Exam 1z0-819 topic 1 question 9 discussion

b: public static void main(String[] args) { String s = "joe"; System.out.println(checkPerson(s)); s= null; System.out.println(checkPerson(s)); } public static String checkPerson(String s) { if(s==null) { s= "mary"; }else {s= null;} return s; } null mary

A is correct, check person never modified value for p so take the values from main method

class Person{ private String name; public Person(String name) { this.name = name; } public String toString() { return name; } } class Test { public static void main(String[] args) throws IOException { Person p = new Person("Joe"); checkPerson(p); System.out.println(p); p=null; checkPerson(p); System.out.println(p); } public static Person checkPerson(Person p) { if (p == null) { p = new Person("Mary"); } else { p = null; } return p; } } -> A

It's A. If it would have been p = checkPerson(p); Then correct answer would have been answer Null and then Mary. Now it's just checkPerson(p) so p remains "Joe" and then Null.

1th checkperson transforms joe to null , so system.out.print print null 2th checkperson recieve null and transforms this null to mary , so system.out.print print in the console "mary"

A is correct

A is CORRECT

B. Correct

A is correct because Changes in references of Person p are in the Person class so that object has different scope So There will be no effect on the Tester class object.

is correct A

A is the correct Answer