int 变量输出未出现在另一个包中答案

【问题标题】：int variable output is not appearing in another packageint 变量输出未出现在另一个包中
【发布时间】：2021-05-08 16:39:16
【问题描述】：

您好，我是一名学习 java 的大一新生，我目前遇到了一些关于包和包导入的问题，因为我来自另一个包的 int 变量没有出现在我导入它的包中。

这是我要导入另一个包的int的包：

package StudentPackage;
import java.text.*;
public class Acadinfo {  
    
DecimalFormat df = new DecimalFormat("##.00");    
 int Studentn1, Studentn2;
 int q11, q12, q21, q22;
 int mt1, mt2;
 int f1, f2;
 int average, average2;

final void Acadinfo()
{
Studentn1 = 2468; Studentn2 = 13579;
q11 = 90; q12 = 90;
q21 = 80; q22 = 80;
mt1 = 100; mt2 = 85;
f1 = 95; f2 = 90;

int addaverage1 = q11 + q12 + mt1 + f1;
average = addaverage1 / 4;

int addaverage2 = q21 + q22 + mt2 + f2;
average2 = addaverage2 / 4;
}
public final void displayEducDetails1()
{    
System.out.println("STUDENT EDUCATIONAL DETAILS");
System.out.println("Student Number: " + Studentn1);
System.out.println("Student Grade Average: " + df.format(average));
System.out.println("Student Attendance: 100%");
}

public final void displayEducDetails2()
{    
System.out.println("STUDENT EDUCATIONAL DETAILS");
System.out.println("Student Number: " + Studentn2);
System.out.println("Student Grade Average: " + df.format(average2));
System.out.println("Student Attendance: 100%");
}

}

这是我希望 int 出现的主包：

package MainPackage;
import StudentPackage.*;
public class MainProgram {
    public static void main(String[] args) {
    Acadinfo ai = new Acadinfo();
    
    ai.displayEducDetails1();
    System.out.println();
    ai.displayEducDetails2();
    }
    
}

但输出显示如下：

STUDENT EDUCATIONAL DETAILS
Student Number: 0
Student Grade Average: .00
Student Attendance: 100%

STUDENT EDUCATIONAL DETAILS
Student Number: 0
Student Grade Average: .00
Student Attendance: 100%

我想知道我哪里出错了，我在这里犯了什么错误。谢谢！

【问题讨论】：

标签： java import package integer println

【解决方案1】：

youngblood 您已将构造函数定义为final void Acadinfo(){}，MainProgram 看不到它，使其成为public Acadinfo()。您不能将返回类型分配给构造函数，因为这会使编译器认为是新方法而不是构造函数。

问题：

final void Acadinfo()
{
Studentn1 = 2468; Studentn2 = 13579;
q11 = 90; q12 = 90;
q21 = 80; q22 = 80;
mt1 = 100; mt2 = 85;
f1 = 95; f2 = 90;

int addaverage1 = q11 + q12 + mt1 + f1;
average = addaverage1 / 4;

int addaverage2 = q21 + q22 + mt2 + f2;
average2 = addaverage2 / 4;
}

解决方案：

public Acadinfo()
{
Studentn1 = 2468; Studentn2 = 13579;
q11 = 90; q12 = 90;
q21 = 80; q22 = 80;
mt1 = 100; mt2 = 85;
f1 = 95; f2 = 90;

int addaverage1 = q11 + q12 + mt1 + f1;
average = addaverage1 / 4;

int addaverage2 = q21 + q22 + mt2 + f2;
average2 = addaverage2 / 4;
}

【讨论】：