无法实例化类型（类）？

Question

我过去曾经使用过列表，但遇到了同样的问题。我用this问题来回答。但是，当我创建一个名为Value的新抽象类并以以下方式使用它时：public Value<Boolean> preferSwords = new Value<>("PreferSwords", true);我得到了错误。值类：

package Cupert.util;

import com.google.gson.JsonObject;



import java.util.function.Predicate;



public abstract class Value<T> {

    private String name;

    private T object;

    private T defaultVal;

    /**

     * The validator which is called every time the value is changed

     */

    private Predicate<T> validator;



    Value(String name, T defaultVal, Predicate<T> validator) {

        this.name = name;

        this.object = defaultVal;

        this.defaultVal = defaultVal;

        this.validator = validator;

    }



    public abstract void addToJsonObject(JsonObject obj);



    public abstract void fromJsonObject(JsonObject obj);



    public String getName() {

        return name;

    }



    public T getObject() {

        return object;

    }



    public boolean setObject(T object) {

        if (validator != null && !validator.test(object)) return false;



        this.object = object;



        return true;

    }



    public void setValidator(Predicate<T> validator) {

        this.validator = validator;

    }



    public Object getDefault() {

        return defaultVal;

    }

}