Java List Intersect intersect(List in1, List in2)

Description

intersect

License

Open Source License

Declaration

public static <T> List<T> intersect(List<T> in1, List<T> in2) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.ArrayList;

import java.util.List;

public class Main {
    public static <T> List<T> intersect(List<T> in1, List<T> in2) {

        final List<T> theResults = new ArrayList<T>(0);

        if (in1 == null || in2 == null || in1.isEmpty() || in2.isEmpty()) {

            return theResults;
        }/* w w  w  .  j  a  v  a 2  s.  c  o m*/

        for (final T anObject : in1) {

            if (anObject == null && in2.contains(null)) {

                theResults.add(anObject);

            } else if (anObject != null && in2.contains(anObject)) {

                theResults.add(anObject);
            }
        }

        return theResults;
    }

    public static <T> List<T> intersect(List<T> in1, T[] in2) {

        final List<T> theResults = new ArrayList<T>(0);

        if (in1 == null || in2 == null || in1.isEmpty() || in2.length == 0) {

            return theResults;
        }

        for (final T anObject : in1) {

            if (isContaining(in2, anObject)) {

                theResults.add(anObject);
            }
        }

        return theResults;
    }

    public static <T> List<T> intersect(T[] in1, List<T> in2) {

        return intersect(in2, in1);
    }

    /**
     * @param inValue
     * @return length is 0 or depending on setting a reaction <code>null</code>
     *         value
     */
    public static boolean isEmpty(String inValue, boolean isNullEmpty) {

        return inValue == null ? isNullEmpty : inValue.isEmpty();
    }

    public static <T> boolean isContaining(T[] inValues, T inValue) {

        if (inValues == null) {
            return false;
        }

        for (final T aValue : inValues) {

            if (aValue == inValue) {
                return true;
            } else if (aValue != null && aValue.equals(inValue)) {
                return true;
            }
        }

        return false;
    }

    public static boolean equals(Object inO1, Object inO2) {

        return equals(inO1, inO2, true);
    }

    public static boolean equals(Object inO1, Object inO2, boolean isBothNullEqual) {

        if (inO1 == null && inO2 == null) {
            return isBothNullEqual;
        } else if (inO1 == null && inO2 != null) {
            return false;
        } else if (inO2 == null && inO1 != null) {
            return false;
        }

        return inO1.equals(inO2);
    }
}

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2. intersect(List ls, List ls2)
3. intersect(List lst1, List lst2)
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8. intersectAll(final List collector, final T[] a, final T[] b)
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