How to convert String to long and long to String in java


In this core java tutorial we will learn how to convert String to long primitive type in java and convert String to long object with program and examples in java. We will  also understand  When to use convert String to long primitive type and when when to convert String to long object in java.




Programs  to convert String to long in java -
  • Program/Example 1 to How to convert String to long primitive type in java.
  • Program/Example 2 to How to convert String to long object in java.


Program/Example 1 to How to convert String to long primitive type in java

Long.parseLong(string) method returns primitive type long object.

package convertStringToLongPkg;
public class ConvertStringToLongExample1 {
   public static void main(String[] args) {
          String string = "12";
          try {
                 long l = Long.parseLong(string);
                 System.out.println("long number = " + l);
          } catch (NumberFormatException e) {
                 e.printStackTrace();
          }
   }
}
/*OUTPUT
long number = 12
*/

If in case invalid string is passed which can't get converted to long will throw NumberFormatException in java.




Program/Example 2 to How to convert String to long object in java

Long.valueOf(string) method returns long object.

package convertStringToLongPkg;
public class ConvertStringToLongExample2 {
   public static void main(String[] args) {
          String string = "12";
          Long longObject  = Long.valueOf(string);
          System.out.println("long longObject = " + longObject);
         
   }
}
/*OUTPUT
long longObject = 12
*/





Programs to convert long to String in java -
  • Program/Example 3 to How to convert long primitive type to String  in java.
  • Program/Example 4 to How to convert long object to String in java


Now, in this core java tutorial we will learn how to convert long primitive type to String in java and convert long object to String with program and examples in java. We will  also understand  When to use convert String to long primitive type and when when to convert String to long object in java.

Program/Example 3 to How to convert long primitive type to String  in java.

String.valueOf(long) method converts long primitive type to String  in java.

package convertLongToStringPkg;
public class ConvertLongToStringExample1 {
   public static void main(String[] args) {
          long l = 12L;
          String string = String.valueOf(l);
          System.out.println("string = "+string);
  
   }
}
/*OUTPUT
string = 12

*/



Program/Example 4 to How to convert long object to String in java
toString() method of java.lang.Long class convert long object to String in java.
package convertLongToStringPkg;
public class ConvertLongObjectToStringExample2 {
   public static void main(String[] args) {
          Long longObject = 12L;
          String string = longObject.toString();
          System.out.println("string = "+string);
  
   }
}
/*OUTPUT
string = 12
*/





Summary -



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