1. 通过new ArrayList<>()

List<String> list = new ArrayList<>();

2.  通过Arrays.asList()

List<String> stringList = Arrays.asList("1", "2", "3");

3. 通过Hutool工具类CollectionUtil创建

List<String> listData = CollectionUtil.newArrayList("1", "2", "3");

hutool依赖: 

<dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.5.7</version>
 </dependency>

junit依赖:

<dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <!-- 不设置scope就是全局-->
            <scope>test</scope>
</dependency>

 

 完整测试代码:

package ;

import cn.hutool.core.collection.CollectionUtil;
import org.junit.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

@SpringBootTest
public class MyShopApplicationTests {

    @Test
    public void contextLoads() {
    }

    @Test
    public void createList() {
        List<String> list = new ArrayList<>();
        Collections.addAll(list, "1", "2", "3");
        System.out.println(list);
        List<String> stringList = Arrays.asList("1", "2", "3");
        System.out.println(stringList);
        List<String> listData = CollectionUtil.newArrayList("1", "2", "3");
        System.out.println(listData);
    }

}

打印结果:

[1, 2, 3]
[1, 2, 3]
[1, 2, 3]

java 创建一个list java如何创建一个list_创建list的方式有哪些