Example: program on strings

public class Hamburger {
  public static void main(String[] args) {
    String s,t,u,v,z;
    s = "ham";
    t = "burger";
    u = s.concat(t);
    v = u.substring(0,3);
    z = u.substring(3);
    System.out.println("s = ".concat(s));
    System.out.println("t = ".concat(t));
    System.out.println("u = ".concat(u));
    System.out.println("v = ".concat(v));
    System.out.println("z = ".concat(z));
  }
}