Which code can be inserted to have the code print 2?
public class BirdSeed { private int numberBags; boolean call; public BirdSeed() { // LINE 1 call = false; // LINE 2 } public BirdSeed(int numberBags) { this.numberBags = numberBags; } public static void main(String[] args) { BirdSeed seed = new BirdSeed(); System.out.println(seed.numberBags); } }
❌ A. Replace line 1 with BirdSeed(2); ❌ B. Replace line 2 with BirdSeed(2); ❌ C. Replace line 1 with new BirdSeed(2); ❌ D. Replace line 2 with new BirdSeed(2); ✅ E. Replace line 1 with this(2); ❌ F. Replace line 2 with this(2);
Explanation: Options A and B will not compile because constructors cannot be called without new. Options C and D will compile but will create a new object rather than setting the fields in this one. Option F will not compile because this() must be the first line of a constructor. Option E is correct.
Which code can be inserted to have the code print 2?
public class BirdSeed { private int numberBags; boolean call; public BirdSeed() { // LINE 1 call = false; // LINE 2 } public BirdSeed(int numberBags) { this.numberBags = numberBags; } public static void main(String[] args) { BirdSeed seed = new BirdSeed(); System.out.println(seed.numberBags); } }
❌ A. Replace line 1 with BirdSeed(2); ❌ B. Replace line 2 with BirdSeed(2); ❌ C. Replace line 1 with new BirdSeed(2); ❌ D. Replace line 2 with new BirdSeed(2); ✅ E. Replace line 1 with this(2); ❌ F. Replace line 2 with this(2);
Explanation: Options A and B will not compile because constructors cannot be called without new. Options C and D will compile but will create a new object rather than setting the fields in this one. Option F will not compile because this() must be the first line of a constructor. Option E is correct.
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