java - 我的程序在 while 循环之后不会执行任何内容

Question

我写了这个“计算器”，我希望它在计算后输出结果，但由于某种原因它不会输出!!
示例输入为
2
1 + 1 * 2 =

输出将是4

提前致谢

import java.util.Scanner;


public class Main {

/**
 * @param args
 */
public static void main(String[] args) {
    Scanner input=new Scanner(System.in);
    int n=input.nextInt();
    for (int i=0;i<n;i++){
        int result=input.nextInt();
        String operand=input.next();
        int flag=0;
        while (flag==0){
            int temp=input.nextInt();
            if (operand.equals("*"))
                result*=temp;
            else if (operand.equals("/"))
                result/=temp;
            else if (operand.equals("+"))
                result+=temp;
            else if (operand.equals("-"))
                result-=temp;
            else if (operand.equals("=")){
                flag=1;
                System.out.println(result);
            }
            operand=input.next();
        }
    }

}

  }

public class Main 
{
    public static void main(String[] args) 
    {
         Scanner input=new Scanner(System.in);
         int n=input.nextInt();
         for (int i=0;i<n;i++)
         {
             int result=input.nextInt();
             String operand=input.next();
             int flag=0;
             while (flag==0)
             {
                 int temp=input.nextInt();
                 if (operand.equals("*"))
                     result*=temp;
                 else if (operand.equals("/"))
                     result/=temp;
                 else if (operand.equals("+"))
                     result+=temp;
                 else if (operand.equals("-"))
                     result-=temp;
                 else if (operand.equals("="))
                 {
                     flag=1;
                     System.out.println(result);
                 }
            operand=input.next();
            }
        }
    }
}

Answer 1

控件正在等待下一行的输入

    while (flag==0){
        int temp=input.nextInt(); <- its waiting for input after you enter =