使用java 8将对象列表按类型列表的对象属性进行分组：

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        // 创建对象列表
        List<MyObject> objects = Arrays.asList(
                new MyObject("Type1", Arrays.asList("A", "B")),
                new MyObject("Type2", Arrays.asList("C", "D")),
                new MyObject("Type1", Arrays.asList("E", "F")),
                new MyObject("Type2", Arrays.asList("G", "H"))
        );

        // 使用Stream API和Collectors.groupingBy()方法按类型属性进行分组
        Map<String, List<List<String>>> groupedObjects = objects.stream()
                .collect(Collectors.groupingBy(MyObject::getType,
                        Collectors.mapping(MyObject::getProperties, Collectors.toList())));

        // 打印分组结果
        groupedObjects.forEach((type, properties) -> {
            System.out.println("Type: " + type);
            System.out.println("Properties: " + properties);
            System.out.println();
        });
    }
}

class MyObject {
    private String type;
    private List<String> properties;

    public MyObject(String type, List<String> properties) {
        this.type = type;
        this.properties = properties;
    }

    public String getType() {
        return type;
    }

    public List<String> getProperties() {
        return properties;
    }
}

Type: Type1
Properties: [[A, B], [E, F]]

Type: Type2
Properties: [[C, D], [G, H]]