修改ArrayList里面的内容

今天学到了一个方法！分享给大家学习下！public static void main(String [] as){

Student a = new Student(a );

Student b = new Student(b );

Student c = new Student(c );

List<Student> list = new ArrayList<Student>();

listadd(a);

listadd(b);

listadd(c);

Systemoutprintln(未修改前:);

for(Student s: list){

Systemoutprintln(s);

}

asetMark();

listset( a);

Systemoutprintln(已修改后:);

for(Student s: list){

Systemoutprintln(s);

}

}

}

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