Return arraylist 中的某些值

Question

尝试 return 仅 getUFFleet() 中的引用（IW1、SS2）但是它 returning [的每个值=17=]。方法 getUFFleet() 和 setupForces 来自同一个 class 而 toString 来自另一个 class FYI.

public String getUFFleet()
    {
        System.out.println(ForceDetails.toString());
        
        return "No forces in UFF";
      
    }

private void setupForces()
    {
        ForceDetails.add(new starShip("IW1","Twisters",200,200,10,0,0,"No","Wing" +"\n"));
        ForceDetails.add(new starShip("SS2","Enterprise",300,200,0,10,20,"No","Starship"));
  
    }

   public String toString()
    {
        String s;
        s = "\nForce reference: " + FleetRef + "\nName: " + FullName +
            "\nActivation Fee: " + ActivationFee +"\nStrikers: "
            + Strikers + "\nLaser Canons: " + LaserCanon + "\nPhotonTorpedoes: "
            + PhotonTorpedoes + "\nStregth: "+ BattleStrength
            +"\nCloaking: " + Cloaking + "\nForce Type: " + ForceType +"\n";
        return s;
    }

Answer 1

你可以尝试循环：

public String getUFFleet(){
    ForceDetails.forEach((starShip data) -> {
        System.out.println(data.getFleetRef());
      }
    );

    return "No forces in UFF";
}

有关 forEach 循环的额外信息请参阅以下 link： Foreach loop in java for a custom object list

Return arraylist 中的某些值

Return certain values from the arraylist

java

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