toString example

A.java

import java.util.*;

public class A {
  String name;

  public A(String name) { this.name = name; }

  public String toString(){ return "A[" + this.name + "]"; }

  public static void main ( String [] args ) {

    List<A> as = new ArrayList<>();

    as.add( new A("huguinho"));
    as.add( new A("zezinho"));
    as.add( new A("luizinho"));

    for( A a : as ){
      System.out.println(a);
    }
  }
}