5.9-4用字符串生成器给字符串str追加1~10这10个数字

package zfc;

public class ZfcShcq {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        
        StringBuilder str = new StringBuilder("hello world!");
        
        for(int i = 1; i <= 10; i++)
        {
            str.append(i);
        }
        
        System.out.println("字符串str追加后变为："+str);
        
        }

}