Here you can find the source of compare(String lhs, String rhs)
public static int compare(String lhs, String rhs)
//package com.java2s; /******************************************************************************* * Copyright 2012-present Pixate, Inc./* w w w . java 2 s . co m*/ * * 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 int compare(String lhs, String rhs) { if (lhs == null) { return rhs == null ? 0 : 1; } return rhs == null ? -1 : lhs.compareTo(rhs); } }