Como Usar Operadores Customizados com a exp4j

Com withOperation

import static java.lang.System.out;

import de.congrace.exp4j.Calculable;
import de.congrace.exp4j.CustomOperator;
import de.congrace.exp4j.ExpressionBuilder;

public final class Exp4jSample {

  public static void main(final String[] args) throws Exception {
    final Calculable calc = new ExpressionBuilder("1 > 1").withOperation(new CustomOperator(">") {

      @Override
      protected double applyOperation(final double[] args) {
        return args[0] + args[1];
      }
      
    }).build();

    out.println(calc.calculate());
  }

}

Com withOperations

import static java.lang.System.out;

import java.util.ArrayList;
import java.util.Collection;

import de.congrace.exp4j.Calculable;
import de.congrace.exp4j.CustomOperator;
import de.congrace.exp4j.ExpressionBuilder;

public final class Exp4jSample {

  public static void main(final String[] args) throws Exception {
    final Collection<CustomOperator> operLst = new ArrayList<CustomOperator>();

    operLst.add(new CustomOperator(">") {

      @Override
      protected double applyOperation(double[] args) {
        return args[0] + args[1];
      }
      
    });
    
    final Calculable calc = new ExpressionBuilder("1 > 1").withOperations(operLst).build();

    out.println(calc.calculate());
  }

}

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