函数命令置于Java 语言程序

冷若凝霜1

聚集把持：
package com.infosys.setl.fp;
import org.apache.commons.functor.UnaryPredicate;
import org.apache.commons.functor.core.composite.UnaryAnd;
import org.apache.commons.functor.core.composite.UnaryNot;
import org.apache.commons.functor.core.composite.UnaryOr;
public class SetOps
{
  public static UnaryPredicate union(UnaryPredicate up1, UnaryPredicate up2)
  { return new UnaryOr(up1, up2);
  }   public static UnaryPredicate intersection(UnaryPredicate up1, UnaryPredicate up2)
  { return new UnaryAnd(up1, up2);
  }   public static UnaryPredicate difference(UnaryPredicate up1, UnaryPredicate up2)
  { return new UnaryAnd(up1, new UnaryNot(up2));
  }   public static UnaryPredicate symmetricDifference(UnaryPredicate up1,     UnaryPredicate up2)
  { return difference(union(up1, up2), intersection(up1, up2));
  }
}