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Java - Long valueOf(String s) method
Description
The Java Long valueOf(String s) method returns an Long object holding the value of the specified String s.
Declaration
Following is the declaration for java.lang.Long.valueOf() method
public static Long valueOf(String s) throws NumberFormatException
Parameters
s − This is the string to be parsed.
Return Value
This method returns an Long object holding the value represented by the string argument.
Exception
NumberFormatException − if the string cannot be parsed as an integer.
Example 1
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 a positive long value. Then using valueOf() method, we're getting the object 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)); } }
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) method to get the Long object using the specified String having an long value. We've created a String variable and assigned it a negative long value. Then using valueOf() method, we're getting the object 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)); } }
Output
Let us compile and run the above program, this will produce the following result −
String = -170 valueOf = -170
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)); } }
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)