现有如下需求:
将List<User> 转换为List<IdAndName>类型
具体的实现如下:
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public class TestListTransform {
public static List<User> users = new ArrayList<>();
static {
for (int i = 0; i < 10; i++) {
users.add(new User(i, "tck" + i, i + 2, "[email protected]"));
}
}
public static void main(String[] args) {
List<IdAndName> collect = users.stream()
.map(user -> new IdAndName(user.getId(), user.getName()))
.collect(Collectors.toList());
System.out.println(collect);
}
}
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实体类User
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public class User {
private Integer id;
private String name;
private Integer age;
private String email;
public User() {
}
public User(Integer id, String name, Integer age, String email) {
this.id = id;
this.name = name;
this.age = age;
this.email = email;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
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实体类IdAndName
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public class IdAndName {
private Integer id;
private String name;
public IdAndName() {
}
public IdAndName(Integer id, String name) {
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "IdAndName{" +
"id=" + id +
", name='" + name + ''' +
'}';
}
}
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