Java | 基础归纳 | Map.Entry<String, String>

public class Test {
    private static Map<String,String> student;
    
    private static void init() {
        student = new LinkedHashMap<String,String>();
        student.put("16010001", "tom");
        student.put("16010002", "tony");
        student.put("16010003", "j");
        student.put("16010004", "yy");
    }
    
    public static void main(String[] args) {
        init();
         String key = null;
         Scanner stdin = new Scanner(System.in);
         System.out.println("Choose a SchoolId:");
         for(Map.Entry<String, String> stu:student.entrySet()) {
             System.out.println(stu.getKey()+"	" + stu.getValue());
         }
         while(key == null) {
              key = stdin.nextLine();
              if (student.get(key) == null) {
                    System.out.println("Invalid choice!");
                    key = null;
                }
         }
         
         System.out.println("Success!");
    }
}