用逗號隔開的String類型字符串轉為int類型的數組 兩種方法的比較 方法二的效率更高

package com.kpzc.test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.lang3.StringUtils;

/** * 用逗號隔開的String類型字符串轉為int類型的數組 兩種方法的比較 方法二的效率更高  * @author kpzc
 *
 */
public class StringToArry {

    /**
     * 生成用逗號隔開的String類型字符串
     * @param num
     * @return
     */
    public static String getStringArry(int num) {
        String s = "";
        for (int i = 0; i < num; i++) {
            s += i + ",";
            if(i==num-1)
                s += i;
        }
        //System.out.println(s);
        return s;
    }

    /**方法一
     * @param ids
     */
    public static void StringToArry1(String ids) {
        Long start = System.currentTimeMillis();

        List<String> sarry = Arrays.asList(StringUtils.split(ids, ","));
        List<Integer> arry = new ArrayList<Integer>();
        for (String term : sarry) {
            arry.add(Integer.parseInt(term));
        }
        Long end = System.currentTimeMillis();
        System.out.println(end - start);
    }

    /**
     * 方法二
     * @param ids
     */
    public static void StringToArry2(String ids) {
        Long start = System.currentTimeMillis();
        String[] sarry = ids.split(",");
        int[] arry = new int[sarry.length];
        for (int i = 0; i < sarry.length; i++) {
            arry[i] = Integer.parseInt(sarry[i]);
        }
        Long end = System.currentTimeMillis();
        System.out.println(end - start);
    }
    
    public static void main(String[] args) {
        getStringArry(1000);
        StringToArry1(getStringArry(1000));
        StringToArry2(getStringArry(1000));
    }
}