IT의 신

Which of the following lambda expressions can fill in the blank? (Choose all that apply) List list = new ArrayList(); list.removeIf( ); A) String s->s.isEmpty() B) s->{return s.isEmpty();} C) s->s.isEmpty() D) s->{s.isEmpty()} E) s->{s.isEmpty();} F) (String s)->s.isEmpty() removeIf() 는 Predicate를 받으며, 이것은 명시된 타입을 사용하는 하나의 파라미터의 파라미터 리스트를 가진다. D와 E는 return 키워드가 없어서 틀리다. 람다 바디 안쪽에 중괄호({})를 사용했으면 ..

interface Aquatic{ public default int getNumberOfGills(int input) { return 2; } } public class ClownFish implements Aquatic { public String getNumberOfGills() { return "4"; } public String getNumberOfGills(int input) { return "6"; } public static void main(String[] args) { System.out.println(new ClownFish().getNumberOfGills(-1)); } } What is the output of the following code? (Choose all that app..

Which of the following can replace line 4 to print "avaJ"? (Choose all that apply) StringBuilder puzzle=new StringBuilder("Java"); // INSERT CODE HERE System.out.println(puzzle); A) puzzle.reverse(); B) puzzle.append("vaJ$").delete(0,3).deleteCharAt(puzzle.length()); C) puzzle.append("vaJ$").substring(0,4); D) None of the above E) puzzle.append("vaJ$").delete(0,3).deleteCharAt(puzzle.length()-1)..

public class BirdSeed { private int numberBags; boolean call; public BirdSeed() { // LINE 1 call=false; // LINE 2 } public BirdSeed(int numberBags) { this.numberBags=numberBags; System.out.println("파리미터 생성자 호출됨"); } public static void main(String[] args) { BirdSeed seed = new BirdSeed(); System.out.println(seed.numberBags); } } Which code can be inserted to have the code print 2? A) Replace line..

Which of the following are true statements about the following code? (Choose all the apply) import java.util.ArrayList; import java.util.List; public class ListNull { public static void main(String[] args) { 4: List ages=new ArrayList(); 5: ages.add(Integer.parseInt("5")); 6: ages.add(Integer.valueOf("6")); 7: ages.add(7); 8: ages.add(null); 9: for(int age:ages) System.out.print(age); } } A) Exa..