java加法运算 （强制类型转换）

package demo;

public class OutputSum {

    private static final String Int = null;

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int sum=0;
        System.out.println("参数个数："+args.length);
        for (String arg : args) {
            System.out.println(arg);
            sum=sum+Integer.valueOf(arg);
        }
        System.out.println("sum = "+sum);
    }
        
}