Which of the following correctly creates an array of five empty Strings?Group of answer choicesString[] a = new String [5];String[] a = {"", "", "", "", ""};String[5] a;String[ ] a = new String [5]; for (int i = 0; i < 5; i++) a[i] = null;
Question
Which of the following correctly creates an array of five empty Strings?Group of answer choicesString[] a = new String [5];String[] a = {"", "", "", "", ""};String[5] a;String[ ] a = new String [5]; for (int i = 0; i < 5; i++) a[i] = null;
Solution 1
The correct way to create an array of five empty Strings in Java is:
String[] a = new String [5];
This creates an array of Strings with a length of 5. By default, each element in the array is initialized to null.
The second option:
String[] a = {"", "", "", "", ""};
This also creates an array of five Strings, but they are not empty, they are initialized with empty Strings.
The third option:
String[5] a;
This is incorrect syntax in Java. The size of the array should be specified when it is instantiated, not when it is declared.
The fourth option:
String[ ] a = new String [5];
for (int i = 0; i < 5; i++) a[i] = null;
This is also a correct way to create an array of five empty Strings in Java. However, it is unnecessary to set each element to null because they are already null by default.
Solution 2
The correct answer is: String[] a = new String [5];
This line of code creates an array of Strings with a length of 5. By default, all elements in the array are initialized to null in Java.
The second option: String[] a = {"", "", "", "", ""}; also creates an array of five strings, but they are not empty, they are initialized with empty strings.
The third option: String[5] a; is incorrect syntax in Java. The correct syntax to declare an array in Java is: String[] a;
The fourth option: String[ ] a = new String [5]; for (int i = 0; i < 5; i++) a[i] = null; is also correct, but it's redundant because when you create an array of objects in Java, it's automatically filled with the default value null. So, there's no need to manually set each element to null.
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