java中BiConsumer的用法

pom依赖：

            junit
            junit
            4.12

 CalMap类：

package study.com.biconsumer;
import java.util.*;
import java.util.function.BiConsumer;
public class CalMap {


    private Map map;

    private List nameList;

    private final BiConsumer biConsumer;


    public CalMap(Map map, BiConsumer biConsumer) {
        this.map = map;

        this.biConsumer = biConsumer;
    }


    public void transForm(Map map){
        map.forEach((key, value) -> {
           biConsumer.accept(key,value);
        });
    }

}

TestBiConsumer测试类：

package study.com.biconsumer;
import org.junit.Test;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class TestBiConsumer {

    private List nameList = new ArrayList<>();

    
    public void combine(Object key, Object value) {
        if(key instanceof String && value instanceof String){
            String result = key+"_"+value;
            System.out.println("======= result: "+result+"=======");
            nameList.add(result);
        }
    }

    @Test
    public void testBiConsumer(){
        Map map = new HashMap<>();
        map.put("江西省赣州市","张三");
        map.put("江西省鹰潭市","李四");
        CalMap calMap = new CalMap(map,this::combine);
        calMap.transForm(map);
        System.out.println("======集合大小："+nameList.size());
    }

}

运行结果：