Java - Long getLong() method

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Description

The Java Long getLong(String nm) method determines the long value of the system property with the specified name.

Declaration

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

public static Long getLong(String nm)

Parameters

nm − This is the property name.

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));
   }
} 

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 null.

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));
   }
} 

Output

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

null