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Can we install two java versions in same machine? If yes, do we face any problems while executing the program?

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I have installed 3 (Java6, Java7 and java8) since we work on different products which are on different java versions. No, you won't face any problems while executing any programs.
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MCA, PGDCA, ADCSSAA (All Computers Apps), B.Sc.(Chemistry (PCM group))

Yes, we can. If you are not sure, install another version on different drive and use it by setting its path.
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MCA, PGDCA, ADCSSAA (All Computers Apps), B.Sc.(Chemistry (PCM group))

"this" keyword in Java is a reference variable that refers to the current object. It can be used to refer current class instance variable.
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