java - 不兼容的类型泛型 Java

Question

我做了这段代码:

import java.util.LinkedList;

public class Node<T> {
private T data;
private LinkedList<T> children;
public Node(T data) {
    this.data = data;
    this.children = new LinkedList<T>();
}
public T getData() {
    return this.data;
}
public LinkedList<T> getChildren(){
    return this.children;
}
}


public class Graph <T> implements Network<T> {
private Node source;
private Node target;
private ArrayList<Node> nodes = new ArrayList<Node>();


public Graph(T source,T target) {
    this.source = new Node(source);
    this.target = new Node(target);


}


public T source() {
    return source.getData();
}

public T target() {
    return target.getData();
}

我在 source() 和 target() 上收到此错误:required T found java.lang.Object 为什么？ getData()函数的返回类型是T(generic type of return)

Answer 1

private Node source;
private Node target;

这些应该是Node<T> .同样在以下几行中。编译器会给你一个警告。注意它。 (当您混合原始类型和泛型时，Java 语言规范通常要求编译器放弃。)