Java學習泛型之泛型類

泛型類

泛型類的定義格式：

package com.itheima_95;

public class Generic<T> {
    private T t;

    public T getT() {
        return t;
    }

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

package com.itheima_95;
/*
  測試類
 */
public class GenericDemo {
    public static void main(String[] args) {
        Student s = new Student();
        s.setName("林青霞");
        System.out.println(s.getName());

        Teacher t = new Teacher();
        t.setAge(30);
       // t.setAge("30");
        System.out.println(t.getAge());
        System.out.println("--------");
        Generic<String> g1 = new Generic<String>();
        g1.setT("林青霞");
        System.out.println(g1.getT());
        Generic<Integer>  g2 = new Generic<Integer>();
        g2.setT(30);
        System.out.println(g2.getT());
        Generic<Boolean> g3 = new Generic<Boolean>();
        g3.setT(true);
        System.out.println(g3.getT());

    }
}      

package com.itheima_95;

public class Student {
    private String name;

    public String getName() {
        return name;
    }

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

package com.itheima_95;

public class Teacher {
    private Integer age;

    public Integer getAge() {
        return age;
    }

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