package MR_9_12;
import java.io.*;
import java.util.Random;;
public class MakeDataTest {
public static void main(String[] args){
String filepath = "src\\data";
filepath +="\\1.txt";
System.out.println(filepath);
try {
File file = new File(filepath);
if(!file.exists())
{
file.createNewFile();
System.out.println("data.txt创建完成");
}
FileWriter fw = new FileWriter(file);
BufferedWriter bw = new BufferedWriter(fw);
//产生随机数据,写入文件
Random random = new Random();
for(int i=0;i<5000000;i++)
{
int randint = (int)Math.floor((random.nextDouble()*100.0));
if(i==0)
bw.write(String.valueOf(randint)); //写入一个随机数
else
bw.write(","+String.valueOf(randint));
//bw.newline() //新的一行
}
bw.close();
fw.close();
} catch (Exception e) {
e.printStackTrace();
}
// TODO: handle exception
}
}
Java在0-100的范围内生成随机整数
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转载自blog.csdn.net/qq_45750230/article/details/108572763
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