Java – Convert String to Long

[code lang=”java”]public class StringToLong {

public static void main(String args[]) {
String strLong = "2323232";

//Convert String to long using Long.valueOf(),better because
//it can cache frequently used long values
long number = Long.valueOf(strLong);
System.out.println("String to long conversion using valueOf :" + number);

//Convert String to long in Java using java.lang.Long object
strLong ="4444444444444444444";
Long numberObject = new Long(strLong);
number = numberObject; //auto boxing will take care of long to Long conversion
System.out.println("String to long conversion example using Long object: " + number);

//Convert String to long with Long.parseLong method in Java
strLong="999999999999999999";
Long parsedLong = Long.parseLong(strLong) ;
number = parsedLong; //auto-boxing will convert Long object to primitive long
System.out.println("String to long conversion using parseLong() method: " + number);

//Convert String to long using Long.decode() method in Java
strLong = "-1023454";
number = Long.decode(strLong);
System.out.println("String to long conversion using decode() method: " + number);

//String to long in hexadecimal format
strLong = "0xFFFF";
number = Long.decode(strLong);
System.out.println("String to long example in hex format decode() method: " + number);

//String to long in octal format
strLong = "0777";
number = Long.decode(strLong);
System.out.println("String to long example in octal format decode() method: " + number);
}
}[/code]
Output:

String to long conversion using valueOf :2323232
String to long conversion example using Long object: 4444444444444444444
String to long conversion using parseLong() method: 999999999999999999
String to long conversion using decode() method: -1023454
String to long example in hex format decode() method: 65535
String to long example in octal format decode() method: 511


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