Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
// Licensed under the Apache License, Version 2.0 (the "License");

import java.util.ArrayList;

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

import java.util.RandomAccess;

public class Main {
    /**
     *  Resizes the passed list to N entries. Will add the specified object if
     *  the list is smaller than the desired size, discard trailing entries if
     *  larger. This is primarily used to presize a list that will be accessed
     *  by index, but it may also be used to truncate a list for display.
     *
     *  @return The list, as a convenience for callers
     *
     *  @throws UnsupportedOperationException if the list does not implement
     *          <code>RandomAccess</code> and its list iterator does not
     *          support the <code>remove()</code> operation
     */
    public static <T> List<T> resize(List<T> list, int newSize, T obj) {
        if (list instanceof ArrayList)
            ((ArrayList<T>) list).ensureCapacity(newSize);

        if (list.size() < newSize) {
            for (int ii = list.size(); ii < newSize; ii++)
                list.add(obj);
        } else if (list.size() > newSize) {
            if (list instanceof RandomAccess) {
                for (int ii = list.size() - 1; ii >= newSize; ii--)
                    list.remove(ii);
            } else {
                ListIterator<T> itx = list.listIterator(newSize);
                while (itx.hasNext()) {
                    itx.next();
                    itx.remove();
                }
            }
        }

        return list;
    }

    /**
     *  Resizes the passed list to N entries. Will add nulls if the list is
     *  smaller than the desired size, discard trailing entries if larger.
     *  This is primarily used to presize a list that will be accessed by
     *  index, but it may also be used to truncate a list for display.
     *
     *  @return The list, as a convenience for callers
     *  @throws UnsupportedOperationException if the list does not implement
     *          <code>RandomAccess</code> and its list iterator does not
     *          support the <code>remove()</code> operation
     */
    public static <T> List<T> resize(List<T> list, int newSize) {
        return resize(list, newSize, null);
    }
}