使用Guava把List转Map

摘要: 今天在做项目时,正好需要把List转成Map,网上查了查,限于JDK是1.7,所以使用的是Google的guava工具包来实现，在这里记录一下。

这里只是举一个例子：

1、创建一个实体类（学生类）

public class Student {

private Integer id;
private String name;
private Integer age;

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}

@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", age=" + age + "]";
}

}

2、创建一个测试类

import java.util.List;
import java.util.Map;
import com.google.common.base.Function;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class TestDemo {
public static void main(String[] args) {

Student student1 = new Student();
student1.setId(110);
student1.setName("李明");
student1.setAge(23);

Student student2 = new Student();
student2.setName("明浩");
student2.setId(119);
student2.setAge(24);

List<Student> list = Lists.newArrayList();

list.add(student1);
list.add(student2);

Map<Integer,Student> mappedMovies = Maps.uniqueIndex(list, new Function<Student,Integer>() {
@Override
public Integer apply(Student student) {
return student.getId();
}});

System.out.println("根据学号查学生名称："+mappedMovies.get(110).getName());
}

}

3、guava 下载地址
下载到本地

maven :

<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>19.0</version>
</dependency>