扩展赋值运算符 条件运算符

package operator;
public class Shabi7 {
public static void main(String[] args) {
int a=10;
int b=20;
a+=b;//a =a+b
a-=b;//a =a-b
a*=b;//a =a*b
a/=b;//a =a/b
System.out.println(a);
//字符串连接符 + string字符串相加数字相连
System.out.println(""+a+b);//string字符串相加数字相连
System.out.println(a+b+"");//不变 }}

 

package operator;
//三元运算符
public class Shabi8 {
public static void main(String[] args) {
//x ? y ： z
//如果x==true，则结果为y，否则结果为z
int score=80;
String type =score <60?"不及格":"及格";
System.out.println(type); }}