高效开发之：List去重简便方法

常见写法：

  List<Integer> deployProcess = service.getDeployProcess(xxx);
  List<Integer> newList = new ArrayList<>(deployProcess.size());
        deployProcess.forEach(i -> {
            if (!newList.contains(i)) { // 如果新集合中不存在则插入
                newList.add(i);
            }
        });
        System.out.println("去重后的新集合:" + newList);
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可修改为利用java8新特性中的stream，进行便捷去重：

List<Integer> deployProcess = service.getDeployProcess(xxx);
deployProcess = deployProcess.stream().distinct().collect(Collectors.toList());
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