目录
实体类测试Lambda.Stream输出结果
实体类
@Data
public class StreamTest {
private Integer id
;
private Integer age
;
private String name
;
public StreamTest(Integer id
, Integer age
, String name
) {
this.id
= id
;
this.age
= age
;
this.name
= name
;
}
}
测试Lambda.Stream
public static void main(String
[] args
) {
List
<StreamTest> list
= new ArrayList<>();
StreamTest object
= new StreamTest(1,25,"ABC");
StreamTest object1
= new StreamTest(2,24,"DEF");
StreamTest object2
= new StreamTest(3,25,"GHI");
StreamTest object3
= new StreamTest(4,18,"JKL");
list
.add(object
);
list
.add(object1
);
list
.add(object2
);
list
.add(object3
);
List
<Integer> ids
= list
.stream().map(StreamTest
::getId
).collect(Collectors
.toList());
System
.err
.println("所有的id : "+ids
);
List
<Integer> ages
= list
.stream().map(StreamTest
::getAge
).collect(Collectors
.toList());
System
.out
.println("未去重的年龄 : "+ages
);
List
<Integer> agess
= list
.stream().map(StreamTest
::getAge
).distinct().collect(Collectors
.toList());
System
.err
.println("已去重的年龄 : "+agess
);
}
输出结果
所有的id : [1, 2, 3, 4]
未去重的年龄 : [25, 24, 25, 18]
已去重的年龄 : [25, 24, 18]
