java - Accept only unique input from a user into an ArrayList -

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i @ loss of how allow user enter 3 unique numbers. have tried create array adds input , checks damage array make sure numbers unique, not seem work. thank help!! 

    arraylist<integer> damage = new arraylist<integer>();      arraylist<integer> unique = new arraylist<integer>();     (int k = 0; k<=10; k++)     {         unique.add(k);     }         {         system.out.print("attack or defend? (a or d) ");         option = keyboard.nextline().touppercase();         system.out.println();         switch (option)          {             case "a":                 system.out.println("enter 3 unique random numbers (1-10)");                 for(int = 0; i<3; i++)                 {                     system.out.print("number " + (i+1) + ": ");                     input = keyboard.nextint();                     if (input < 1 || input > 10)                     {                         system.out.println("error! enter valid number (1-10)");                     }                     else                      {                        if (unique.contains(input))                        {                            unique.remove(input);                              system.out.println(unique);                            damage.add(input);                            system.out.println(damage);                             i--;                        }                                                   else                         {                            unique.add(0, input);                            system.out.println("number not unique!");                        }                      }                  }                 system.out.println(damage);                 system.out.println();                 userdamage ahit = new userdamage(damage, option);                 name.getname();                 ahit.setuserdamage(damage, option);                 system.out.println("\n");                 cpuhealth-=ahit.getuserdamage();                 cpu.setcpudamage();                 userhealth-=cpu.getcpudamage();                 system.out.println("\n\nhealth left: " + userhealth);                 system.out.println("computer health left: " + cpuhealth + "\n");                 damage.clear();                 option = null;                 break;               default:                 system.out.println("invalid selection.");                 break;         }     }     while(userhealth>0 || cpuhealth >0);

use contains method java.util.list determine if item present. javadoc:

boolean contains(object o)

returns true if list contains specified element. more formally, returns true if , if list contains @ least 1 element e such (o==null ? e==null : o.equals(e)).


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