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What is difference and similarities between concat() and append() in java,given reason and example?

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What is difference and similarities between concat() and append() in java,given reason and example?
posted Jul 1, 2017 by Ajay Kumar

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1 Answer

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String concat() method concatenate or join two strings like String s1 and String s2 and return a third string(s3) as a result.
String s1="Uttar";
String s2="Pradesh";
String s3=s1.concat(s2);

String concat() method is immutable methods. In this method content of sting variable are not modify.
But append() method is mutable method of StingBuffer class. in this method content of StringBuffer class variable are modify.
StringBuffer sb=new StringBuffer("Uni");
sb.append("versity");

Preceding statements produce:"University".

answer Jul 2, 2017 by Saurabh Pandey
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