The string constructors

The String class supports various constructors. To make a null String, you call the default constructor. instance,

String s = new String ();

will create an object of string along with no characters in it.

Often, you will need to create strings which have initial values. A string class provides a variety of constructors to handle this. For create a string initialized through an array of characters, use the constructor displays here:

String(char c[ ]) (Char Chars [ ])

Here is an instance

Char chars[]={'a','b','c'};

String s = new String(c);

This constructor initializes s along with the string "abc".

You could specify a sub range of a character array as an initializer by using the subsequent constructor:

String(char chars[],int startIndex, int numChars)

In the given syntax, startIndex specifies the index at that the subrange starts, and numChars specifies the number of characters to use.

Here is an example:

char chars[]= { 'a', 'b','c','d','e','f',};

String s = new String(chars,2,3);

This initializes s along with the characters cde.

You  can  construct  a  string  object  which  holds  the  similar  character  sequence  as another string object by using this constructor:

String(String s)

Here, s is a string object. Let consider this example:

//Construct one string from another.

class MakeString {

public static void main(String a[ ]) {

char c[] = { 'J','a','v','a'};

String s1 = new String(c);

String s2 = new String(s1);

System.out.println(s1);

System.out.println(s2);

}

}

The output is as follows:

Java

Java

As you could see s1, s2 holds the similar string.