Analyze the following code carefully. Please select the one that applies.public class Test { public static void main(String[] args) { A a = new A(); a.print(); }}class A { String s; A(String s) { this.s = s; }void print() { System.out.println(s); }}Group of answer choicesThe program would compile and run if you change A a = new A() to A a = new A(5).The program has a compile error because class A does not have a default constructor.The program compiles and runs fine and prints nothing.The program has a compile error because class A is not a public class.
Question
Analyze the following code carefully. Please select the one that applies.public class Test { public static void main(String[] args) { A a = new A(); a.print(); }}class A { String s; A(String s) { this.s = s; }void print() { System.out.println(s); }}Group of answer choicesThe program would compile and run if you change A a = new A() to A a = new A(5).The program has a compile error because class A does not have a default constructor.The program compiles and runs fine and prints nothing.The program has a compile error because class A is not a public class.
Solution
The program has a compile error because class A does not have a default constructor.
Here's why:
In Java, if you don't provide any constructor in your class, compiler inserts default constructor for you, but if you declare any constructor (in your case you have a parameterized constructor in class A), compiler does not insert the default constructor.
In your main method, you're trying to create an object of class A using default constructor which is not available in the class definition. Hence, it will throw a compile time error.
To fix this, you can either provide a default constructor in class A or you need to pass a String while creating object of class A because as per the current code, class A only has a parameterized constructor which accepts a String.
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