為什么testSetContains里面的student不進(jìn)行實(shí)例話創(chuàng)建一個(gè)對象呢?而是直接使用student.courses.contains
public
?void
?testSetContains()?{
????????
//提示輸入課程名稱
????????
System.out.println(
"請輸入學(xué)生已選的課程名稱:"
);
????????
Scanner?scan?=?
new
?Scanner(System.in);
????????
String?name?=?scan.next();
????????
//創(chuàng)建一個(gè)新的課程對象,ID和名稱,與course對象完全一致
????????????????
Course?course2?=?
new
?Course();
????????????????
course2.name?=?name;
????????????????
System.out.println(
"新創(chuàng)建課程:"
+course2.name);
????????????????
System.out.println(
"備選課程中是否包含課程:"
+course2.name+
","
+
????????????????????????
student.courses.contains(course2));//這里
2019-08-09
因?yàn)槟闶窃赾reateStudentAndSelectCours()方法里對學(xué)生選課的,在testSetContains()方法里再實(shí)例化一個(gè)對象出來,也不是選了課的那個(gè),除非你想辦法比如用返回值傳參數(shù)之類的再傳入testSetContains()方法,而將student變?yōu)閷傩跃涂梢灾苯釉赾reateStudentAndSelectCours()方法和testSetContains()方法都能訪問student屬性,而且是同一個(gè)student