JavaSE-15.3.2【泛型类】

package day6.lesson3.p2;

/*
3.2 泛型类

    格式：
        修饰符 class 类名<类型> { }

 */
public class GenericDemo {
    public static void main(String[] args) {
        Student s = new Student();
        s.setName("tom");
        System.out.println(s.getName());

        Teacher t = new Teacher();
        t.setAge(30); //自动装箱
//        t.setAge("30"); //编译异常
        System.out.println(t.getAge());

        System.out.println();

        Generic<String> g1 = new Generic<>();
        g1.setT("tom");
        System.out.println(g1.getT());

        Generic<Integer> g2 = new Generic<>();
        g2.setT(30);
        System.out.println(g2.getT());
    }
}

package day6.lesson3.p2;

public class Generic<T> {

    private T t;

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

    public T getT() {
        return t;
    }
}

package day6.lesson3.p2;

public class Student {

    private String name;

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

package day6.lesson3.p2;

public class Teacher {

    private Integer age;

    public void setAge(Integer age) {
        this.age = age;
    }

    public Integer getAge() {
        return age;
    }
}