List随机取值

1. ListToRandomValue

import com.google.common.collect.Lists;
import org.junit.Test;
import java.util.Collections;
import java.util.List;
import java.util.Random;

/**
 * list随机取值
 */
public class ListToRandomValue {


    public List getList(){
        List list = Lists.newArrayList();
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        list.add("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");
        return list;
    }


    @Test
    public void getRandomValue_01(){
        List list = getList();
        int index = (int) (Math.random()* list.size());
        System.out.println(list.get(index));
    }


    @Test
    public void getRandomValue_02(){
        List list = getList();
        int index = new Random().nextInt(list.size());
        System.out.println(list.get(index));
    }


    @Test
    public void getRandomValue_03(){
        List list = getList();
        // shuffle 打乱顺序
        Collections.shuffle(list);
        System.out.println(list.get(0));
    }
}