Day012

Base

Demo07

public class Demo07 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;

        a+=b; // a = a+b
        a-=b; // a = a-b

        System.out.println(a);


        //字符串连接符  +   , String
        System.out.println(""+a+b);

        System.out.println(a+b+"");


    }
}