EchoArgs

For each of the methods echo1, echo2, ..., echo4 shown below, add exactly one line of Java code immediately below the comment “// Your code here:” so that the method produces the same output that echo0 produces for a given input. Do not make any other changes to the code.

public class EchoArgs {

  public static void echo0(String[] strings) {
    String s;
    int n = strings.length;
    int i = -1;
    while (++i < n) {
      s = strings[i];
      System.out.print(s);
    }
  }
  
  public static void echo1(String[] strings) {
    String s = "";
    int n = strings.length;
    int i = 0;
    while (i < n) {
      // Your code here:
      s = strings[i];
      System.out.print(s);
      i++;
    }
  }
  
  public static void echo2(String[] strings) {
    String s = "";
    int n = strings.length;
    for (int i = 0; i < n; i++) {
      // Your code here:
      s += strings[i];
    }
    System.out.print(s);
  }
  
  public static void echo3(String[] strings) {
    String args = "";
    for (String s : strings) {
      // Your code here:
      args += s;
    }
    System.out.print(args);
  }
    
  public static void echo4(String[] strings) {
    String s = "";
    int n = strings.length;
    int i = 0;
    while (i++ < n) {
      // Your code here:
      s = strings[i-1];
      System.out.print(s);
    }
  }
  
  public static void main(String[] args) {
    echo0(args);
    echo1(args);
    echo2(args);
    echo3(args);
    echo4(args);
  }
}