WriteObjectTheOnlySynchronizedMethodCheck.java

import java.io.*;

public class RubberBall {

  public void bounce(float angle, float velocity) {
  }

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Noncompliant {{Remove this "synchronized" keyword.}}
  }
}

public class RubberBall2 {

  public void bounce(float angle, float velocity) {
  }

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Compliant, maybe FN because we include nested classes,
                                                                                        // which may or may not be synchronizing something relevant
  }

  class Nested {

    public void bounce(float angle, float velocity) {
    }

    private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Noncompliant {{Remove this "synchronized" keyword.}}
    }
  }

  class NestedCompliant {

    public Nested(Color color, int diameter) {
      synchronized (this) {
        System.out.println("This is OK");
      }
    }

    private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Compliant
    }

    private void writeObject(ObjectOutputStream stream) throws IOException { // Compliant
    }
  }
}

public class ClassWithSynchronizedStmtIsOK {

  public void bounce(float angle, float velocity) {
    synchronized (this) {
    }
  }

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Compliant
  }
}

public class TwoSynchrozniedMethodIsOK {

  public RubberBall(Color color, int diameter) {  }

  public synchronized void bounce(float angle, float velocity) {

  }

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Compliant
  }
}

public class Nested3 {

  private synchronized void writeObject(ObjectOutputStream stream) throws IOException { // Compliant
  }

  class Nested {
    Nested() {
      synchronized (this) {

      }
    }
  }
}