#136233 CESGRANRIO - 2013 - Analista (BNDES)/Análise de Sistemas - Desenvolvimento

public class CL01 implements IF005 {
      private final Object op1(Object o){
          return new Object();
      }
      public String cat(String s1,String s2) {
          return s1+s2;
      }
}

public class CL02 implements IF005 {
      public final String op1(Object o) {
          return ʹʹʹʹ;
      }
      public String cat(String a,String b) {
          return ʹʹʹʹ;
      }
}

public class CL03 implements IF005 {
      public Object op1(String s) {
          return ʹʹʹʹ;
      }
      public String cat(String a,String b) {
          return ʹʹʹʹ;
      }
}

public class CL04 implements IF005 {
      protected String op1(Object s) {
          return ʹʹʹʹ;
      }
      public String cat(String a,String b) {
          return ʹʹʹʹ;
      }
}

public class CL05 implements IF005 {
      Object op1(Object o) {
           return ʹʹʹʹ;
      }
      String cat(String a,String b) {
          return ʹʹʹʹ;
      }
}