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Can a constructor be synchronized in Java?
No, a constructor cannot be synchronized in Java. The JVM ensures that only one thread can invoke a constructor call at a given point in time. That is why no need to declare a constructor as synchronized and it is illegal in Java. However, we can use synchronized blocks inside a constructor.
If we are trying to put a synchronized keyword before a constructor, the compiler says that "error: modifier synchronized not allowed here".
Example
public class SynchronizedConstructorTest { // declaration of synchronized constructor public synchronized SynchronizedConstructorTest() { System.out.println("Synchronized Constructor"); } public static void main(String args[]) { SynchronizedConstructorTest test = new SynchronizedConstructorTest(); } }
Output
SynchronizedConstructorTest.java:3: error: modifier synchronized not allowed here public synchronized SynchronizedConstructorTest() { ^ 1 error
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