Exam 1z0-808 topic 1 question 85 discussion

boolean valueOf(string s) The Boolean returned represents a true value if the string argument is not null and is equal, ignoring case, to the string "true" https://docs.oracle.com/javase/8/docs/api/java/lang/Boolean.html#valueOf-boolean- Which means it returns false when a string is equal to "1"

answer is: false false

false false

C is the correct answer

java Test 1 null 1 and null are Strings because args type is String[]. public static Boolean valueOf(String s) { return parseBoolean(s) ? TRUE : FALSE; } If the specified boolean is true, then the string "true" will be returned, otherwise the string "false" will be returned. In this case, if the value is not true, all other String values return false.

c is ans

Answer is C. Remember to run in command line "java Test 1 null". boolean a = new Boolean(Boolean.valueOf(args[0])); boolean b = new Boolean(args[1]); System.out.println( a + " " + b );

Correct is C, The default valor of a boolean type is false. When the valor is null, in boolean case, it is automatically transformed into false. In the line 2, as the boolean value was not started, so it is false too. Answer False False.

if we pass other then true(equals ignore case) as a Boolean argument then it is referred as false.