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I need to perform Diffs between Java strings. I would like to be able to rebuild a string using the original string and diff versions. Has anyone done this in Java? What library do you use?
String a1; // This can be a long text String a2; // ej. above text with spelling corrections String a3; // ej. above text with spelling corrections and an additional sentence Diff diff = new Diff(); String differences_a1_a2 = Diff.getDifferences(a,changed_a); String differences_a2_a3 = Diff.getDifferences(a,changed_a); String[] diffs = new String[]{a,differences_a1_a2,differences_a2_a3}; String new_a3 = Diff.build(diffs); a3.equals(new_a3); // this is true 
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To find the difference between 2 Strings you can use the StringUtils class and the difference method. It compares the two Strings, and returns the portion where they differ.
toString(); int final_ = Integer. parseInt(addquantity) - Integer. parseInt(subquantity);
You can compare two Strings in Java using the compareTo() method, equals() method or == operator. The compareTo() method compares two strings. The comparison is based on the Unicode value of each character in the strings.
This library seems to do the trick: google-diff-match-patch. It can create a patch string from differences and allow to reapply the patch.
edit: Another solution might be to https://code.google.com/p/java-diff-utils/
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