[英]class error in java (error: can't find main(String[]) method in class: student)
我实际上正在尝试执行一些基本的 Java 操作,但出现了令人困惑的错误:
import java.util.Scanner;
class Student {
String name, gender;
int roll;
int mark1, mark2, mark3;
void print() {
System.out.println("Name: " + name);
System.out.println("Roll: " + roll);
System.out.println("Gender: " + gender);
}
}
class MarkStudents extends Student {
void printData() {
int total = mark1 + mark2 + mark3;
System.out.println("Marks\nMaths; " + mark1 + "\nChemistry: " + mark2 + "\nComputer: " + mark3 + "\nTotal: " + total + "\nGrade: ");
if (total >= 90)
System.out.print("A");
else if (total >= 80 && total < 90)
System.out.print("B");
else if (total >= 70 && total < 80)
System.out.print("C");
else if (total >= 60 && total < 70)
System.out.print("D");
else if (total >= 50 && total < 60)
System.out.print("E");
else
System.out.print("F");
}
}
class StudentDataInheritance {
public static void main(String[] args) {
//create scanner function
Scanner sc = new Scanner(System.in);
// Read student details
System.out.println("Enter the Student details\nName: ");
String name = sc.nextLine();
System.out.println("Roll no: ");
int roll = sc.nextInt();
System.out.println("Enter the gender: ");
String gender = sc.nextLine();
System.out.println("Mark1: ");
int m1 = sc.nextInt();
System.out.println("Mark2: ");
int m2 = sc.nextInt();
System.out.println("Mark3: ");
int m3 = sc.nextInt();
MarkStudents m = new MarkStudents();
m.name = name;
m.roll = roll;
m.gender = gender;
m.mark1 = m1;
m.mark2 = m2;
m.mark3 = m3;
m.print(); // print from p=super class
m.printdata(); // print from extended
}
}
当我尝试运行此代码时:
java StudentDataInheritance.java
error: can't find main(String[]) method in class: Student
但即使我用String[] args
创建一个 Java class ,它也会弹出一个错误!
我看到您的文件名称是 student.java。 并且,您的主要方法存在于 Student_data_inheritance class 中,它不是公开的(即它不是主类)。 将你的main方法移动到学生class,因为它只在Main class中寻找main方法。
我只是通过更改文件名和 class 名称解决了这个问题,但我仍然不知道是什么原因导致了这个问题
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