Java:如何检查泛型类的定义？

public class MyGenericClass<T> {
    private T data;

    public MyGenericClass(T data) {
        this.data = data;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

MyGenericClass<String> stringInstance = new MyGenericClass<>("Hello, World!");
MyGenericClass<Integer> integerInstance = new MyGenericClass<>(123);

System.out.println(stringInstance.getData()); // 输出 "Hello, World!"
System.out.println(integerInstance.getData()); // 输出 123

public class MySubGenericClass<T> extends MyGenericClass<T> {
    public MySubGenericClass(T data) {
        super(data);
    }
}

MyGenericClass<?> genericInstance = new MyGenericClass<>("Wildcard");

public class MyMultiGenericClass<K, V> {
    private K key;
    private V value;

    public MyMultiGenericClass(K key, V value) {
        this.key = key;
        this.value = value;
    }

    public K getKey() {
        return key;
    }

    public void setKey(K key) {
        this.key = key;
    }

    public V getValue() {
        return value;
    }

    public void setValue(V value) {
        this.value = value;
    }
}

public class MyRestrictedGenericClass<T extends Number> {
    private T data;

    public MyRestrictedGenericClass(T data) {
        this.data = data;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}