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Strings are fixed length collections of Unicode characters stored as an instance of the class.
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Most commonly, a string is created from a string literal or by using the constructor on an array of characters:
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String greeting = "Hello";
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or
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char[] bunch = {'H','e','l','l','o'};
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String greeting = new String(bunch);
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Once created, individual characters of a string cannot be changed in place. This example shows using the methods of indexing, catenation (+), and substring to create a new string with one character changed:
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String test = "Chicken soup with rice";
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int a = test.indexOf('w');
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String newtest = substring(1,a-1)+"is n"+substring(a+5);
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/* getting "Chicken soup is nice" */
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