What will be output of following java program.

Question

class Test{
public static void main (String[] arg){
String s = "Hello";
s.concat("Guys");
System.out.println(s);
}
}

Answer 1

metod append() works with BufferString.

I think here you needn't append
System.out.println(s+"Guys");
This is enough.

Answer 2

It gives Error that can't find the symbol. There variable s should be object.

Try this

class Test{
public static void main (String[] arg){

StringBuffer sb = new StringBuffer("Hello"); sb.append(" Guys"); System.out.println(sb);
}
}

Answer 3

Just run it in the code playground :)

Answer 4

Martin Taylor It was my mistake instead of using concat() method I used append() method

Answer 5

Ya, your suggestion is good, But It's not answer of my question.