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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.dava.internal.javaRep;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 Jerome Miecznikowski
 * %%
 * 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.BooleanType;
import soot.ByteType;
import soot.CharType;
import soot.Type;
import soot.jimple.IntConstant;

public class DIntConstant extends IntConstant {
  public Type type;

  private DIntConstant(int value, Type type) {
    super(value);
    this.type = type;
  }

  public static DIntConstant v(int value, Type type) {
    return new DIntConstant(value, type);
  }

  public String toString() {
    if (type != null) {
      if (type instanceof BooleanType) {
        if (value == 0) {
          return "false";
        } else {
          return "true";
        }
      }

      else if (type instanceof CharType) {
        String ch = "";

        switch (value) {

          case 0x08:
            ch = "\\b";
            break;
          case 0x09:
            ch = "\\t";
            break;
          case 0x0a:
            ch = "\\n";
            break;
          case 0x0c:
            ch = "\\f";
            break;
          case 0x0d:
            ch = "\\r";
            break;
          case 0x22:
            ch = "\\\"";
            break;
          case 0x27:
            ch = "\\'";
            break;
          case 0x5c:
            ch = "\\\\";
            break;

          default:
            if ((value > 31) && (value < 127)) {
              ch = new Character((char) value).toString();
            } else {
              ch = Integer.toHexString(value);

              while (ch.length() < 4) {
                ch = "0" + ch;
              }

              if (ch.length() > 4) {
                ch = ch.substring(ch.length() - 4);
              }

              ch = "\\u" + ch;
            }
        }

        return "'" + ch + "'";
      }

      else if (type instanceof ByteType) {
        return "(byte) " + new Integer(value).toString();
      }
    }

    return new Integer(value).toString();
  }
}