In the following Java code, which code fragment should be inserted at line 3 so that the output will be: "123abc 123abc"?
1. StringBuilder sb1 = new StringBuilder("123");
2. String s1 = "123";
3. // insert code here
4. System.out.println(sb1 + " " + s1);
1. StringBuilder sb1 = new StringBuilder("123");
2. String s1 = "123";
3. // insert code here
4. System.out.println(sb1 + " " + s1);A. sb1.append("abc"); s1.append("abc");
B. sb1.append("abc"); s1.concat("abc");
C. sb1.concat("abc"); s1.append("abc");
D. sb1.append("abc"); s1 = s1.concat("abc");
Answer: Option D
This Question Belongs to Java Program >> Strings
append() is stringbuffer method and concat is String class method.