JAVA CERTIFICATION QUESTION: Sorting lists by multiple ...

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JAVA CERTIFICATION QUESTION: Sorting lists by multiple criteria

· java

Given:

public class Animal {  
  private String name;
  private int numOfLegs;
  private int numOfWings;  
  public Animal(String name, int numOfLegs, int numOfWings) {
    this.name = name;
    this.numOfLegs = numOfLegs;
    this.numOfWings = numOfWings;
  }  
  … // getters and setters  
  @Override
  public String toString() {
    return name;
  }
}

and this code fragment:

List<animal> listOfAnimal = List.of(
  new Animal("Spider", 8, 0),
  new Animal("Fly", 6, 2),
  new Animal("Dragonfly", 6, 4),      
  new Animal("Worm", 0, 0)
);
… // add sorting code here

𝐖𝐡𝐢𝐜𝐡 𝐜𝐨𝐝𝐞 𝐬𝐨𝐫𝐭𝐬 𝐚𝐧𝐢𝐦𝐚𝐥𝐬 𝐢𝐧 𝐭𝐡𝐞 𝐨𝐫𝐝𝐞𝐫: 𝐖𝐨𝐫𝐦, 𝐅𝐥𝐲, 𝐃𝐫𝐚𝐠𝐨𝐧𝐟𝐥𝐲, 𝐒𝐩𝐢𝐝𝐞𝐫?

𝐀. 

list.stream().sorted(Comparator.comparing(a -> a.getNumOfLegs()).thenComparing(a -> a.getNumOfWings())).collect(Collectors.toList());

𝐁. 

list.stream().sorted(Comparator.comparing(a -> a.getNumOfWings()).thenComparing(a -> a.getNumOfLegs())).collect(Collectors.toList());

𝐂. 

list.stream().sorted(Comparator.comparing(a -> a.getNumOfLegs())).sorted(Comparator.comparing(a -> a.getNumOfWings())).collect(Collectors.toList());

𝐃.

list.sort((la, ra) -> {

ˑif (la.getNumOfLegs() == ra.getNumOfLegs()) {

ˑˑreturn Integer.compare(la.getNumOfWings(),

ˑˑˑ ra.getNumOfWings());

ˑ} else {

ˑˑreturn Integer.compare(la.getNumOfLegs(),

ˑˑˑra.getNumOfLegs());|

ˑ}

});

𝐄. None of these answers

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