Question

我有2个不同的Java文件 Mark.java

public class Mark
//class'name has to be the same with file's name
{
private String studentName;
private int studentMark;
//studentName and studentMark are private instance variables
//which cannot be accessed by other classes

public Mark() //a default constructor
{studentName = "unknown"; studentMark = 0;} //giving a starting value
public Mark(String n, int m) //a parameterised constructor
{studentName = n; studentMark = m;}

//2 set mthods
public void setname (String n)
{studentName = n;}
public void setmark (int m)
{studentMark = m;}

//2 get methods
public String getname()
{return studentName;}
public int getmark()
{return studentMark;}


//get Grade method
public String Grade;
//"final" means constant
final int PASS = 50;
final int CREDIT = 65;
final int DISTINCTION = 75;
final int highDISTINCTION = 85;

{
    //if statement
    if (studentMark < PASS)
        Grade = "F";
    else if (studentMark < CREDIT)
        Grade="P";
    else if (studentMark < DISTINCTION)
        Grade="C";
    else if (studentMark < highDISTINCTION)
        Grade="D";
    else
        Grade="HD";
}

public void setGrade (String g) {Grade = g;}
public String getGrade() {return Grade;}
}

和GUI.java

import javax.swing.*; //to run JFrame
import java.awt.*; //to run FlowLayout
import java.awt.event.*; //to run ActionListener
import javax.util.*;
public class MarksGUI extends JFrame implements ActionListener
{
//declare class instance variables
String studentName = nameField.getText();
int studentMark = Integer.parseInt(markField.getText());
final int MAX_STUDENT = 10;
//declare maximum student constant
private Mark [] markArray = new Mark[MAX_STUDENT];
//declare current student variable
private int currentStudent = 0; //to count the numbers of students from 0 to 9
markArray[currentStudent] = new Mark (studentName, studentMark);

   private void enterStudentNameAndMark()
    {

    }

目前我正试图找到一种方法，以便通过mark.java处理名称和标记输入数据并存储在数组中，这将是最有效的方法＆gt;

Answer 1

如果我的问题正确，您可以在调用参数化构造函数后立即调用该方法。

当您调用数组中的构造函数时，将生成Grade。

或者你可以在actionPerformed方法中调用构造函数。

Answer 2

首先，移动你的＆＃34; if语句＆＃34;进入构造函数或另一个private方法并将其添加到构造函数中。

注意： 不要public，因为您将在构造函数中将其用作成绩初始化方法

private void updateGrade(int studentMark){
    if (studentMark < PASS)
       Grade = "F";
    else if (studentMark < CREDIT)
       Grade="P";
    else if (studentMark < DISTINCTION)
       Grade="C";
   else if (studentMark < highDISTINCTION)
      Grade="D";
   else
      Grade="HD";

}

不要忘记在二传手中更新成绩。

public void setmark (int m){
    studentMark = m;
    updateGrade(m);
}

使用不同的.java文件

2 个答案: