Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2012 Joakim Persson, Daniel Augurell, Adrian Bjugard, Andreas Rolen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Finds out if a number is a prime number or not.
     * 
     * @param number
     *            The possible prime number
     * @return If it is a prime number or not
     */
    public static boolean isPrime(int number) {

        if (number < 2) {
            return false;
        }

        if (number == 2) {
            return true;
        }

        if (number % 2 == 0) {
            return false;
        }

        int root = (int) Math.sqrt((double) number);

        for (int j = 2; j <= root; j++) {
            if (number % j == 0) {
                return false;
            }
        }
        return true;
    }
}