Question

我创建了一个应用程序，并为ObservableList创建模型我希望调用集合.contains()方法，该方法需要equals()，但这总是返回false。我只在equals方法中放了一个字段。当我在if语句中使用getter方法进行比较时，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

您需要比较属性的实际字符串内容：

@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，你不能用“==”比较两个对象，使用equals：

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

JavaFx模型等于总是返回false

2 个答案: