Java-Python对垒之质数计算

Posted 2020-12-09 天涯未抵

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目录

• Java 实现
• Python 实现
• 结论

Java 实现

class PrimeNumber{
	public static void main(String[] args) {
		long start=System.currentTimeMillis();
		int count=0;
		label:for(int i=1;i<=100000;i++){
			for (int j=2;j<=Math.sqrt(i);j++) {
				if(i%j==0){
					continue label; //返回外层循环
				}	
			}
			count++;
			// System.out.println(i);
		}
		long end=System.currentTimeMillis();
		System.out.println("count"+count); //9593
		System.out.println("time(ms)"+(end-start)); //time 14ms
	}

}

Python 实现

import time
import math
def main():
	start=time.time()
	count=0
	for i in range(1,100001):
		isFlag=True
		for j in range(int(math.sqrt(i)),1,-1):
			if i%j==0:
				isFlag=False
				break
		if (isFlag):
			count+=1
	end=time.time()
	print(‘count‘,count) //9593
	print(‘time(ms)‘,(end-start)*1000) //697.28684425354ms

if __name__ == ‘__main__‘:
	main()

结论

Java实现质数计算效率更高，循环处理方式更灵活，Python可读性高，各有各的特点。