when we compare String each others.... suppose we have declared two String variables when to use a.equal(b) and (a==b) ?????

Answer 1

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https://code.sololearn.com/cZms6c3vg2w3/?ref=app

Answer 2

Use of .equal() method is the preferable way opposed to use of == operator whenever a comparison of content was the goal.

The == operator checks whether the two String shares the same reference, not content.