我正在學習Java并嘗試一些東西。我希望能夠打印學生的姓名及其課程和成績。我已經編寫了以下課程來實現這一目標，但是由于我是新手，所以我想知道自己是否正確地做到了。該代碼確實顯示了我想要的內容，但是如何最好地對其進行優化？Subject 班級：public class Subject { private String subjName; private int subjGrade; public Subject(String subjName, int subjGrade) { this.subjName = subjName; this.subjGrade = subjGrade; } public void setName(String name) { this.subjName = name; } public String getName() { return subjName; } public int getGrade(){ return subjGrade; } @Override public String toString() { return String.format( getName() + ", Grade:" + getGrade()); }}StudentSubJGrade 班級：import javax.swing.text.html.HTMLDocument;import java.util.ArrayList;import java.util.Arrays;import java.util.Iterator;public class StudentSubJGrade { String name; Subject[] subjects; public String getName() { return name; } public void setName(String name) { this.name = name; } public void setSubjects(Subject[] subjects) { this.subjects = subjects; } public StudentSubJGrade(String name, Subject[] subjects) { this.name = name; this.subjects = subjects; } @Override public String toString() { return String.format("Name:" + getName() + " Subjects:" + Arrays.toString(subjects)); }}我覺得我可以通過ArrayList添加主題，但經過數小時的嘗試后卻無法提出如何做。不用像我一樣使用數組怎么辦？
2 回答
ibeautiful
TA貢獻1993條經驗 獲得超6個贊
您必須使用數組，因為StudentSubJGrade構造函數希望第二個參數是Subject[]。但是，您可以簡化數組的創建：
import java.util.ArrayList;
public class StudentSubjGradeDriver {
public static void main(String[] args) {
ArrayList<StudentSubJGrade> test = new ArrayList<>();
ArrayList<StudentSubJGrade> test2 = new ArrayList<>();
Subject[] subjects = new Subject[] {
new Subject("Maths",80),
new Subject("Physic",90),
new Subject("Chemistry",70)
};
Subject[] subjects1 = new Subject[] {
new Subject("Maths",80),
new Subject("Physic",90),
new Subject("Chemistry",70),
new Subject("Geography",90)
};
test.add(new StudentSubJGrade("Hassan",subjects));
test2.add(new StudentSubJGrade("James",subjects1));
System.out.println(test);
System.out.println(test2);
}
}
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