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private volatile int a;
private volatile int b;

public int getSum() throws ArithmeticException {
  // Check for integer overflow
  if( b > 0 ? a > Integer.MAX_VALUE - b : a < Integer.MIN_VALUE - b ) { 
    throw new ArithmeticException("Not in range");
  }

  return a + b;
}

public intvoid setValues(int a, int b) {
  this.a = a;
  this.b = b;
}

private volatile int a;
private volatile int b;

public synchronized int getSum() throws ArithmeticException {
  // Check for integer overflow
  if( b > 0 ? a > Integer.MAX_VALUE - b : a < Integer.MIN_VALUE - b ) { 
    throw new ArithmeticException("Not in range");
  }

  return a + b;
}

public synchronized intvoid setValues(int a, int b) {
  this.a = a;
  this.b = b;
}