string and long conversion

Two methods of converting String to Long

1. Long.valueOf("String") returns the Long packaging type

2. Long.parseLong("String") returns the long basic data type

String type time to Long type timestamp

String time = "";
Long timestamp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(time).getTime();

Three methods of converting Long to String

1. Add an empty string directly at the end

        long a = 123;
        String s = a + ""; 

2、 String.valueof()

long a = 123;

 String s =String.valueof(a) ;  

3、 Long.toString()

 long a = 123;        
 String s = Long.toString(a) ;