Map遍历（Java8和普通）

不用java8

    public void testErgodicWayThree() {
        System.out.println("---------------------Before JAVA8 ------------------------------");
        for (Map.Entry entry : map.entrySet()) {
            System.out.println("key:value = " + entry.getKey() + ":" + entry.getValue());
        }
        System.out.println("---------------------JAVA8 ------------------------------");
        map.entrySet().forEach(entry -> System.out.println("key:value = " + entry.getKey() + ":" + entry.getValue()));
    }

使用Java8

    /**
     * 遍历Map第五种
     * 通过k,v遍历，Java8独有的
     */
    @Test
    public void testErgodicWayFive() {
        System.out.println("---------------------Only JAVA8 ------------------------------");
        map.forEach((k, v) -> System.out.println("key:value = " + k + ":" + v));
    }