What is the method in Java for converting a string into a number?

There are several methods in Java to convert a string to a number.

1. Convert the string to an integer using the parseInt() method of the Integer class.
2. Convert the string “123” to an integer using the Integer class.
3. Convert a string to a float using the parseDouble() method of the Double class.
4. Assign the value “3.14” to a string variable named str, and then convert it to a double data type and assign it to a variable named num.
5. Convert a string to a floating-point number using the parseFloat() method of the Float class.
6. Convert the string “3.14” into a float number using the parseFloat method.
7. Convert a string to a long integer using the parseLong() method of the Long class.
8. Convert the string “123456789” into a long integer and store it in the variable num.
9. Convert a string to a large integer using the constructor of the BigInteger class.
10. Convert the string “12345678901234567890” to a BigInteger object named num.
11. Convert a string to a large floating point number using the constructor of the BigDecimal class.
12. Create a BigDecimal variable named ‘num’ and initialize it with the value of the string “3.141592653589793238462643383279”.

Please choose the appropriate method of conversion based on your needs.