赋值运算符

package operator;

public class Demo06 {
public static void main(String[] args) {
int a = 10;
int b = 20;
a+=b;
System.out.println(a);//a=a+b
a-=b;
System.out.println(a);//a=a-b
System.out.println(a+b);
System.out.println(""+a+b);//当出项string类型先拼接
System.out.println(a+b+"");//当字符串出现在后面先计算在拼接

}

}