英文:
How to get the elements which specified field value value is max from object list
问题
如何从对象列表中获取特定字段值为最大的元素？
public class MyObj {
private String name;
private int value;
// getter & setter
}
List<MyObj> list = Arrays.asList(
new MyObj("a", 1),
new MyObj("b", 1),
new MyObj("c", 2),
new MyObj("d", 2),
new MyObj("e", 3),
new MyObj("f", 3)
);
// 如何获取值最大的对象，这里是 MyObj("e", 3) 和 MyObj("f", 3)
List<MyObj> maxList = //todo ;
注意：不获取最大值本身
英文:
How to get the elements which specified field value value is max from object list?
public class MyObj {
private String name;
private int value;
// getter & setter
}
List<MyObj> list = Arrays.asList(
new MyObj("a", 1),
new MyObj("b", 1),
new MyObj("c", 2),
new MyObj("d", 2),
new MyObj("e", 3),
new MyObj("f", 3)
);
// how to get the objs which value is max, here is MyObj("e", 3) and MyObj("f", 3)
List<MyObj> maxList = //todo ;
Note: not to get the max value
答案1
得分: 2
这将完成任务。首先根据值获取最大值，然后根据该值筛选列表。
int maxValue = list.stream()
.mapToInt(MyObj::getValue)
.max().orElse(Integer.MIN_VALUE);
List<MyObj> maxList = list.stream()
.filter(obj -> obj.getValue() == maxValue)
.collect(Collectors.toList());
英文:
This will do the job. It first gets the max value based on the value and filters the list based on that value.
int maxValue = list.stream()
.mapToInt(MyObj::getValue)
.max().orElse(Integer.MIN_VALUE);
List<MyObj> maxList = list.stream()
.filter(obj -> obj.getValue() == maxValue)
.collect(Collectors.toList());
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