1 认识泛型：
案例代码
package csdn.zyl.demo; class Point{ private Object x; private Object y; public Object getX() { return x; } public void setX(Object x) { this.x = x; } public Object getY() { return y; } public void setY(Object y) { this.y = y; } } /* * 经纬度 * int * float * String 类型 */ public class GenericalDemo01 { public static void main(String[] args) { // TODO Auto-generated method stub Point<String> point = new Point<String>(); point.setX("精度为：109"); point.setY("精度为：109"); // Point p = new Point(); // p.setX(10.1f); // p.setY(10.1f); // Float px = (Float)p.getX(); // Float py = (Float)p.getY(); System.out.println(point.getX()+" "+point.getY()); } }2 以及泛型的构造方法
代码案例如下：
package csdn.zyl.demo; class Con<T>{ private T value; public Con(T value) { this.value = value; } public T getValue() { return value; } public void setValue(T value) { this.value = value; } } public class GenericDemo02 { public static void main(String[] args) { // TODO Auto-generated method stub Con<String> con = new Con<String>("构造方法中使用泛型"); System.out.println(con.getValue()); } }3 设置多个泛型：
package csdn.zyl.demo; /* * 指定多个泛型 */ class Gen<K,T>{ private T take; private K key; public T getTake() { return take; } public void setTake(T take) { this.take = take; } public K getKey() { return key; } public void setKey(K key) { this.key = key; } } public class GenericalDemo04 { public static void main(String[] args) { Gen<String,Integer> gen = new Gen<String,Integer>(); gen.setTake(10); gen.setKey("key"); System.out.println(gen.getTake()+" "+gen.getKey()); } }
案例结果：10 key 4 通配符：
5 泛型接口
