Exam 1z0-829 topic 1 question 25 discussion

thousand separator in numeric literals is accepted from java7 10_00 means 1000

CD but there's an error with the display of Answer option D D. Integer res = 250; res =+ s2; This will only return 1000 in result because there's no operator like =+ The correct choice of answer would be as below (for D), D. Integer res = 250; res += s2;

package q25; public class Q25 { public static void main(String[] args) { String s = "10_00"; Integer s2 = 10_00; // Line n1 // A. // Integer res = 250 + Integer.parseInt(s); // parseInt exception. // B. // Integer res = 250 + Integer.valueOf(s); // parseInt exception. // C. // Integer res = 250 + s2; // at the end, result = 1250 . // D. Integer res = 250; res += s2; // At then end, result = 1250 . // E. // Integer res = 250 + s; // Syntax error. // F. // Integer res = 250 + Integer(s2); // Syntax error. System.out.println(res); } }

Should be C and D, but D should have "+=" instead of "=+". I've tried all the alternatives in an online compiler and these are the only ones that work. A and B would work if "s" were "1000", but parseInt() and valueOf() arent able to handle the underscore in "10_00". E is just plain wrong cuz s is a string and cant be automatically cast to an int. F is wrong cuz "Integer()" casting doesn't exist. One would instead use valueOf() to cast.