AtomicInteger compareAndSet() method in Java with examples
Last Updated :
31 Jan, 2019
The java.util.concurrent.atomic.AtomicInteger.compareAndSet() is an inbuilt method in java that sets the value to the passed value in the parameter if the current value is equal to the expected value which is also passed in the parameter. The function returns a boolean value which gives us an idea if the update was done or not.
Syntax:
public final boolean compareAndSet(int expect, int val)
Parameters: The function accepts two mandatory parameters which are described below:
- expect: which specifies the value that the atomic object should be.
- val: which specifies the value to be updated if the atomic integer is equal to expect.
Return value: The function returns a boolean value, it returns true on success else false.
Program below demonstrates the function:
Program 1:
import java.util.concurrent.atomic.AtomicInteger;
public class GFG {
public static void main(String args[])
{
AtomicInteger val = new AtomicInteger( 0 );
System.out.println( "Previous value: "
+ val);
boolean res = val.compareAndSet( 0 , 6 );
if (res)
System.out.println( "The value was"
+ " updated and it is "
+ val);
else
System.out.println( "The value was "
+ "not updated" );
}
}
|
Output:
Previous value: 0
The value was updated and it is 6
Program 2:
import java.util.concurrent.atomic.AtomicInteger;
public class GFG {
public static void main(String args[])
{
AtomicInteger val
= new AtomicInteger( 0 );
System.out.println( "Previous value: "
+ val);
boolean res = val.compareAndSet( 10 , 6 );
if (res)
System.out.println( "The value was"
+ " updated and it is "
+ val);
else
System.out.println( "The value was "
+ "not updated" );
}
}
|
Output:
Previous value: 0
The value was not updated
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html#compareAndSet–
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