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JAVA8 - 使用stream api进行list集合指定字段去重背景

有一个list,实体包含多个字段,当其中两个字段值均相同时,就认为list中的这两条记录是一样的

去重

java8中有一个collectingAndThen可以根据多个字段去重

依据姓名和年龄去重,当姓名和年龄相同时,认为这两个实体相同

class FlightTicketInfo {

private String orderNumber; private String userName; private String age; public FlightTicketInfo(String orderNumber, String userName, String age) { this.orderNumber = orderNumber; this.userName = userName; this.age = age; } @Override public String toString() { return "FlightTicketInfo{" + "orderNumber='" + orderNumber + '\'' + ", userName='" + userName + '\'' + ", age='" + age + '\'' + '}'; } public String getOrderNumber() { return orderNumber; } public String getUserName() { return userName; } public String getAge() { return age; }

}

@Test public void testList(){ List infoList = new ArrayList(); infoList.add(new FlightTicketInfo("11111", "xiaoming", "22")); infoList.add(new FlightTicketInfo("22222", "xiaoming", "22")); infoList.add(new FlightTicketInfo("33333", "xiaoming", "23")); infoList.add(new FlightTicketInfo("11111", "xiaoming", "22")); infoList.stream() .collect(Collectors.collectingAndThen(Collectors.toCollection(() -> new TreeSet(Comparator.comparing(f -> f.getUserName()+f.getAge()))), ArrayList::new)) .forEach(System.out::println); }

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JAVA8

JAVA8

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