如何在Java中使用equals()方法实现重写

 class User {    public void setName(String name) {  this.name = name;  }    public String getName() {   return name;  }    public boolean equals(Object obj) {  if(this == obj) {   return true;  }  if(null == obj) {   return false;  }  if(getClass() != obj.getClass()) {   return false;  }   User user = (User) obj;  if(!name.equals(user.name)) {  return false;  }  return true; }  private String name; }  public class EqualsDemo {  public static void main(String[] args) {  User userA = new User();  userA.setName("王明");    User userB = new User();  userB.setName("王明");   User userC = new User();  userC.setName("王亮");   System.out.println("userA equals userB:" + userA.equals(userB));  System.out.println("userA equals userC:" + userA.equals(userC));  } }