Exam hints - Classes

public String toString() {         // returns information about the object Item, getting data from this same Class Item
        return "Item:" +
                "%n * Strength: " + strength +
                "%n * Agility: " + agility +
                "%n * Intelligence: " + intelligence;
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@Override                       // returns information about the object Hero, getting data from both Class Hero and Class Item
    public String toString() {
        return "Hero: " + name + " - " + level + "\n" + item.toString(); }
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public class HeroRepository {
 private Map<String, Hero> data;
    public HeroRepository() {
        this.data = new HashMap<>();  }

    public void add(Hero hero) {
        this.data.put(hero.getName(), hero); }

    public void remove(String name) {
        this.data.remove(name); }

    public int getCount() {
        return this.data.size(); }

    public Hero getHeroWithHighestStrength() {
        return this.data.values()
                .stream()
                .sorted((f, s) -> s.getItem().getStrength() - f.getItem().getStrength())
                .collect(Collectors.toList())
                .get(0);
    }

 @Override
    public String toString() {          // returns information about all Heroes in the Map
        return String.join("\n",
            this.data.values()
                .stream()
                .map(Hero::toString)
                .collect(Collectors.toList()));
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SECOND TASK:
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private List<Astronaut> data;
public void add(Astronaut astronaut) {                 // add method with curtain condition
       if (data.size() < capacity) {
            data.add(astronaut);
        }
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public Astronaut getOldestAstronaut() {                   // gets the biggest value in a List of objects
        return data.stream().max((f, s) -> Integer.compare(f.getAge(), s.getAge())).get();
    }
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public Astronaut getAstronaut(String name) {               // returns a certain object
        Astronaut givenName = null;
        for (Astronaut astronaut : this.data) {
            if (astronaut.getName().equals(name)) {
                givenName = astronaut;
            }
        }
        return givenName;
    }
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public String report() {                             // returns a String
       StringBuilder sb = new StringBuilder();
        sb.append("Astronauts working at Space Station ").append(name).append(":");
        for(Astronaut a: data){
            sb.append(System.lineSeparator()).append(a.toString());
        }
        return sb.toString().trim();
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THIRD TASK:
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public class Gladiator {
private Stat stat;

public int getStatPower(){                         // returns info getting data from other Class - Stat.
     return this.stat.getAgility()+this.stat.getFlexibility()
     +this.stat.getIntelligence()+this.stat.getSkills()+this.stat.getStrength();
    }
}
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 public Gladiator getGladiatorWithHighestStatPower(){
        Gladiator toReturn = new Gladiator("",new Stat(0,0,0,0,0),new Weapon(0,0,0));
        for (Gladiator g: this.gladiators.values()){
            if(g.getStatPower()>toReturn.getStatPower()){
                toReturn = g;
            }
        }
        return toReturn;
    }