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  • 随机获取用户定义的字符串

    此类需要使用之前讲到的IntegerWeightRandom类;

    示例:

    给定"a"赋予权重100,"b"的权重为50,则getNextString()时取"a"的概率要更大;


    package org.xiazdong.util;
    
    /*给定字符串集合,设定每个字符串的权重,返回随机字符串*/
    public class StringRandom {
    	private String[] datas;
    	private IntegerWeightRandom random = new IntegerWeightRandom();
    	public StringRandom(String[]datas){
    		this.datas = datas;
    	}
    	public void setStringWeight(int weight,int idx){
    		if(datas.length>idx)
    			random.addWeightNumber(weight, idx);
    	}
    	public String getNextString(){
    		int idx = random.getNextInt();
    		return datas[idx];
    	}
    }


    测试类:


    package test.org.xiazdong.util;
    
    import org.junit.Test;
    
    import org.xiazdong.util.StringRandom;
    
    import junit.framework.TestCase;
    
    public class StringRandomTest extends TestCase {
    
    	@Test
    	public void testGetNextString() {
    		StringRandom random = new StringRandom(new String[] { "a", "b", "c" });
    		random.setStringWeight(10, 0);
    		random.setStringWeight(20, 1);
    		random.setStringWeight(30, 2);
    		for (int i = 0; i < 10; i++)
    			System.out.println(random.getNextString());
    	}
    }
    


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  • 原文地址:https://www.cnblogs.com/xiazdong/p/3058335.html
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