Question

1. Consider the following code segment.

String str = "AP";
str += "CS " + 1 + 2;
System.out.println(str);
What is printed as a result of executing the code segment?

A: CS AP12

B: AP CS3

C: CSAP 12

D: APCS 12

E: APCS 3

2. Consider the following code segment.

String dessert = "pie";
dessert += "straw" + dessert + "berry";
What is the value of dessert after the code segment has been executed?

A: strawpieberry

B: piestrawpieberry

C: strawpieberrypie

D: strawberry

E: piestrawberry

3. Which of the following code segments can be used to set the value of the string str to "Good morning, sunshine!" ?

I. String str = "Good " + "morning," + " sunshine!";
II. String str = "Good";
str += " morning, sunshine!";
III. String str = " morning, ";
str = "Good" + str + "sunshine!";

A: I only

B: II only

C: III only

D: II and III only

4. Consider the following code segment.

String one = "ABC123";
String two = "C";
String three = "3";
System.out.println(one.indexOf(two));
System.out.println(one.indexOf(three));
System.out.println(two.indexOf(one));
What is printed when the code segment is executed?

A:2
5
-1

B:2
5
2

C:2
6
-1

D:3
6
-1

E:-1
-1
2

Answer 1

Answers

1 ) option D -> APCS 12

Reason :- actually that statement means str = str + "CS "+1+2; , we know that addition is left associative , so first str + "CS " => APCS , then 1 is added to it (here 1 is integer but it is added to a string so it converted automatically to string while adding. therfore it becomes APCS 1 , then 2 is added with this string => APCS 12 , and this is stored to str.

2 ) option B -> piestrawpieberry

Reason :- actually the statement means dessert=dessert + "straw" + dessert + "berry" ; ,we know that addition is left associative , so string "straw" is first append to variable dessert that is "pie" , so it becomes "piestraw ", then dessert variable is again added to it , then it becomes "piestrawpie" , then string "berry" is added to it and it becomes "piestrawpieberry" , and only at  last it is stored to variable dessert , so no dessert contains "piestrawpieberry".

3 ) option D - >  II and III only

Reason : In the first code segment it gives only "Goodmorning, sunshine!" , there is no space between Good and morning as in the question , so it is incorrect .

4 ) option  A - >

2
5
-1

Reason :- System.out.println(one.indexOf(two)); //this will print the position of string one in two ie : the occurence of "C" in  "ABC123"  which is equal to 2.
System.out.println(one.indexOf(three)); //this will print the position of "3" in "ABC123" ie 5 .
System.out.println(two.indexOf(one)); // the string one is not in string two ie  "ABC123" is not in "C" , because of the function return -1 .

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