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Java-Stream-flatMap
Leave leave1 = new Leave("1","1",new Date(),CollUtil.newArrayList("A","B")); Leave leave2 = new Leave("2","2",new Date(),CollUtil.newArrayList("C","D")); Leave leave3 =Java-Stream-flatMap
Leave leave1 = new Leave("1","1",new Date(),CollUtil.newArrayList("A","B")); Leave leave2 = new Leave("2","2",new Date(),CollUtil.newArrayList("C","D")); Leave leave3 =