通过引用替换列表中的对象

import java.util.ArrayList;

public class ByReference {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    ArrayList emps = new ArrayList();

    // create employee objects
    Employee emp1 = new Employee("A");
    Employee emp2 = new Employee("T");
    Employee emp3 = new Employee("K");

    // add employee objects to array list
    emps.add(emp1);
    emps.add(emp2);
    emps.add(emp3);

    // print the array list
    System.out.println(emps);

    // remove one of the employees
    emps.remove(emp2);

    // print the array list again
    System.out.println(emps);
}

}
class Employee{
private String name;

  public Employee(String name) {
    this.name = name;
  }
  
  
  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }


  @Override
  public String toString() {
    return "Employee [name=" + name + "]";
  }
  
}

Console：
[Employee [name=A], Employee [name=T], Employee [name=K]]
[Employee [name=A], Employee [name=K]]