java分解质因数，java质因数,应用java语句来分解一

java分解质因数，java质因数,应用java语句来分解一

应用java语句来分解一个整数的质因数

java.util.Scanner sc = new java.util.Scanner(System.in);String s = sc.nextLine();int num;try{    num = Integer.parseInt(s);}catch(NumberFormatException e){    num = -1;}if(num < 1){    System.out.print("input number is wrong");    return;}StringBuffer sb = new StringBuffer();sb.append(num + " = ");while(true){    if(num < 2) break;    boolean flag = false;    for(int i = 2; i < num; i++){        if(num % i == 0){            sb.append(i + " * ");            flag = true;            num = num / i;            break;        }    }    if(!flag) break;}sb.append(num);System.out.print(sb.toString());