String, int convert

https://beginnersbook.com/2013/12/how-to-convert-string-to-double-in-java/

1. String to Int

1.1 e.g.

String number = "10";
int result = Integer.parseInt(number);
System.out.println(result);

1.2 e.g.

String number = "10";
Integer result = Integer.valueOf(number);
System.out.println(result);

1.3 e.g. NumberFormatException

If the string does not contain a parsable integer, aNumberFormatExceptionwill be thrown.

String number = "10A";
int result = Integer.parseInt(number);
System.out.println(result);

output: throw an Exception.

2. String to Double

e.g.

3. int to String

1. String.valueOf()

e.g.

int var = 111;
String str = String.valueOf(var);

1. Integer.toString()

e.g.

int ivar2 = 200;
String str2 = Integer.toString(ivar2);