java常用类-- 包装类

package cn.usts.edu.fly.packingClass;


public class PackingDemo {
    public static void main(String[] args) {
        String a = "123";
        int i = Integer.parseInt(a);// 把string类型转换为int类型
        System.out.println(i+1);
        int b = 456;
        System.out.println(123+String.valueOf(b)+"789");// int转换为字符串
    }

}