changing string to integer in java code example

Example 1: convert string to int java

String myString = "1234";
int foo = Integer.parseInt(myString);

Example 2: in java how to convert string to integer

class scratch{
    public static void main(String[] args) {
        String str = "54";
        int num = Integer.parseInt("54");
        double doub = Double.parseDouble("54");
    }
}