Demo07

package operator;

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+"");



    }
}