Java泛型绑定的类型和类型参数

// 定义一个泛型类
public class Box<T> {
    private T t;

    public void set(T t) {
        this.t = t;
    }

    public T get() {
        return t;
    }
}

// 使用泛型类
Box<Integer> integerBox = new Box<>();
integerBox.set(new Integer(10));
System.out.printf("Integer Value :%d\n\n", integerBox.get());

Box<String> stringBox = new Box<>();
stringBox.set(new String("Hello World"));
System.out.printf("String Value :%s\n", stringBox.get());

public class GenericClass<T> {
    private Class<T> type;

    public GenericClass(Class<T> type) {
        this.type = type;
    }

    public T createInstance() throws InstantiationException, IllegalAccessException {
        return type.newInstance();
    }
}

// 使用示例
GenericClass<String> gc = new GenericClass<>(String.class);
String s = gc.createInstance();