AtomicBoolean compareAndSet() method in Java with Examples
The java.util.concurrent.atomic.AtomicBoolean.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(boolean expect, boolean 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 Boolean is equal to expect.
Return Value: The function returns a boolean value, it returns true on success else false.
Below programs illustrate the above function:
Program 1:
import java.util.concurrent.atomic.AtomicBoolean;
public class GFG {
public static void main(String args[])
{
AtomicBoolean val = new AtomicBoolean( false );
System.out.println( "Previous value: "
+ val);
boolean res = val.compareAndSet( false , true );
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: false
The value was updated and it is true
Program 2:
import java.util.concurrent.atomic.AtomicBoolean;
public class GFG {
public static void main(String args[])
{
AtomicBoolean val = new AtomicBoolean( true );
System.out.println( "Previous value: "
+ val);
boolean res = val.compareAndSet( true , false );
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: true
The value was updated and it is false
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicBoolean.html#compareAndSet(boolean, %20boolean)
Last Updated :
27 Feb, 2019
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