Question

当我尝试运行程序时，这就是计算机返回的内容：

First_Name Last_Name Test1 Test2 Test3 Test4 Test5平均成绩

线程中的异常＆＃34; main＆＃34; java.lang.NullPointerException at   tests.Tests.main（Tests.java:132）C：\ Users \ Michael   Jr \ AppData \ Local \ NetBeans \ Cache \ 8.1 \ executor-snippets \ run.xml：53：Java   返回：1 BUILD FAILED（总时间：0秒）

# -*- coding: utf-8 -*-
from robot.libraries.BuiltIn import BuiltIn


class global_hooks(object):
    """
        Global scope library listener 
        as global hook mechanism.
    """

    ROBOT_LISTENER_API_VERSION = 3
    ROBOT_LIBRARY_SCOPE = "GLOBAL"

    def __init__(self):
        self.ROBOT_LIBRARY_LISTENER = self

    def __log_variables(self):
        """
            Example private function. 
        """
        if BuiltIn().get_variable_value(name='${SOME_VAR}', default=False):
            BuiltIn().run_keyword(name=self.log_test_variables.__name__)

    def end_test(self, data, result):
        """ The `end test` hook """

        self.__log_variables()

    def log_test_variables(self):
        """
            Keyword for showing up all variables in the test context.
        """

        BuiltIn().log_variables(level='INFO')

Answer 1

您应该检查您的阅读功能的结果：

public static void main(String[] a)
    {
        ArrayList<Tests> ar=read("E:/score.txt");
        if (ar != null){  
            System.out.println("First_Name\tLast_Name\tTest1\t\tTest2\t\tTest3\t\tTest4 \t\tTest5\t\tAverage\t\tGrade");
            for(Tests e:ar)
            {
                System.out.println(e);
            }
        } else {
            System.out.println("Could not read file");
        }
    }

Answer 2

你在验证try语句吗？，read函数返回'Null'值。我认为这个问题出在您阅读文件时。

String sCurrentLine;
        ArrayList<Tests> ar=new ArrayList<Tests>();
        br = new BufferedReader(new FileReader("C:\\Users\\Michael Jr\\Desktop\\ch9_Ex13Data.txt"));

        while ((sCurrentLine = br.readLine()) != null) 
        {
            ar.add(new Tests(sCurrentLine));
        }
        return ar;

如果您能够共享该文件，我将验证此代码是正确的！

我无法让我的程序进行测试：＆＃34; java.lang.NullPointerException＆＃34;

2 个答案: