java之泛型的使用

public class Test<T> {
    private T a;

    public Test(T a) {
        this.a = a;
    }

    public T getA() {
        return a;
    }

    public void setA(T a) {
        this.a = a;
    }

    public static void main(String[] args) {
        Test<String> test = new Test<>("test");
        System.out.println(test.getA());
    }
}