Question

I am beginner to Java, and I am reading up on Arrays from the tutorial at Oracle.

My question involves this code:

class ArrayCopyDemo {
    public static void main(String[] args) {
        char[] copyFrom = { 'd', 'e', 'c', 'a', 'f', 'f', 'e',
            'i', 'n', 'a', 't', 'e', 'd' };
        char[] copyTo = new char[7];

        System.arraycopy(copyFrom, 2, copyTo, 0, 7);
        System.out.println(new String(copyTo));
    }
}

Specifically,

 System.out.println(new String(copyTo));

What does new String(copyTo) exactly do, or rather why use new and String? What are they doing together? (I understand that they print out “caffein” but only in a very general sense.

Answer 1

The JavaDoc is your friend:

public String(char[] value)

Allocates a new String so that it
represents the sequence of characters currently contained in the
character array argument. The contents of the character array are
copied; subsequent modification of the character array does not affect
the newly created string.

Parameters:

value – The initial value of the
string