guava的一些用法

package guavaTest;

import com.google.common.base.CharMatcher;
import com.google.common.base.Joiner;
import com.google.common.base.Splitter;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Lists;
import com.google.common.primitives.Ints;
import com.google.common.util.concurrent.*;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;

import java.util.List;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Google guava 的使用
 */
public class GuavaTest {

    //连接器(对于Joiner，常用的方法是   跳过NULL元素：skipNulls()  /  对于NULL元素使用其他替代：useForNull(String))
    // private static final Joiner joiner = Joiner.on(",").skipNulls();
    private static final Joiner joiner = Joiner.on(",").useForNull("我是空字符串");

    //分割器(对于Splitter，常用的方法是：trimResults()/omitEmptyStrings()。注意拆分的方式，有字符串，还有正则，还有固定长度分割（太贴心了！）)
    private static final Splitter splitter = Splitter.on(",").trimResults().omitEmptyStrings();


    public static void main(String[] args) {

        String join = joiner.join(Lists.newArrayList("a", null, "b"));
        System.out.println("join:" + join);

        // a,  ,b,,
        for (String tmp : splitter.split("bb,lll,kkk,,,,,,,,")) {
            System.out.println("|" + tmp + "|");
        }

        List<Integer> integers = Ints.asList(1, 2, 3, 4, 5, 6);

        System.out.println(Ints.join(",", 1, 2, 3, 4));

        //原生数组类型快速合并
        int[] concat = Ints.concat(new int[]{1, 2, 3}, new int[]{7, 8, 9});
        System.out.println(concat.length);

        //求最大、最小
        System.out.println(Ints.max(concat) + "" + Ints.min(concat));

        //是否包含，不用循环查找了
        System.out.println(Ints.contains(concat, 9));

        //集合到数组的转换
        System.out.println(Ints.toArray(integers));

        //Map<String,List<String>>
        ArrayListMultimap<String, String> listMultimap = ArrayListMultimap.create();

        listMultimap.put("张晓明", "数学");
        listMultimap.put("张晓明", "语文");
        listMultimap.put("张晓明", "物理");
        listMultimap.put("王小二", "英语");

        test();

    }


    public static void test() {

        ExecutorService service = Executors.newFixedThreadPool(10);
        ListeningExecutorService listeningExecutorService = MoreExecutors.listeningDecorator(service);
        ListenableFuture<Integer> listenableFuture = listeningExecutorService.submit(() -> {

            if (new Random().nextInt(3) == 2) {
                throw new NullPointerException();
            }
            return 1;

        });

        FutureCallback<Integer> futureCallback = new FutureCallback<Integer>() {

            @Override
            public void onSuccess(@NullableDecl Integer result) {
                System.out.println("---------" + result);
            }

            @Override
            public void onFailure(Throwable t) {
                System.out.println("------------" + t.getMessage());
            }


        };

        Futures.addCallback(listenableFuture, futureCallback);


    }

}