Java面向对象之泛型
作者:互联网
主要介绍:
- 认识泛型
- 构造方法中使用泛型
- 设置多个泛型
- 通配符
- 泛型接口
- 泛型方法
- 泛型数组
一、认识泛型
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 认识泛型 6 * version: 1.0 7 */ 8 public class GenericDemo01 { 9 public static void main(String[] args) {10 Pointp = new Point<>();11 p.setX(0);12 p.setY(12);13 int px = p.getX();14 int py = p.getY();15 16 System.out.println("px = " + px +" py = " + py);17 }18 19 static class Point {20 private T x;21 private T y;22 23 public T getX() {24 return x;25 }26 27 public void setX(T x) {28 this.x = x;29 }30 31 public T getY() {32 return y;33 }34 35 public void setY(T y) {36 this.y = y;37 }38 }39 }
运行结果:
二、构造方法中使用泛型
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 构造方法中使用泛型 6 * version: 1.0 7 */ 8 public class GenericDemo02 { 9 public static void main(String[] args) {10 Concon = new Con<>("构造方法中使用泛型 huolongluo");11 System.out.println(con.getValue());12 }13 14 static class Con {15 private T value;16 17 public Con(T value) {18 this.value = value;19 }20 21 public T getValue() {22 return value;23 }24 25 public void setValue(T value) {26 this.value = value;27 }28 }29 }
运行结果:
三、指定多个泛型
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 指定多个泛型 6 * version: 1.0 7 */ 8 public class GenericDemo03 { 9 public static void main(String[] args) {10 Gengen = new Gen<>();11 gen.setKey("火龙裸");12 gen.setTake(200);13 System.out.println(gen.getKey() + " " + gen.getTake());14 }15 16 static class Gen {17 private K key;18 private T take;19 20 public K getKey() {21 return key;22 }23 24 public void setKey(K key) {25 this.key = key;26 }27 28 public T getTake() {29 return take;30 }31 32 public void setTake(T take) {33 this.take = take;34 }35 }36 }
运行结果:
四、通配符
通配符比较简单,直接通过实例进行展示:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 通配符 : ? 6 * version: 1.0 7 */ 8 public class GenericDemo04 { 9 public static void main(String[] args) {10 Infoinfo = new Info<>();11 info.setKey("我是火龙裸");12 tell(info);13 }14 15 /**16 * 通配符 : ?17 * */18 public static void tell(Info i) {19 System.out.println("打印:" + i);20 }21 22 static class Info {23 private T key;24 25 public T getKey() {26 return key;27 }28 29 public void setKey(T key) {30 this.key = key;31 }32 33 @Override34 public String toString() {35 return "Info{" +36 "key=" + key +37 '}';38 }39 }40 }
运行结果:
五、泛型在接口当中使用
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 泛型在接口当中的使用 6 * version: 1.0 7 */ 8 public class GenericDemo05 { 9 public static void main(String[] args) {10 Gin gin = new Gin("我是火龙裸");11 System.out.println(gin.getInfo());12 }13 14 interface GenInter {15 void say();16 }17 18 static class Ginimplements GenInter {19 private T info;20 21 public Gin(T info) {22 this.info = info;23 }24 25 public T getInfo() {26 return info;27 }28 29 public void setInfo(T info) {30 this.info = info;31 }32 33 @Override34 public void say() {35 36 }37 }38 }
运行结果:
六、泛型方法
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 泛型方法 6 * version: 1.0 7 */ 8 public class GenericDemo06 { 9 public static void main(String[] args) {10 Gener gener = new Gener();11 12 String str = gener.tell("我是huolongluo");13 System.out.println(str);14 15 int i = gener.tell(1200);16 System.out.println(i);17 }18 19 static class Gener {20 public T tell(T t) {21 return t;22 }23 }24 }
运行结果:
七、泛型数组
泛型数组的使用,其实跟泛型犯法,是要相搭配来使用的。
具体实例如下:
1 package com.huolongluo.newfeatures; 2 3 /** 4 * Created by 火龙裸 on 2019/7/5. 5 * desc : 泛型数组 6 * version: 1.0 7 */ 8 public class GenericDemo07 { 9 public static void main(String[] args) {10 String arr0[] = {"www", "huolongluo", "com"};11 tell(arr0);12 13 Integer arr1[] = {1, 2, 3, 4};14 tell(arr1);15 }16 17 static void tell(T arr[]) {18 for (int i = 0; i < arr.length; i++) {19 System.out.println(arr[i]);20 }21 }22 }
运行结果:
OK,一气呵成。程序员,抛砖引玉很重要。
标签:Java,泛型,void,class,面向对象,static,key,之泛,public 来源: https://blog.51cto.com/u_15255090/2856270