用HashMap写一个1-50的圆半径和面积（整数）

package com.xatu.集合;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.junit.Test;

public class Cricle {
	@Test
	public void testCircle(){
		Map<Integer, Integer> c = new HashMap<>();
		for (int i = 0; i < 50; i++) {
			int r = i + 1;
			int s = (int) (r*r*Math.PI);
			c.put(r, s);
		}
		Set<Integer> keys = c.keySet();
		for (Integer key : keys) {
			Integer value = c.get(key);
			System.out.println(key+"--"+value);
		}
	}
}