泛型的扩展与继承

一、泛型的扩展

1、先定义一个父类

public class Parent<T1, T2>
{
    private T1 foo1;
    
    private T2 foo2;

    public T1 getFoo1()
    {
        return foo1;
    }

    public void setFoo1(T1 foo1)
    {
        this.foo1 = foo1;
    }

    public T2 getFoo2()
    {
        return foo2;
    }

    public void setFoo2(T2 foo2)
    {
        this.foo2 = foo2;
    }   
}

2、子类扩展父类，并增加一个泛型

public class Child<T1, T2, T3> extends Parent<T1, T2>
{
    private T3 foo3;

    public T3 getFoo3()
    {
        return foo3;
    }

    public void setFoo3(T3 foo3)
    {
        this.foo3 = foo3;
    }   
}

二、 泛型的继承

1、先定义一个接口

public interface ParentInterface<T1, T2>
{
    public void setFoo1(T1 t1);
    
    public void setFoo2(T2 t2);
    
    public T1 getFoo1();
    
    public T2 getFoo2();
}

2、子类继承父接口

public class ChildClass<T1, T2> implements ParentInterface<T1, T2>
{
    private T1 foo1;
    
    private T2 foo2;

    /**
     * 实现接口中的四个方法
     */
    @Override
    public void setFoo1(T1 t1)
    {
        this.foo1 = t1;
    }

    @Override
    public void setFoo2(T2 t2)
    {
        this.foo2 = t2;
        
    }

    @Override
    public T1 getFoo1()
    {
        return this.foo1;
    }

    @Override
    public T2 getFoo2()
    {
        return this.foo2;
    }

}

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