Finally.java

/**
 * Finally.java
 *
 * Copyright 2014 the original author or authors.
 *
 * We licenses this file to you 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.
 */
package org.apache.niolex.common.lang;

/**
 * The return value in finally will overlap the original return.
 *
 * @author <a href="mailto:xiejiyun@foxmail.com">Xie, Jiyun</a>
 * @version 1.0.0
 * @since 2014-4-18
 */
public class Finally {

    public static void main(String[] args) {
        System.out.println("Ret value = " + retValue());
        System.out.println();

        try {
            System.out.println("Throw ex in finally = " + throwEx());
        } catch (Exception e) {
            System.out.println("Exception throwed in finally = " + e);
        }

        System.out.println();
        System.out.println("Ret Exception in try block = " + retEx(null));

        System.out.println();
        System.out.println("Ret No catch = " + retNoCatch(null));
    }

    @SuppressWarnings("finally")
    public static String retValue() {
        try {
            System.out.println("In try ...");
            return "in try return";
        } finally {
            System.out.println("In finally ...");
            return "in finally";
        }
    }

    @SuppressWarnings("finally")
    public static String throwEx() {
        try {
            System.out.println("In try ...");
            return "in try return";
        } finally {
            System.out.println("In finally ...");
            throw new NullPointerException();
        }
    }

    @SuppressWarnings("finally")
    public static String retEx(Object o) {
        try {
            System.out.println("In try ...");
            System.out.println(o.hashCode());
            System.out.println("After try ...");
            return "in try return";
        } catch (Exception e) {
            System.out.println("In exception ...");
            throw e;
        } finally {
            System.out.println("In finally ...");
            return "in finally";
        }
    }

    @SuppressWarnings("finally")
    public static String retNoCatch(Object o) {
        try {
            System.out.println("In try ...");
            System.out.println(o.hashCode());
            System.out.println("After try ...");
            return "in try return";
        } finally {
            System.out.println("In finally ...");
            return "in finally";
        }
    }

}