Java7新特性（1）

Java7新特性（一）
1.语法糖 数字下划线

?4.final重抛对比上份代码
ublic class Coin {int test = 123_567; long test1 = 100_000L;@SafeVarargspublic static <T> Collection<T> doSomething(T... entries){return null;}public static void main(String[] args) {HashMap<String, String> a = new HashMap<>();HashMap<String, String> b = new HashMap<>();doSomething(a,b);}}
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