What are strings in java?

Answer 1

The String class is defined in the java.lang package and hence is implicitly available to all the programs in Java. The String class is declared as final, which means that it cannot be subclassed. It extends the Object class and implements the Serializable, Comparable, and CharSequence interfaces.

Answer 2

A string contains a series of characters.
A string can be seen as an array of characters.
There are some useful methods in the string class that make it more
useful than a character array to manipulate characters.

String str = "abc";
is equivalent to
char data[] = {'a', 'b', 'c'};

Answer 3

The String.format() method allows you format arguments (including strings) as a string.

The format specifiers for general, character, and numeric types have the following syntax: %[argument_index$][flags][width][.precision]conversion

Example:

String s = "foo";

String out = String.format("%-10s %d", s, 123);

System.out.println(out);

Output: (note spaces replaced with '.' to show whitespace).

foo........123

The negative width (e.g. -10) in the format causes the string to be left-justified. A positive width would be right-justified by default.

Note: System.out.printf() also uses the same mechanism to write a formatted string to output stream using the specified format string and arguments.

Answer 4

To declare a String in java:

String a = "hello";

In the above line, we created a String called a, and assigned the value hello to it.