public class Lion { public void roar(String roar1, StringBuilder roar2) { roar1.concat("!!!"); roar2.append("!!!"); } public static void main(String[] args) { String roar1 = "roar"; StringBuilder roar2 = new StringBuilder("roar"); new Lion().roar(roar1, roar2); System.out.println(roar1 + " " + roar2); } }
❌ A. roar roar ✅ B. roar roar!!! ❌ C. roar!!! roar ❌ D. roar!!! roar!!! ❌ E. An exception is thrown. ❌ F. The code does not compile.
Explanation: A String is immutable. Calling concat() returns a new String but does not change the original. A StringBuilder is mutable. Calling append() adds characters to the existing character sequence along with returning a reference to the same object
public class Lion { public void roar(String roar1, StringBuilder roar2) { roar1.concat("!!!"); roar2.append("!!!"); } public static void main(String[] args) { String roar1 = "roar"; StringBuilder roar2 = new StringBuilder("roar"); new Lion().roar(roar1, roar2); System.out.println(roar1 + " " + roar2); } }
❌ A. roar roar ✅ B. roar roar!!! ❌ C. roar!!! roar ❌ D. roar!!! roar!!! ❌ E. An exception is thrown. ❌ F. The code does not compile.
Explanation: A String is immutable. Calling concat() returns a new String but does not change the original. A StringBuilder is mutable. Calling append() adds characters to the existing character sequence along with returning a reference to the same object
BY Explanations “Top Java Quiz Questions”
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