Question

我一直在youtube上使用从底部的git hub链接提供的源代码示例观看这些视频，一切都很好，但每当我运行代码时我就开始收到这些错误

错误：无法找到或加载主类mathexample.MathExample C：\ Users \ JAC \ AppData \ Local \ NetBeans \ Cache \ 8.2 \ executor-snippets \ run.xml：53：Java返回：1 BUILD FAILED（总时间：0秒）

代码：

package mathexample;

import java.util.Random;
import java.util.Scanner;

public class MathExample {

    public static void main(String[] args) {
        System.out.println("//Math Example //////////////////////////////////");
        // Circle Math
        Scanner input = new Scanner(System.in);
        System.out.print("Enter Circle Radius : ");
        double radius = input.nextDouble();
        double circ = 2*Math.PI*radius;// using math library
        double area = Math.PI*radius*radius;
        System.out.printf("Circumfrence : %f; Area : %f\n",circ, area);   
        System.out.println("///////////////////////////////////////////////\n");

        System.out.println("//RandomExample /////////////////////////////////");
        // Demonstrates use of an existing class
        //random class
        Random generator = new Random();    // 0 is the "seed" the same seed will
                                            // generate the same random sequence
                                            // Random() will use a random "seed"        
        int i = generator.nextInt(10);      // pick a random number between 0 and 9
        System.out.println(i);
        i = generator.nextInt(10);// java doc explains classes right click to access it
        System.out.println(i);
        i = generator.nextInt(10);
        System.out.println(i); 
        System.out.println("///////////////////////////////////////////////\n");

        System.out.println("//StringBuilderExample //////////////////////////");
        // demonstrates StringBuilder class
        StringBuilder sb = new StringBuilder();//uses javadoc the learn
        sb.append("This is a test!");
        String forward = sb.toString();//you only need (new) when creating a new object 
        String reverse = sb.reverse().toString();// this uses the existing object 
        // on line 7 StringBuilder

        System.out.println(forward);
        System.out.println(reverse);
        System.out.println("/////////////////////////////////////////////////");

    }
}

https://github.com/mafudge/LearnJava

Answer 1

它看起来像你正在使用的任何一个IDE，你没有指向你的主类。尝试查看项目设置，看看它正在尝试执行什么。

嗨所以我有一个错误，让我的代码不运行？

1 个答案: