Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.lang.reflect.Array;

import java.util.Collection;

import java.util.HashSet;

public class Main {

    @SafeVarargs
    public static <T> HashSet<T> newHashSet(T... ts) {
        HashSet<T> set = new HashSet<T>();
        for (T t : ts) {
            set.add(t);
        }
        return set;
    }

    public static <T> HashSet<T> newHashSet(Collection<T> collection) {
        HashSet<T> set = new HashSet<T>();
        set.addAll(collection);
        return set;
    }

    @SafeVarargs
    public static <T> T[] addAll(T[]... arrays) {
        if (arrays.length == 1) {
            return arrays[0];
        }

        int length = 0;
        for (T[] array : arrays) {
            if (array == null) {
                continue;
            }
            length += array.length;
        }
        T[] result = newArray(arrays.getClass().getComponentType().getComponentType(), length);

        length = 0;
        for (T[] array : arrays) {
            if (array == null) {
                continue;
            }
            System.arraycopy(array, 0, result, length, array.length);
            length += array.length;
        }
        return result;
    }

    @SuppressWarnings("unchecked")
    public static <T> T[] newArray(Class<?> componentType, int newSize) {
        return (T[]) Array.newInstance(componentType, newSize);
    }
}