDS","ORATKRR","","R TRTE","IO","TGAUU", it results in "ALGORIT".

5.7. Creating Methods That Take Variable-Argument Fields, Creating Methods That Take Variable-Argument Fields Problem To make a Define a varargs field in your method declaration by adding a * character after the field type: def printAll ( strings : String* ) { strings . foreach ( println ) }. Given that method declaration, the printAll method can be called with zero or more parameters: The charAt() method returns the character at the specified index in a string. The index of the first character is 0, the second character is 1, and so on. Tip: The index of the last character in a string is string.length-1, the second last character is string.length-2, and so on (See "More Examples").

This method get some Strings and Create String from the first character of each String.

  public static String flett(String... s) {
        StringBuilder res = new StringBuilder(s.length);
        for (String a : s) {
            if (!a.isEmpty()) {
                res.append(a.charAt(0));
            }
        }
        return res.toString();
    }

Variable Length Arguments, In this case, you may want to have some kind of access from the target language. style input functions that accept a format string and a list of pointers into which Although it is possible to write functions that accept the special type va_list, this is %varargs(3, char *str = NULL) execlp; int execlp(const char *path, const  In this article we will discuss how to access characters in string by index. Accessing characters by index in string | indexof. In Python indexing of strings starts from 0 till n-1, where n is the size of string. So characters in string of size n, can be accessed from 0 to n-1. Suppose we have a string i.e.

Variable Length Arguments, In this case, you may want to have some kind of access from the target language. style input functions that accept a format string and a list of pointers into which return Although it is possible to write functions that accept the special type va_list, %varargs(10,char *arg = NULL) execlp; int execlp(const char *path, const  You can get the character at a particular index within a string by invoking the charAt() accessor method. The index of the first character is 0, while the index of the last character is length()-1. For example, the following code gets the character at index 9 in a string: String anotherPalindrome = "Niagara.

Proceedings of the 1992 ACM Conference on LISP and Functional , The C string type is char*, which is null terminated rather than counted. our Scheme to include the capability to read and write from in-memory strings (the (​Varargs does the right thing too: We could also have used print f instead of puts.) leads us to faithfully provide access to unsafe features of those same interfaces​. The InStrB function is used with byte data contained in a string. Instead of returning the character position of the first occurrence of one string within another, InStrB returns the byte position. Use the InStr function in an expression You can use InStr wherever you can use expressions.

String resources, Overview · Network access and syncing · Accessing the wearable Save data in a local database A string resource provides text strings for your application with When a string contains characters that have special usage in XML or private fun apply(content: Array<out CharSequence>, vararg tags:  The Microsoft Access Left function extracts a substring from a string, starting from the left-most character. The syntax for the Left function in MS Access is: Left ( text, number_of_characters ) Parameters or Arguments. The string that you wish to extract from. number_of_characters. Indicates the number of characters that you wish to extract

Comments
  • @StephenC String is different from String... I can't write s.chartAt(0)
  • The idea is that you first try something and then ask a question if you get stuck
  • Are you looking for characters in a String variable or an index of a String array?
  • also: implement error handling. what have you tried so far?
  • start with trying to write code that compiles. This code won't, since your method is missing a return statement
  • you didn't like my Java 8 approach, did you?