- 泛型方法，它在修饰符后，返回值类型前增加了类型参数 (<>)
- 类型通配符一般使用问号
?代替具体的类型实参，注意不是类型形参。
代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | package code0507; public class WildCardTest { public static void main(String[] args) { Box<String>name=new Box<String>("hello"); Box<Integer>age=new Box<Integer>(12); Box<Double>number=new Box<Double>(210.50); Box<Integer>point=new Box<Integer>(); getData(name); getData(age); getData(number); point.printpoint(520, 1314); point.printpoint("me", "too"); } public static void getData(Box<?>data){//类型通配符 System.out.println("data:" data.getData()); } } class Box<T>{ private T data; public Box() {}//构造方法重载 public Box(T data) { setData(data); } public T getData() { return data; } public void setData(T data) { this.data = data; } //定义泛型方法 public<T1,T2>void printpoint(T1 x,T2 y){ T1 m=x; T2 n=y; System.out.println("This point is:" m "," n); } } |
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运行结果
1 2 3 4 5 | data:hello data:12 data:210.5 This point is:520,1314 This point is:me,too |
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