Java tutorial
//package com.java2s; /* * Copyright (C) 2014 The Android Open Source Project * * 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 { /** * Parses a percentage and returns a scaled float. * @param s contains the number to parse. * @return a float scaled number. 1.0 represents 100%. * @throws NumberFormatException if the number format is invalid or does not end with '%'. */ public static float parsePercentage(String s) throws NumberFormatException { if (!s.endsWith("%")) { throw new NumberFormatException("Percentages must end with %"); } return Float.parseFloat(s.substring(0, s.length() - 1)) / 100; } }