Java - Long valueOf(String s, long radix) method

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Description

The Java Long valueOf(String s, int radix) method returns an Long object holding the value extracted from the specified String s when parsed with the radix given by the second argument radix.

Declaration

Following is the declaration for java.lang.Long.valueOf() method

public static Long valueOf(String s, int radix) throws NumberFormatException

Parameters

• s − This is the string to be parsed.

• radix − This is the radix to be used in interpreting s.

Return Value

This method returns an Long object holding the value represented by the string argument in the specified radix.

Exception

NumberFormatException − if the String does not contain a parsable long.

Example 1

The following example shows the usage of Long valueOf(String s, long radix) method to get the Long object using the specified String having an long value. We've created a String variable and assigned it a long value. Then using valueOf() method, we're getting the object of decimal equivalent value and printing it.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      String s = "170";
      System.out.println("String = " + s);
    
      /* returns the Long object of the given string */
      System.out.println("valueOf = " + Long.valueOf(s, 10));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

String = 170
valueOf = 170

Example 2

The following example shows the usage of Long valueOf(String s, long radix) method to get the Long object using the specified String having an long value. We've created a String variable and assigned it a long value. Then using valueOf() method, we're getting the object of octal equivalent value and printing it.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      String s = "170";
      System.out.println("String = " + s);
    
      /* returns the Long object of the given string */
      System.out.println("valueOf = " + Long.valueOf(s,8));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

String = 170
valueOf = 120

Example 3

The following example shows the usage of Long valueOf(String s) method to get the Long object using the specified String having an long value. We've created a String variable and assigned it an invalid long value. Then using valueOf() method, we're trying to get the object and printing it. It will throw NumberFormatException.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {
      String s = "0x170";
      System.out.println("String = " + s);
    
      /* returns the Long object of the given string */
      System.out.println("valueOf = " + Long.valueOf(s,8));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

String = 0x170
Exception in thread "main" java.lang.NumberFormatException: For input string: "0x170"
	at java.lang.NumberFormatException.forInputString(Unknown Source)
	at java.lang.Long.parseLong(Unknown Source)
	at java.lang.Long.valueOf(Unknown Source)
	at com.tutorialspoint.LongDemo.main(LongDemo.java:11)