In the below code, which code fragment should be inserted

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In the below code, which code fragment should be inserted at line 3 so that the output will be: “234pqr 234pqr”?


1. StringBuilder strbuilder = new StringBuilder("234");
2. String str = "234";
3.  // insert code here
4. System.out.println(strbuilder + " " + str);

1. strbuilder .append(“pqr”); str.concat(“pqr”);
2. strbuilder .append(“pqr”); str1 = str1.concat(“pqr”);
3. strbuilder .append(“pqr”); str.append(“pqr”);
4. strbuilder .concat(“pqr”); str.append(“pqr”);
5. None of these

Correct Option: B

append() is stringbuffer method and concat is String class method.
append() is stringbuffer method and concat is String class method.