public class GenericAdd{

//泛型方法實現兩個數相加
public <T extends Number> double add(T t1, T t2){
double sum = 0.0;
sum = t1.doubleValue() + t2.doubleValue(); return sum;
}
public static void main(String[] args){
test();
}

public static void test(){
GenericAdd addTest = new GenericAdd();//新建GenericAdd類

int num1 = 3;
int num2 = 4;
System.out.println("整數和:"+addTest.add(num1, num2));//整數相加

float num3 = 3.0f;
float num4 = 7.0f;
System.out.println("浮點數和:"+addTest.add(num3, num4));//浮點數相加

double num5 = 99.0;
double num6 = 1.0;
System.out.println("雙精度浮點數和:"+addTest.add(num5, num6));//雙精度浮點數相加

long num7 = 300;
long num8 = 700;
System.out.println("長整數和:"+addTest.add(num7, num8));//長整數相加
}
}