Java .equals between String and StringBuilder

by

Because they both are Different objects.

String object!= StringBuilder object.

But,Your doubt is 

name1.equals(s)  returning true

Because in String class equals method ovverided in such a way.

And to get the desired output convert your StringBuilder to String.

System.out.println(s.equals(sb.toString())); //return true.

If you see the Source code of String#equals()

1012    public boolean  equals(Object anObject) {
1013        if (this == anObject) {
1014            return true;
1015        }
1016        if (anObject instanceof String) {             //key line 
1017            String anotherString = (String)anObject;
1018            int n = count;
1019            if (n == anotherString.count) {
1020                char v1[] = value;
1021                char v2[] = anotherString.value;
1022                int i = offset;
1023                int j = anotherString.offset;
1024                while (n-- != 0) {
1025                    if (v1[i++] != v2[j++])
1026                        return false;
1027                }
1028                return true;
1029            }
1030        }
1031        return false;
1032    }

The line if (anObject instanceof String) { always returns false incase if you pass StringBuilder.

More Related Contents:

  1. Integer division: How do you produce a double?
  2. How do I use Comparator to define a custom sort order?
  3. Java, Classpath, Classloading => Multiple Versions of the same jar/project
  4. How to get a unique computer identifier in Java (like disk ID or motherboard ID)?
  5. DBCP – validationQuery for different Databases
  6. JBoss debugging in Eclipse
  7. No Dialect mapping for JDBC type: 1111
  8. Java regular expressions and dollar sign
  9. How to catch a Firebase Auth specific exceptions
  10. How to reference a method in javadoc?
  11. scp transfer via java
  12. Read next word in java
  13. Closing a runnable JOptionPane
  14. Is there a way to ignore a single FindBugs warning?
  15. How to open JavaFX .jar file with JDK 11?
  16. Spring Data JPA: Batch insert for nested entities
  17. Java try/catch performance, is it recommended to keep what is inside the try clause to a minimum?
  18. JavaFX: Update of ListView if an element of ObservableList changes
  19. Embedding Gecko/WebKit in Java
  20. Java dynamic function calling
  21. Can’t make Jackson and Lombok work together
  22. How To Modify The Raw XML message of an Outbound CXF Request?
  23. Why should I care that Java doesn’t have reified generics?
  24. Java’s varargs performance
  25. Java PreparedStatement UTF-8 character problem
  26. Compile Java source code from a string? [duplicate]
  27. Creating a jar file from a Scala file
  28. How to serialize and deserialize Java 8’s java.time types with Gson? [closed]
  29. How to support multiple android version in your code?
  30. java.lang.ArrayIndexOutOfBoundsException: 0

Leave a Comment