How to combine a String of arrays to one string using loops?

Question

I would like to combine all the Strings in an array to one String just by loops. How do I do it?

public class HelloWorld {

    public static void main(String[] args) {

        String [] x = {"ab", "bc", "cd"};

        String z = concatination(x, 3);

        System.out.println(z);
    }

    public static String concatination(String [] array, int i ){

        for(int j = 0; j<array.length-1; j++){
            return (array[j]);
        }
        return " ";
    }
}

output: 
java unreachable statement

Expected output:
abbccd

Thank you

score 0 · Answer 1 · answered Jul 09 '20 at 18:15

0

public static void main(String[] args) {

    String [] x = {"ab", "bc", "cd"};

    String z = concatination(x);

    System.out.println(z);
}

public static String concatination(String[] array) {
    String concat = "";
    for(int j = 0; j<array.length; j++) {
        concat += array[j];
    }
    return concat;
}

OUTPUT: abbccd

answered Jul 09 '20 at 18:15

Ridwan

214
4
17

A good answer should explain the problem. What's obvious to you might not be so for others. – 001 Jul 09 '20 at 18:18
@JohnnyMopp, ok thanks for the feedback. I'm still new here. – Ridwan Jul 09 '20 at 18:20
@Ridwan Thank you! How do you do the same with characters though? – Pri ya Jul 09 '20 at 18:29
@Priya, its going to be the same. – Ridwan Jul 09 '20 at 18:31

score 0 · Answer 2 · answered Jul 09 '20 at 18:20

0

Please try code below:-

public class HelloWorld{

     public static void main(String []args){
        String [] x = {"ab", "bc", "cd"};
        
        String z = concatination(x, 3);

        //With loop
        System.out.println(z);
        //Without loop
        System.out.println(String.join("",x));
     }

    public static String concatination(String [] array, int i ){
        StringBuilder builder = new StringBuilder();
        for(int j = 0; j<array.length; j++){
            builder.append(array[j]);
        }
        return builder.toString();
    }
}

answered Jul 09 '20 at 18:20

codeanalyse

47
2

`String z = concatination(x, 3);` Why passing `3` as parameter when you are not going to use it. – Ridwan Jul 09 '20 at 18:29
No need to pass 3. Just copied given code :-) – codeanalyse Jul 09 '20 at 19:27

How to combine a String of arrays to one string using loops?

2 Answers2