How to swap two String variables in java without using a third variable

References
http://stackoverflow.com/questions/18528697/how-to-swap-two-string-variables-in-java-without-using-a-third-variable

See also

• For a Given node of a binary tree, print the K distance nodes.
• Find the distance between 2 nodes in Binary Tree
• Find the distance between 2 nodes in Binary Tree
• Program to count leaf nodes in a binary tree
• Friend Circle - Hackerrank