大量异常带来性能的影响

感受大量构造异常带来的性能影响：

package com;

/**
 * 异常也会影响性能(在非常高的请求频率下)
 */
public class ExceptionPerformance {

	public static void main(String[] args) {
		
		long t1 = System.currentTimeMillis();
		testParseWithException(100000);
		System.out.println(System.currentTimeMillis() - t1);
		
		
		t1 = System.currentTimeMillis();
		testParse(100000);
		System.out.println(System.currentTimeMillis() - t1);
		
		
	}
	
	
	/**
	 * just: 66 ms
	 */
	private static void testParse(long size){
		for (int i = 0; i < size; i++) {
			parse(i + "");
			parse(i + "");
		}
	}
	
	/**
	 * 1497 ms 
	 */
	private static void testParseWithException(long size){
		for (int i = 0; i < size; i++) {
			parse(i + "%");
			parse(i + "%");
		}
	}

	public static double parse(String data) {
		try {
			return Integer.parseInt(data);
		} catch (Exception e) {
			try {
				return Double.parseDouble(data);
			} catch (Exception e1) {
				try {
					return Integer.parseInt(data.replaceAll("%", ""));
				} catch (Exception e3) {
					return 0;
				}
			}
		}
	}
}