JavaFx模型等于总是返回false

Question

我创建了一个应用程序，并且我为ObservableList创建了模型我想调用集合.contains()这个方法需要equals()，但这总是返回false。我只在equals方法中放入一个字段。当我在if语句中比较使用getter方法时，它会像我期望的那样返回true。

import java.util.Objects; 
import javafx.beans.InvalidationListener; 
import javafx.beans.property.SimpleStringProperty; 
import javafx.beans.value.ChangeListener; 
import javafx.beans.value.ObservableValue; 
import javafx.collections.FXCollections; 
import javafx.collections.ObservableList; 
import javafx.scene.image.Image; 

public class Client implements ObservableValue { 

    private final SimpleStringProperty remoteAddress; 
    private final SimpleStringProperty userName; 
    private final boolean connected = true; 
    private final ObservableList<String> logs 
      = FXCollections.observableArrayList(); 
    private final ObservableList<Image> imageLogs 
      = FXCollections.observableArrayList(); 

    public Client(String remoteAddress, String userName) { 
     this.remoteAddress = new SimpleStringProperty(remoteAddress); 
     this.userName = new SimpleStringProperty(userName); 
    } 

    public SimpleStringProperty remoteAddressProperty() { 
     return remoteAddress; 
    } 

    public SimpleStringProperty userNameProperty() { 
     return userName; 
    } 

    public final String getRemoteAddress() { 
     return remoteAddress.get(); 
    } 

    public final void setRemoteAddress(String name) { 
     this.remoteAddress.set(name); 
    } 

    public final String getUserName() { 
     return userName.get(); 
    } 

    public final void setUserName(String name) { 
     this.userName.set(name); 
    } 

    public ObservableList<String> getLogs() { 
     return logs; 
    } 

    public ObservableList<Image> getImageLogs() { 
     return imageLogs; 
    } 

    @Override 
    public boolean equals(Object obj) { 
     if (obj == null || getClass() != obj.getClass()) { 
      return false; 
     } 
     return this.remoteAddress == ((Client) obj).remoteAddress; 
    } 

    @Override 
    public int hashCode() { 
     int hash = 3; 
     hash = 37 * hash + Objects.hashCode(this.remoteAddress); 
     return hash; 
    } 
} 

Answer 1

你需要的属性的实际字符串内容比较：

@Override 
public boolean equals(Object obj) { 
    if (obj == null || getClass() != obj.getClass()) { 
     return false; 
    } 
    return this.remoteAddress.get().equals(((Client) obj).remoteAddress.get()); 
} 

@Override 
public int hashCode() { 
    int hash = 3; 
    hash = 37 * hash + Objects.hashCode(this.remoteAddress.get()); 
    return hash; 
} 

Answer 2

我认为，你不能比较两个对象 “==”，使用等于：

return this.remoteAddress.equals(((Client) obj).remoteAddress);