Here you can find the source of assertUnreachable()
public static <T> T assertUnreachable()
//package com.java2s; /*/*w w w . j av a 2s . co m*/ * Copyright 2004-2010 the Seasar Foundation and the Others. * * 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 <T> T assertUnreachable() { throw new AssertionError("Unreachable."); } public static <T> T assertUnreachable(String message) { throw new AssertionError("Unreachable. " + message); } public static <T> T assertUnreachable(Throwable throwable) { throw new AssertionError(throwable); } }