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public static void UpdateStudent(ArrayList<Student> arr) {
System.out.println("输入你要修改的学生学号");
Scanner sc = new Scanner(System.in);
String id = sc.nextLine();
for (int x = 0; x < arr.size(); x++) {
Student s = arr.get(x);
if (s.getId().equals(id)) {
System.out.println("请输入姓名:");
String name = sc.nextLine();
System.out.println("请输入年龄:");
String age = sc.nextLine();
System.out.println("请输入居住地:");
String address = sc.nextLine();
s.setId(id);
s.setName(name);
s.setAge(age);
s.setAddress(address);
arr.set(x, s);
return;
}
}
System.out.println("学号不存在");
}
[/quote] 感谢,看了你说的之后知道逻辑错误在哪里了。太感谢了public static void UpdateStudent(ArrayList<Student> arr) {
System.out.println("输入你要修改的学生学号");
Scanner sc = new Scanner(System.in);
String id = sc.nextLine();
for (int x = 0; x < arr.size(); x++) {
Student s = arr.get(x);
if (s.getId().equals(id)) {
System.out.println("请输入姓名:");
String name = sc.nextLine();
System.out.println("请输入年龄:");
String age = sc.nextLine();
System.out.println("请输入居住地:");
String address = sc.nextLine();
s.setId(id);
s.setName(name);
s.setAge(age);
s.setAddress(address);
arr.set(x, s);
return;
}
}
System.out.println("学号不存在");
}