RandomUtilTest.java

package com.opslab.util;

import com.opslab.util.RandomUtil;
import com.opslab.util.collection.CollectionUtil;
import org.junit.Test;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import static com.opslab.util.RandomUtil.integer;
import static junit.framework.Assert.assertEquals;


public class RandomUtilTest {

    @Test
    public void testInteger(){
        for(int i=0;i<10;i++){
            System.out.println(integer(0,10));
        }
        for(int i=0;i<10;i++){
            System.out.println(integer(20,30));
        }

        for(int i=0;i<10;i++){
            System.out.println(integer(100,110));
        }

        for (int i = 0; i < 100000; i++) {
            System.out.println(integer(1,1000000000));
        }
    }

    @Test
    public void testInteger1(){
        Map<Integer,Integer> map = new HashMap();
        for (int i = 0; i < 1000; i++) {
            int integer = RandomUtil.integer(1, 100);
            if(map.containsKey(integer)){
                map.put(integer,map.get(integer)+1);

            }else{
                map.put(integer,1);
            }
        }
        System.out.println(CollectionUtil.join(map,"\n","="));
    }

    @Test
    public void testName() throws Exception {

        System.out.println(integer(30,10));
        System.out.println(integer(0,10));
        System.out.println(RandomUtil.number(10));
        System.out.println(RandomUtil.number(10));
        System.out.println(RandomUtil.String(10));
        System.out.println(RandomUtil.MixString(10));
        System.out.println(RandomUtil.LowerString(10));
        System.out.println(RandomUtil.UpperString(10));
        System.out.println(RandomUtil.ZeroString(10));
        System.out.println(RandomUtil.toFixdLengthString(123, 10));
        System.out.println(RandomUtil.toFixdLengthString(123L, 10));
        int[] in = {1, 2, 3, 4, 5, 6, 7};
        System.out.println(RandomUtil.getNotSimple(in, 3));
    }

    @Test
    public void testUuid(){
        System.out.println(RandomUtil.uuid());
        System.out.println(RandomUtil.UUID());
        System.out.println(RandomUtil.squid());
        System.out.println(RandomUtil.squid());
        System.out.println(RandomUtil.squid());
        for(int i=0;i<10;i++){
            Set<String> set = new HashSet<>(100000);
            for(int j=0;j<100000;j++){
                set.add(RandomUtil.squid());
            }
            assertEquals("出现重复主键",100000,set.size());
        }

    }
    @Test
    public void testRandomItem(){
        for (int j = 0; j < 10; j++) {
            Map<Integer,Integer> map = new HashMap();
            for (int i = 0; i < 1000000; i++) {
                Integer integer = RandomUtil.randomItem(new Integer[]{10, 30, 50});
                if(map.containsKey(integer)){
                    map.put(integer,map.get(integer)+1);
                }else{
                    map.put(integer,1);
                }
            }
            int count = map.get(10)+map.get(30)+map.get(50);
            String str = "10/30/50 ="+map.get(10)+":"+map.get(30)+":"+map.get(50)
                    +"("+count+")";
            System.out.println(str);
        }
    }
    @Test
    public void testRandomItem1(){
        for (int j = 0; j < 10; j++) {
            Map<Integer,Integer> map = new HashMap();
            for (int i = 0; i < 1000000; i++) {
                double[] percentum = new double[]{0.6,0.3,0.1};
                Integer integer = RandomUtil.randomItem(new Integer[]{10, 30, 50}, percentum);
                if(map.containsKey(integer)){
                    map.put(integer,map.get(integer)+1);
                }else{
                    map.put(integer,1);
                }
            }
            int count = map.get(10)+map.get(30)+map.get(50);
            String str = "10/30/50 ="+map.get(10)+":"+map.get(30)+":"+map.get(50)
                    +"("+count+")";
            System.out.println(str);
        }
    }

}