Java tutorial
//package com.java2s; /* * Copyright (c) 2016 Aalto University * * 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 { public static long strToLong(String strVal) { if (strVal == null || strVal.isEmpty()) return 0; byte[] vals = strVal.getBytes(); int tailFlag = vals.length > 8 ? 8 : vals.length; long result = 0; for (int i = 0; i < tailFlag; i++) { result = result << 8; result += vals[i]; } return result; } }