hasNextInt不解决线程"main“java.util.NoSuchElementException中的异常

Question

import java.io.*;

import java.util.Scanner;

public class TestClass {

     public static void main(String[] args) { 

      int t;
      Scanner ip = new Scanner(System.in);
      ScoreCalculation ob = new ScoreCalculation();
      t=ip.nextInt();
      ob.score(t); }
}

class ScoreCalculation {

  void score(int t)
  {  

    Scanner ipu=new Scanner(System.in);
    int i,cum1=0,cum2=0,lead1=0,lead2=0,one,two;
     for(i=1;i<=t;i++)
    {
       //if(ipu.hasNextInt())
       one=ipu.nextInt();
       //if(ipu.hasNextInt())
       two=ipu.nextInt();
       cum1+=one;
       cum2+=two;
       if(cum1>cum2)
       {
          if(lead1<(cum1-cum2))
          lead1=(cum1-cum2);

       }
       else
       {
       if(lead2<(cum2-cum1))
          lead2=(cum2-cum1); 
       }
    }
    if(lead1>lead2)
    System.out.println("1 "+lead1);
    else
    System.out.println("2 "+lead2);

  }
}

以下是我的代码，当我转换为hasNextInt时，它仍然显示错误TestClass名称和使用两个类是必须的

错误是

Exception in thread "main" java.util.NoSuchElementException

    at java.util.Scanner.throwFor(Scanner.java:862)

    at java.util.Scanner.next(Scanner.java:1485)

    at java.util.Scanner.nextInt(Scanner.java:2117)

    at java.util.Scanner.nextInt(Scanner.java:2076)

    at ScoreCalculation.score(TestClass.java:20)

    at TestClass.main(TestClass.java:9)

hasint的错误

TestClass.java:20: error: incompatible types: boolean cannot be converted to int

       one=ipu.hasNextInt();

                         ^

TestClass.java:22: error: incompatible types: boolean cannot be converted to int

       two=ipu.hasNextInt();

Answer 1

首先，hasNextInt()返回一个布尔对象，所以您不能将其转换为Int，这在c++中是允许的，但在java中是不允许的。

其次，您是否跟踪了for循环？我认为它会在第二个循环中崩溃，因为你读取了循环之外的扫描仪。如果t参数大于1，它应该会崩溃，因为一旦没有更多的int可读，它就会读取。