كيف اعمل هذا في الجافا

تفضل

public class JavaApplication4 {

public static void main(String[] args) {

    String[] a = {"J","O","R","A","N"};
    String m = "";
    for (int b=0 ; b < a.length ; b++){

        m += a[b];
    System.out.println(m);

    }
}  

}