泛型类、多参数泛型类、泛型接口（2）、静态非静态泛型函数、泛型绑定类

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转自 harvic慢跑的乌龟 http://blog.csdn.net/harvic880925/article/details/49872903

Point

package com.example.genericdemo;/** * 1、泛型类 你传进去的是什么，T就代表什么类型 */class Point<T> {// 此处可以随便写标识符号private T x;private T y;public void setX(T x) {// 作为参数this.x = x;}public void setY(T y) {this.y = y;}public T getX() {// 作为返回值return this.x;}public T getY() {return this.y;}}/** * 2、多参数泛型类 */class MorePoint<T, U> {private T x;private U name;public void setX(T x) {this.x = x;}public T getX() {return this.x;}public void setName(U name) {this.name = name;}public U getName() {return this.name;}}/** * 3、1泛型接口 */interface Info<T> { // 在接口上定义泛型public T getVar(); // 定义抽象方法，抽象方法的返回值就是泛型类型public void setVar(T var);}class InfoImpl<T> implements Info<T> { // 定义泛型接口的子类private T var; // 定义属性public InfoImpl(T var) { // 通过构造方法设置属性内容this.setVar(var);}public void setVar(T var) {this.var = var;}public T getVar() {return this.var;}}/** * 3、2泛型接口 */class InfoImpl1 implements Info<String> { // 定义泛型接口的子类private String var; // 定义属性public InfoImpl1(String var) { // 通过构造方法设置属性内容this.setVar(var);}@Overridepublic void setVar(String var) {this.var = var;}@Overridepublic String getVar() {return this.var;}}

Fruit

package com.example.genericdemo;/** * 4.3泛型绑定类 就可以限定填充的变量必须派生自Fruit的子类 *  */class Fruit {private String name;public String getName() {return name;}public void setName(String name) {this.name = name;}}class Banana extends Fruit {public Banana() {setName("bababa");}}class Apple extends Fruit {public Apple() {setName("apple");}}

MainActivity

package com.example.genericdemo;import android.app.Activity;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/** * 1、泛型类 */Point<Integer> p = new Point<Integer>();p.setX(new Integer(100));Log.e("TAG", "p.getX()==" + p.getX());/** * 2、多参数泛型类 */MorePoint<Integer, String> morePoint = new MorePoint<Integer, String>();morePoint.setName("harvic");morePoint.setX(new Integer(100));Log.e("TAG", "morPont.getName==" + morePoint.getName()+ ",morePoint.getX()==" + morePoint.getX());/** * 3、1泛型接口 */InfoImpl<String> i = new InfoImpl<String>("asffafsfgg");System.out.println(i.getVar());Log.e("TAG", "" + i.getVar());/** * 3.2泛型接口 */InfoImpl1 i1 = new InfoImpl1("sfasfa");Log.e("TAG", "" + i1.getVar());/** * 4.1静态泛型函数,返回值前加上<T>来表示泛型变量 函数里所有用到的T类型也就是强制指定了是String类型 */MainActivity.<String> StaticMethod("AAAAA");MainActivity.StaticMethod("AAAAA");/** * 4.2非静态泛型函数 */MainActivity.this.<Integer> OtherMethod(new Integer(123));MainActivity.this.OtherMethod(new Integer(123));/** * 4.3泛型绑定类 就可以限定填充的变量必须派生自Fruit的子类 */String name_1 = getFruitName(new Banana());String name_2 = getFruitName(new Apple());Log.e("TAG", name_1);Log.e("TAG", name_2);}public static <T extends Fruit> String getFruitName(T t) {return t.getName();}public static <T> void StaticMethod(T a) {Log.e("TAG", "StaticMethod: " + a.toString());}public <T> void OtherMethod(T a) {Log.e("TAG", "OtherMethod: " + a.toString());}}

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