[Java] Generic Method

package generic;

public class GenericMethodTest2 {

	
	public static <T> void printArray(T[] array) {
		for(T element : array) {
			System.out.printf("%s ", element);
		}
			
		System.out.println();
	}
	
	public static void main(String[] args) {
		
		// T타입은 객체만 가능하기 때문
		Integer[] iArray = {10,20,30,40,50};
		Double[] dArray = {1.1,1.2,1.3,1.4,1.5};
		Character[] cArray = {'K','O','R','E','A'};
		
		printArray(iArray);
		printArray(dArray);
		printArray(cArray);
		

	}

}​

package generic;

public class GenericMethod {

	public static <T,V> double makeRectangle(Point<T,V> p1, Point<T,V> p2) {
		double left = ((Number)p1.getX()).doubleValue();
		double right = ((Number)p2.getX()).doubleValue();
		double top = ((Number)p1.getY()).doubleValue();
		double bottom = ((Number)p2.getY()).doubleValue();
		
		double width = right - left;
		double height = bottom - top;
		
		return width * height;
	}
	
	
	public static void main(String[] args) {
		Point<Integer, Double> p1 = new Point<>(0,0.0);
		Point<Integer, Double> p2 = new Point<>(10,10.0);
		
		double rect = GenericMethod.<Integer, Double>makeRectangle(p1,p2);
		System.out.println("두 점으로 만들어진 사각형의 넓이는 "+ rect + "입니다.");
		
	}

}