快速创建list并生成map

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最新推荐文章于 2024-10-19 06:09:15 发布

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public static void main(String[] args) {
	List<AnoleIntersection> intersections = new ArrayList<AnoleIntersection>() {
		{
			add(new AnoleIntersection() {{this.setId(1L);this.setTypeId(1L);}});
			add(new AnoleIntersection() {{this.setId(2L);this.setTypeId(1L);}});
			add(new AnoleIntersection() {{this.setId(3L);this.setTypeId(3L);}});
			add(new AnoleIntersection() {{this.setId(4L);this.setTypeId(4L);}});
			add(new AnoleIntersection() {{this.setId(5L);this.setTypeId(4L);}});
			add(new AnoleIntersection() {{this.setId(6L);this.setTypeId(6L);}});
			add(new AnoleIntersection() {{this.setId(7L);this.setTypeId(7L);}});
			add(new AnoleIntersection() {{this.setId(8L);this.setTypeId(1L);}});
		}
	};
	Map<Long, List<AnoleIntersection>> map = intersections.stream().collect(Collectors.groupingBy(AnoleIntersection::getTypeId));
	System.out.println(JSONObject.toJSONString(map));
}