Java List Permutate permutation(List list1, List list2, String token)

Description

permutation

License

Open Source License

Declaration

public static List<String> permutation(List<String> list1, List<String> list2, String token) 

Method Source Code

//package com.java2s;
/*/*  ww  w.  j av  a  2 s.c  om*/
 * $RCSfile: StringUtil,v $$
 * $Revision: 1.0  $
 * $Date: 2011  $
 *
 * Copyright (C) 2011 GyTech, Inc. All rights reserved.
 *
 * This software is the proprietary information of GyTech, Inc.
 * Use is subject to license terms.
 */

import java.util.ArrayList;
import java.util.List;

public class Main {
    public static final String Empty = "";

    public static List<String> permutation(List<String> list1, List<String> list2, String token) {
        List<String> result = new ArrayList<String>();

        for (String s1 : list1) {
            for (String s2 : list2) {
                StringBuilder sb = new StringBuilder();

                sb.append(s1);

                if (!isEmpty(token)) {
                    sb.append(token);
                }

                sb.append(s2);

                result.add(sb.toString());
            }
        }

        return result;
    }

    /**
    * @param args
    * @return boolean
    */
    public static boolean isEmpty(String... args) {
        if (args != null && args.length > 0) {
            for (String s : args) {
                if (s == null || s.trim().length() == 0) {
                    return true;
                }
            }

            return false;
        }

        return true;
    }

    /**
    * @param b
    * @return String
    * @author: lizj
    */
    public static String toString(boolean b) {
        return Boolean.toString(b);
    }

    /**
    * @param b
    * @return String
    * @author: lizj
    */
    public static String toString(byte b) {
        return Byte.toString(b);
    }

    /**
    * @param b
    * @return String
    * @author: lizj
    */
    public static String toString(char c) {
        return Character.toString(c);
    }

    /**
    * @param s
    * @return String
    * @author: lizj
    */
    public static String toString(short s) {
        return Short.toString(s);
    }

    /**
    * @param i
    * @return String
    * @author: lizj
    */
    public static String toString(int i) {
        return Integer.toString(i);
    }

    /**
    * @param f
    * @return String
    * @author: lizj
    */
    public static String toString(float f) {
        return Float.toString(f);
    }

    /**
    * @param d
    * @return String
    * @author: lizj
    */
    public static String toString(double d) {
        return Double.toString(d);
    }

    /**
    * @param l
    * @return String
    * @author: lizj
    */
    public static String toString(long l) {
        return Long.toString(l);
    }

    /**
    * @param b
    * @return
    * @author: lizj
    */
    public static String toString(Boolean b) {
        return b != null ? b.toString() : Empty;
    }

    /**
    * @param b
    * @return String
    * @author: lizj
    */
    public static String toString(Byte b) {
        return b != null ? b.toString() : Empty;
    }

    /**
    * @param s
    * @return String
    * @author: lizj
    */
    public static String toString(Short s) {
        return s != null ? s.toString() : Empty;
    }

    /**
    * @param c
    * @return String
    * @author: lizj
    */
    public static String toString(Character c) {
        return c != null ? c.toString() : Empty;
    }

    /**
    * @param i
    * @return String
    * @author: lizj
    */
    public static String toString(Integer i) {
        return i != null ? i.toString() : Empty;
    }

    /**
    * @param f
    * @return String
    * @author: lizj
    */
    public static String toString(Float f) {
        return f != null ? f.toString() : Empty;
    }

    /**
    * @param d
    * @return String
    * @author: lizj
    */
    public static String toString(Double d) {
        return d != null ? d.toString() : Empty;
    }

    /**
    * @param l
    * @return String
    * @author: lizj
    */
    public static String toString(Long l) {
        return l != null ? l.toString() : Empty;
    }

    /**
    * @param s
    * @return String
    * @author: lizj
    */
    public static String toString(String s) {
        return s != null ? s : Empty;
    }

    /**
    * @param buf
    * @return String
    * @author: lizj
    */
    public static String toString(StringBuffer buf) {
        return buf != null ? buf.toString() : Empty;
    }

    /**
    * @param b
    * @param defaultValue
    * @return String
    */
    public static String toString(boolean b, String defaultValue) {
        return Boolean.toString(b);
    }

    /**
    * @param b
    * @param defaultValue
    * @return String
    * @author: lizj 
    */
    public static String toString(byte b, String defaultValue) {
        return Byte.toString(b);
    }

    /**
    * @param b
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(char c, String defaultValue) {
        return Character.toString(c);
    }

    /**
    * @param s
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(short s, String defaultValue) {
        return Short.toString(s);
    }

    /**
    * @param i
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(int i, String defaultValue) {
        return Integer.toString(i);
    }

    /**
    * @param f
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(float f, String defaultValue) {
        return Float.toString(f);
    }

    /**
    * @param d
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(double d, String defaultValue) {
        return Double.toString(d);
    }

    /**
    * @param l
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(long l, String defaultValue) {
        return Long.toString(l);
    }

    /**
    * @param b
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Boolean b, String defaultValue) {
        return (b != null ? b.toString() : defaultValue);
    }

    /**
    * @param b
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Byte b, String defaultValue) {
        return (b != null ? b.toString() : defaultValue);
    }

    /**
    * @param s
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Short s, String defaultValue) {
        return (s != null ? s.toString() : defaultValue);
    }

    /**
    * @param c
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Character c, String defaultValue) {
        return (c != null ? c.toString() : defaultValue);
    }

    /**
    * @param i
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Integer i, String defaultValue) {
        return (i != null ? i.toString() : defaultValue);
    }

    /**
    * @param f
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Float f, String defaultValue) {
        return (f != null ? f.toString() : defaultValue);
    }

    /**
    * @param d
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Double d, String defaultValue) {
        return (d != null ? d.toString() : defaultValue);
    }

    /**
    * @param l
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(Long l, String defaultValue) {
        return (l != null ? l.toString() : defaultValue);
    }

    /**
    * @param s
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(String s, String defaultValue) {
        return (s != null ? s : defaultValue);
    }

    /**
    * @param buf
    * @param defaultValue
    * @return String
    * @author: lizj
    */
    public static String toString(StringBuffer buf, String defaultValue) {
        return (buf != null ? buf.toString() : defaultValue);
    }

    /**
    * @param s
    * @return String
    * @author lizj
    */
    public static String trim(String s) {
        return (s != null ? s.trim() : Empty);
    }
}

Related

1. perm(List l)
2. permsList(List topList)
3. permutate(List src)
4. permutation(String prefix, String s, List list)
5. permutations(List list)
6. permutations(List listings)
7. permutations(Map> parameterValues)