泛型也可以继承和实现接口
public class Test{
public static void main(String[] args) {
}
}
class Father<T>{
}
interface ARB<E>{
}
class child<T,E> extends Father<T> implements ARB<E>{
}
泛型继承的四种情况
- 全部继承
子类泛型可以比父类多
public class Test{
public static void main(String[] args) {
Father<Integer,String> father = new child<>(1, "2");
child<String,String ,Boolean> child = new child<>("1","2");
}
}
class Father<T1, T2>{
T1 t1;
T2 t2;
public Father(T1 t1,T2 t2){
this.t1 = t1;
this.t2 = t2;
System.out.println(this.t1.getClass());
System.out.println(this.t2.getClass());
}
}
class child<T1, T2, T3> extends Father<T1, T2> {
public child(T1 t1, T2 t2) {
super(t1, t2);
}
}
- 部分继承
同样子类泛型也可以比父类多
public class Test{
public static void main(String[] args) {
Father<Integer,String> father = new child<>(1, "2");
child<String,String ,Boolean> child = new child<>("1","2");
}
}
class Father<T1, T2>{
T1 t1;
T2 t2;
public Father(T1 t1,T2 t2){
this.t1 = t1;
this.t2 = t2;
System.out.println(this.t1.getClass());
System.out.println(this.t2.getClass());
}
}
class child<T1, T2, T3> extends Father<T1,String> {//继承时将父类一个泛型实例化
public child(T1 t1, String t2) {
super(t1, t2);
}
}
实现父类泛型
子类将父类全部实现，子类独有，不再是继承的
public class Test{
public static void main(String[] args) {
child<String,String ,String> child = new child<>(1,"2");
//无论怎么写第一个都是整形，第二个是字符串
}
}
class Father<T1, T2>{
T1 t1;
T2 t2;
public Father(T1 t1,T2 t2){
this.t1 = t1;
this.t2 = t2;
System.out.println(this.t1.getClass());
System.out.println(this.t2.getClass());
}
}
class child<T1, T2, T3> extends Father<Integer,String> {
public child(Integer t1, String t2) {
super(t1, t2);
}
}
不实现父类泛型
父类所有成员默认为Object类型
public class Test{
public static void main(String[] args) {
child<String,String ,String> child = new child<>("1","2");
}
}
class Father<T1, T2>{
T1 t1;
T2 t2;
public Father(T1 t1,T2 t2){
this.t1 = t1;
this.t2 = t2;
System.out.println(this.t1.getClass());
System.out.println(this.t2.getClass());
}
}
class child<T1, T2, T3> extends Father{
public child(Object t1, Object t2) {
super(t1, t2);
// TODO Auto-generated constructor stub
}
}