Java8 簡潔的匿名內部類使用Demo__Java

1、無傳回值V1版本

/** * Java8 簡潔的匿名內部類使用Demo * Created by wangyingjie1 on 2017/2/23. */public class ExecuteHelper {    public static void execute(Execute execute) {        execute.doExecute();    }    public static void execute(Execute execute, String umpKey) {        System.out.println("start========" + umpKey);        try {            execute.doExecute();        } catch (Exception e) {            System.out.println("umpKey===>" + umpKey);        }        System.out.println("end========" + umpKey);    }    private interface Execute {        void doExecute();    }    //測試匿名內部類的使用方式    public static void main(String[] args) {        ExecuteHelper.execute(() -> Study.print());        ExecuteHelper.execute(() -> Study.print(), "xxx");        //測試數組的輸出        String[] profiles = {"xxx", "yyyyy", "zzzzzzzzzzzz"};        String profilesStr = Arrays.stream(profiles).reduce((a, b) -> a + ", " + b).get();        System.out.println(profilesStr + "=======\n" + Arrays.toString(profiles));    }    public static class Study {        public static void print() {            System.out.println("Hello world*******");        }    }}

2、帶有傳回值V2版本

/** * Java8 簡潔的匿名內部類使用Demo * Created by wangyingjie1 on 2017/2/23. */public class ExecuteHelper {    public static void execute(Execute execute) {        execute.doExecute();    }    /**     * 帶有傳回值得執行方法、可以實現代碼的靜態織入     * @param execute     * @param umpKey     * @param <T>     * @return     */    public static <T> T execute(Execute execute, String umpKey) {        System.out.println("start========" + umpKey);        try {            return (T)execute.doExecute();        } catch (Exception e) {            System.out.println("umpKey===>" + umpKey);        }        System.out.println("end========" + umpKey);        return null;    }    private interface Execute {        Object doExecute();    }    //測試匿名內部類的使用方式    public static void main(String[] args) {        ExecuteHelper.execute(() -> Study.print());        String xxx = ExecuteHelper.execute(() -> Study.print(), "xxx");        String execute = ExecuteHelper.execute(() -> Study.sayHello("zhangsan"), "zzz");        System.out.println(xxx + "==========" + execute);    }    public static class Study {        public static String print() {            System.out.println("Hello world*******");            return "中國";        }        public static String sayHello(String userName) {            System.out.println("say Hello *******" + userName);            return "龍的傳人";        }    }}