Copies all of the elements from one list into another. - Java java.util

Java examples for java.util:List Element

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Description

Copies all of the elements from one list into another.

Demo Code


//package com.java2s;

import java.util.List;
import java.util.ListIterator;
import java.util.RandomAccess;

public class Main {
    public static void main(String[] argv) {
        List dest = java.util.Arrays.asList("asdf", "java2s.com");
        List src = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(copy(dest, src));
    }//www.  ja  v  a2  s  .c  o  m

    /**
     * 
     */
    private static final int COPY_THRESHOLD = 10;

    /**
     * Copies all of the elements from one list into another. After the
     * operation, the index of each copied element in the destination list will
     * be identical to its index in the source list. The destination list must
     * be at least as long as the source list. If it is longer, the remaining
     * elements in the destination list are unaffected.
     * <p>
     * This method runs in linear time.
     * @param <T> .
     * @param dest The destination list.
     * @param src The source list.
     * 
     * @return boolean isCopyValide
     */
    public static <T> Boolean copy(List<? super T> dest,
            List<? extends T> src) {

        Boolean isCopyValide = null;

        int srcSize = src.size();
        if (srcSize > dest.size()) {
            isCopyValide = false;
            throw new IndexOutOfBoundsException(
                    "Source does not fit in dest");

        }

        if (srcSize < COPY_THRESHOLD
                || (src instanceof RandomAccess && dest instanceof RandomAccess)) {
            for (int i = 0; i < srcSize; i++) {
                dest.set(i, src.get(i));
            }
        } else {
            ListIterator<? super T> di = dest.listIterator();
            ListIterator<? extends T> si = src.listIterator();
            for (int i = 0; i < srcSize; i++) {
                di.next();
                di.set(si.next());
            }
        }

        isCopyValide = true;

        return isCopyValide;
    }
}

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