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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.toolkits.scalar;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2002 Ondrej Lhotak
 * Copyright (C) 2007 Manu Sridharan
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import soot.PointsToAnalysis;
import soot.SootMethod;

/**
 * Just a pair of arbitrary objects.
 * 
 * @author Ondrej Lhotak
 * @author Manu Sridharan (genericized it)
 * @author xiao, extend it with more functions
 */
public class Pair {
  public Pair() {
    o1 = null;
    o2 = null;
  }

  public Pair(T o1, U o2) {
    this.o1 = o1;
    this.o2 = o2;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((o1 == null) ? 0 : o1.hashCode());
    result = prime * result + ((o2 == null) ? 0 : o2.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    @SuppressWarnings("rawtypes")
    Pair other = (Pair) obj;
    if (o1 == null) {
      if (other.o1 != null) {
        return false;
      }
    } else if (!o1.equals(other.o1)) {
      return false;
    }
    if (o2 == null) {
      if (other.o2 != null) {
        return false;
      }
    } else if (!o2.equals(other.o2)) {
      return false;
    }
    return true;
  }

  /**
   * Decide if this pair represents a method parameter.
   */
  public boolean isParameter() {
    if (o1 instanceof SootMethod && o2 instanceof Integer) {
      return true;
    }
    return false;
  }

  /**
   * Decide if this pair stores the THIS parameter for a method.
   */
  public boolean isThisParameter() {
    return (o1 instanceof SootMethod && o2.equals(PointsToAnalysis.THIS_NODE)) ? true : false;
  }

  public String toString() {
    return "Pair " + o1 + "," + o2;
  }

  public T getO1() {
    return o1;
  }

  public U getO2() {
    return o2;
  }

  public void setO1(T no1) {
    o1 = no1;
  }

  public void setO2(U no2) {
    o2 = no2;
  }

  public void setPair(T no1, U no2) {
    o1 = no1;
    o2 = no2;
  }

  protected T o1;
  protected U o2;
}