File Compare and Highlight - Java [closed]

Answer 1

Copying one of my answers from a related question:

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I would go for netbeans diff api.

• How to use the diff api in netbeans and,
• NetBeans Diff API

From the later url:

Although not a visual implementation, you also have a translation of gnu diff in java.

Answer 2

In Eclipse right click on filename in navigator bar, then select "Compare With".

Answer 3

The google-diff-match-path library seems to provide the functionality you need. Here's a demo of it in action.