How to add and modify prefix in Java, using String arrays?-CodePudding

The essence of the problem is: Implement a public static addPrefix() method that takes an array of strings and a string prefix as input and returns a new array in which the given prefix is added to each element of the original array. A space is automatically added after the prefix.

How the program should work:

String[] names = {"John", "Smit", "Karl"};
var namesWithPrefix = App.addPrefix(names, "Mr.");

System.out.println(Arrays.toString(namesWithPrefix));
// => ["Mr. John", "Mr. Smit", "Mr. Karl"]

System.out.println(Arrays.toString(names)); //  The original array does not change

// => ["John", "Smit", "Karl"]

Here is my code:

public class App {
   
    public static String[] addPrefix(String[] names, String[] prefixes){
       
       String[] result= new String[names.length];
       String sequence =""  names[0] prefixes[0];
       result[0]="["  sequence "]";

       for(int i=1; i<names.length;i  ){
           sequence =", " names[i];
           result[i] ="["   sequence  "]";
       }
       return result;
    }
    
}

CodePudding user response：

This is how I'd do it based on the requirements.

Create the result array, loop through the original names by index and assign the prefix space current original name to the corresponding result array slot.

public static String[] addPrefix(String[] names, String prefix) {
    String[] result = new String[names.length];
    for (int i = 0; i < names.length; i  ) {
        result[i] = prefix   " "   names[i];
    }
    return result;
}