Java - Long getLong() method



Description

The Java Long getLong(String nm, Long val) method determines the long value of the system property with the specified name.The argument val is the default value. The default value is returned if there is no property of the specified name, if the property does not have the correct numeric format, or if the specified name is empty or null.

Declaration

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

public static Long getLong(String nm, Long val)

Parameters

  • nm − This is the property name.

  • val − This is the default value.

Return Value

This method returns the Long value of the property.

Exception

NA

Example 1

The following example shows the usage of Long getLong() method to get Long value of a system property. We've created a string variable and assigned it a valid system property string. Then using getLong() method, we're printing the Long value of the system property.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {

      // determines the long value of the system property 
      String str = "sun.arch.data.model";
      System.out.println(Long.getLong(str, new Long(5L)));
   }
} 

Output

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

64

Example 2

The following example shows the usage of Long getLong() method to get Long value of a non-existent system property. We've created a string variable and assigned it a invalid system property string. Then using getLong() method, we're checking the Long value of the system property which will be printed as 5 as we've passed a default value in second parameter.

package com.tutorialspoint;
public class LongDemo {
   public static void main(String[] args) {

      // determines the long value of the system property 
      String str = "java";
      System.out.println(Long.getLong(str, new Long(5L)));
   }
} 

Output

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

5
java_lang_long.htm
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