java - 如何获取数组列表中以字母 T 开头的名称字符串并显示教师姓名？

Question

如何在数组列表java中获取包含以字母“T”开头的教师姓名的列表。我想显示教师名单。如果教师列表不存在，则会显示“没有教师姓名以字母T开头”。该程序是关于抽象和多态性的。这是我的代码

class teacher 
package Tinhdahinh;
public abstract class Teacher {
//Properties
int code;
String name;

//method

public Teacher() {
}

public Teacher(int code, String name) {
    this.code = code;
    this.name = name;
}

public int getCode() {
    return code;
}

public void setCode(int code) {
    this.code = code;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}
// ham hien thi thong tin

void show(){
    System.out.print(this.getCode() + "\t" + this.getName());
}

//Ham abstract tinh luong
abstract double getSalary();
}

类接口(interface)管理方法

@Override
public void countNameStarByt(ArrayList<Teacher> lst) {
  int count = 0;
  for (Teacher teacher : lst) {
        if(teacher.getName().startsWith("T")){
            count++;
           // teacher.show();
        }
             if(count > 0){
                 System.out.println(count);
                teacher.show(); 
    }
        else{
            System.out.println("No teacher has name starting with letter 
'T'.");
             break;
            }

  }
    //System.out.println("");
}

public class Main {
public static void main(String[] args) {
 Quanly Q = new Quanly();
    ArrayList<Teacher> lst = new ArrayList();
    Q.inputList(lst, 3);
   System.out.println();
    System.out.println("Is there any teachers has name starting with letter 
'T': ");
    Q.countNameStarByt(lst);
}
}

Answer 1

count 的用法是错误的。如果 count 大于零，代码将打印出每个 Teacher 对象，无论其名称是否以 T 开头。如果 count 为零，则即使列表中有有效对象，循环也会终止。

尝试:

@Override
public void countNameStarByt(ArrayList<Teacher> lst) {
   int count = 0;
   for (Teacher teacher: lst) {
      if(teacher.getName().startsWith("T")){
        count++;
        teacher.show();
      } 
   }
   if (count == 0) {
      System.out.println("No teacher has name starting with letter 'T'.");
   }
}