Java实现整数分解质因数的方法示例

import java.util.Scanner;public class Main {  public static boolean isPrime(int i)  {    boolean isPrime = true;    //除到i的平方根就可以判断    for (int j = 2; j<=Math.sqrt(i);j++)    {      if(i%j==0)        isPrime = false;    }    return isPrime;  }  public static void main(String[] args) {    // TODO Auto-generated method stub    System.out.println("编程网 - 分解质因数测试：");    Scanner in = new Scanner(System.in);    int n = in.nextInt();    String out = n + "=";    if(isPrime(n))    {      out = out+ n;    }    else    {      while(n!=1)      {        for(int j=2;j<=n;j++)        {          //对最后一个进行特殊处理          if(j==n)          {            n=1;            out = out + j;            break;          }          if(n%j==0)          {            n=n/j;            out = out + j+"x";            break;          }        }      }    }    System.out.println(out);    in.close();  }}