[Solved] What is wrong with the following code?StringBuilder sb = new StringBuilder(); sb.append("Hello"); sb = sb + " World"; System.out.println(sb); | Java

Java - Strings and String Handling

What is wrong with the following code?

StringBuilder sb = new StringBuilder();
sb.append("Hello");
sb = sb + " World";
System.out.println(sb);

AStringBuilder objects cannot be printed using System.out.println.

BThe append method is used incorrectly; it should be appendAll instead.

CYou cannot use the '+' operator to concatenate a StringBuilder and a String.

DThe StringBuilder constructor requires an initial capacity argument.

Step-by-Step Solution

Solution:

Step 1: Analyze the '+' Operator Usage
The '+' operator is not defined for StringBuilder and String concatenation.
Step 2: Correct Way to Append
Use sb.append(" World") to add text to the StringBuilder.
Final Answer:
You cannot use the '+' operator to concatenate a StringBuilder and a String. correctly identifies the misuse of the '+' operator with StringBuilder.
Quick Check:
StringBuilder requires append() for concatenation, '+' is invalid [OK]

Quick Trick: Use append(), not '+' with StringBuilder [OK]

Common Mistakes:

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