Java String variable setting – reference or value?

by

java Strings are immutable, so your reassignment actually causes your variable to point to a new instance of String rather than changing the value of the String.

String s1 = "ab";
String s2 = s1;
s1 = s1 + "c";
System.out.println(s1 + " " + s2);

on line 2, s1 == s2 AND s1.equals(s2). After your concatenation on line 3, s1 now references a different instance with the immutable value of “abc”, so neither s1==s2 nor s1.equals(s2).

More Related Contents:

  1. can't input value for string?
  2. What is the difference between a variable, object, and reference? [duplicate]
  3. Get variable by name from a String
  4. Strings in Java : equals vs == [duplicate]
  5. Duplicating objects in Java
  6. How do I print my Java object without getting “SomeType@2f92e0f4”?
  7. Java String split removed empty values
  8. Read/Write String from/to a File in Android
  9. What’s the best way to check if a String represents an integer in Java?
  10. Does Java have support for multiline strings?
  11. Comparing strings with == which are declared final in Java
  12. String comparison and String interning in Java
  13. Simple way to count character occurrences in a string [duplicate]
  14. How to check if a String contains only ASCII?
  15. Is it better practice to use String.format over string Concatenation in Java?
  16. How to convert/parse from String to char in java?
  17. Using Locales with Java’s toLowerCase() and toUpperCase()
  18. How to upper case every first letter of word in a string? [duplicate]
  19. Java converting int to hex and back again
  20. How do I copy the contents of one ArrayList into another?
  21. How can I start a new android activity using class name in a string?
  22. Remove Null Value from String array in java
  23. Java String literals concatenation
  24. How do I find out if first character of a string is a number?
  25. comparison of two Strings doesn’t work in android [duplicate]
  26. Generate fixed length Strings filled with whitespaces
  27. Creating a factory method in Java that doesn’t rely on if-else
  28. Find all words with 3 letters with regex
  29. Comparing a string with the empty string (Java)
  30. Create a SortedMap in Java with a custom Comparator

Leave a Comment