Java “?” Operator for checking null - What is it? (Not Ternary!)

Question

I was reading an article linked from a slashdot story, and came across this little tidbit:

Take the latest version of Java, which tries to make null-poi

Answer 1

If someone is looking for an alternative for old java versions, you can try this one I wrote:

/**
 * Strong typed Lambda to return NULL or DEFAULT VALUES instead of runtime errors. 
 * if you override the defaultValue method, if the execution result was null it will be used in place
 * 
 * 
 * Sample:
 * 
 * It won't throw a NullPointerException but null.
 * 
 * {@code
 *  new RuntimeExceptionHandlerLambda () {
 *      @Override
 *      public String evaluate() {
 *          String x = null;
 *          return x.trim();
 *      }  
 *  }.get();
 * }
 * 
 * 
 * 
 * @author Robson_Farias
 *
 */

public abstract class RuntimeExceptionHandlerLambda {

    private T result;

    private RuntimeException exception;

    public abstract T evaluate();

    public RuntimeException getException() {
        return exception;
    }

    public boolean hasException() {
        return exception != null;
    }

    public T defaultValue() {
        return result;
    }

    public T get() {
        try {
            result = evaluate();
        } catch (RuntimeException runtimeException) {
            exception = runtimeException;
        }
        return result == null ? defaultValue() : result;
    }

}